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Can Anything Travel Faster Than Light?

Video vocabulary

electron

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US / ɪˈlektrɒn /

UK / ɪˈlektrɑ:n /

B2
  • noun
  • A negatively charged particle

only

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US / ˈəunli /

UK / ˈonli /

A1
  • adverb
  • Just one; just that amount or thing; not more than
  • Not very important or serious
  • Just that type of thing, person
  • Short time ago; not before a certain time
  • conjunction
  • Except; but

another

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US / əˈnʌðə(r) /

UK / əˈnʌðɚ /

A1
  • adjecitve
  • One more, but not this
  • determiner
  • One more added
  • pronoun
  • One more (thing)

hey

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US / heɪ /

UK / he /

A1
  • exclamation
  • What you say when you want someone's attention

anything

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US / ˈeniθɪŋ /

UK / ˈɛniˌθɪŋ /

A1
  • pronoun
  • A thing of any kind

diamond

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US / 'daɪəmənd /

UK / ˈdaɪəmənd, ˈdaɪmənd /

A2
  • noun
  • Very hard colorless stone used in jewelry

from

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US / frəm /

UK / frʌm, frɑm,frəm /

A1
  • preposition
  • Starting at a particular place, time or level

infinite

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US / 'ɪnfɪnət /

UK / ˈɪnfənɪt /

B2
  • adjecitve
  • Being very large in amount
  • Without an end; limitless; endless

minus

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US / ˈmaɪnəs /

UK / ˈmaɪnəs /

A2
  • adjecitve
  • Being close to the bottom of a letter grade
  • noun
  • Negative quality; disadvantage
  • Sign that indicates subtraction
  • preposition
  • Being less than zero in number
  • Used when subtracting one number from another
  • verb
  • To take one number away from another; subtract

forty

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US / 'fɔ:tɪ /

UK / ˈfɔrti /

A1
  • number
  • 40

keep

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US / ki:p /

UK / kip /

A1
  • noun
  • Large, strong tower in the middle of a castle
  • Money spent on you so you can live in a place
  • verb
  • To continue doing something; not to stop
  • To stop balls going in a goal in sports
  • To not give back or return something
  • (Of food) to not spoil or not rot
  • To take possession of something to own, e.g. a pet
  • To have and continue to hold something
  • To do something that you have promised or agreed
  • To stay in a certain place or condition
  • To maintain the rules

name

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US / neɪm /

UK / nem /

A1
  • noun
  • What something or someone is called
  • verb
  • To state what someone is called, e.g. John

something

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US / ˈsʌmθɪŋ /

UK / ˈsʌmθɪŋ /

A1
  • adverb
  • In some degree or measure
  • noun
  • a person or thing of some value or consequence
  • pronoun
  • Thing that is not yet known or named
  • Approximately

rest

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US / rest /

UK / rɛst /

A1
  • noun
  • Time when one relaxes, sleeps, or is inactive
  • State in which there is a lack of motion
  • Part of something remaining after some was used
  • verb
  • To stop working or avoid activity to recover
  • (Of dead person) to lie in a grave
  • To lean, support or place something against
  • To not be tired because you had enough sleep

polka

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US / ˈpɒlkə /

UK / ˈpoʊlkə /

C2
  • noun
  • Couples' dance with steps and a hop in fast time

most

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US / məʊst /

UK / most /

A1
  • adverb
  • Very; extremely
  • Greatest possible degree
  • pronoun
  • Nearly all of something

early

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US / ˈɜ:li /

UK / ˈɜ:rli /

A1
  • adjecitve
  • Happening or appearing before
  • adverb
  • Coming/happening before others in a time sequence
  • Happening sooner than expected

chuck

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US / tʃʌk /

UK / tʃʌk /

B2
  • noun
  • Person's name
  • verb
  • To throw carelessly or casually

button

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US / 'bʌtn /

UK / ˈbʌtn /

A2
  • noun
  • Small round piece material used to fasten clothing
  • Switch activated by pressing
  • verb
  • To fasten e.g. a shirt, coat

think

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US / θɪŋk /

UK / θɪŋk /

A1
  • verb
  • To have an idea about something without certainty
  • To have an idea, opinion or belief about something

distance

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US / 'dɪstəns /

UK / ˈdɪstəns /

A2
  • noun
  • Lack of friendliness toward another person
  • Amount of space between two places or things
  • verb
  • To make it clear that you are not involved

come

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US / kʌm /

UK / kʌm /

A1
  • verb
  • To arrive at a place
  • (Of mail) to be delivered
  • To move toward someone; go with someone
  • To reach a certain point or state

any

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US / 'enɪ /

UK / ˈɛni /

A1
  • adjecitve
  • One, or some, no matter which
  • pronoun
  • One (thing) of many; some

aim

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US / eɪm /

UK / em /

A2
  • noun
  • Act of pointing something at a target
  • Purpose or goal
  • verb
  • To point something at a target
  • To intend to get a thing or for a thing to happen

where

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US / hwɛə /

UK / hwɛr, wɛr /

A1
  • conjunction
  • At or in the place which
  • In whatever place
  • pronoun
  • Word you use to ask the location of something

radiation

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US / ˌreɪdiˈeɪʃn /

UK / ˌrediˈeʃən /

B1
  • noun
  • Energy transmitted as rays, waves or particles
  • Process of emitting something in waves
  • Harmful waves of energy from nuclear activity

madness

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US / ˈmædnəs /

UK / ˈmædnɪs /

A2
  • noun
  • Obsolete term for legal insanity

cross

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US / krɒs /

UK / krɔs, krɑs /

A2
  • adjecitve
  • Angry and upset
  • From one side of something to the other
  • noun
  • (Of animals) mixture of breeds in one animal
  • Person's name
  • verb
  • To put one thing over another e.g. arms
  • To breed one type of animal or plant with another
  • To not to agree with someone; oppose
  • To go from one side of something to the other
  • To meet at one point

call

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US / kɔ:l /

UK / kɔl /

A1
  • noun
  • A order or request for action
  • The sound an animal makes, often when in danger
  • A correct prediction, e.g. a decision in a game
  • A short visit to a place or person
  • A decision by a referee or umpire in a game
  • verb
  • To make a request or order for action
  • (Animal) to make sounds to warn of danger
  • To announce the date of an election
  • To make a judgment about something
  • To give someone or something a name
  • To guess in advance the result or outcome
  • To visit a place or person for a short time
  • To phone someone
  • To speak, announce or shout in a loud voice

until

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US / ənˈtɪl /

UK / ʌnˈtɪl /

A1
  • conjunction
  • Up to; to a time when something happens
  • preposition
  • Before (a specific time)

lot

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US / lɒt /

UK / lɑt /

A1
  • noun
  • What happens to a person in life from chance; fate
  • A group of people seen together
  • Item for sale at an auction
  • Small area of land used for a purpose e.g. parking

galaxy

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US / 'ɡæləksɪ /

UK / ˈɡæləksi /

B2
  • noun
  • A group of stars and planets in space

back

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US / bæk /

UK / bæk /

A1
  • adjecitve
  • Farthest from the front e.g. in a classroom
  • adverb
  • Have returned to a place you were before
  • noun
  • The part of a chair that the upper body leans upon
  • Location at the rear of something
  • The reverse of side something
  • Area on the rear of your body
  • verb
  • To bet money on something
  • To go backwards in a car
  • To support and encourage someone or some cause

countless

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US / ˈkaʊntləs /

UK / ˈkaʊntlɪs /

B1
  • adjecitve
  • Being too many to be numbered or imagined

exactly

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US / ɪgˈzæktli /

UK / ɪɡˈzæktli /

A1
  • adverb
  • No more and no less than; precisely

try

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US / traɪ /

UK / traɪ /

A1
  • noun
  • Act of putting the ball over the rugby goal line
  • verb
  • To make an effort, to attempt to do something
  • To examine someone or something in a court of law
  • To test to see if it is good or you like it
  • To make a person go through hardship; test
  • To examine something to see if it works

here

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US / hɪə(r) /

UK / hɪr /

A1
  • adverb
  • In this place; at this location, position or time

underwater

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US / ˌʌndəˈwɔ:tə(r) /

UK / ˈʌndɚˌwɔtɚ, -ˌwɑtɚ /

C2
  • adjecitve
  • (Moving or existing) beneath the surface of water

scare

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US / skeə(r) /

UK / sker /

A1
  • noun
  • Act of making some feel frightened
  • Something causing people to be afraid
  • verb
  • To become frightened
  • To make someone feel frightened or worried

gravity

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US / ˈgrævəti /

UK / ˈɡrævɪti /

B1
  • noun
  • (Of a situation) extreme seriousness
  • Force making things fall towards the ground

four

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US / fɔ:(r) /

UK / fɔr, for /

A1
  • number
  • 4

contain

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US / kənˈteɪn /

UK / kənˈten /

A2
  • verb
  • To keep something from spreading
  • To hold something inside something else

someone

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US / ˈsʌmwʌn /

UK / ˈsʌmˌwʌn, -wən /

A1
  • pronoun
  • Person who is not known or named

particle

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US / ˈpɑ:tɪkl /

UK / ˈpɑrtɪkəl /

B1
  • noun
  • Adverb or preposition that joins with a verb
  • Tiny piece or quantity of something

side

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US / saɪd /

UK / saɪd /

A1
  • adjecitve
  • In addition to the central or most important thing
  • Next to, or very close to, the right or left of
  • noun
  • Position or opinion that is opposite to another
  • Right or left part of a person's body
  • Feature of someone's personality
  • Straight edge of an object
  • One of two or more groups fighting each other
  • verb
  • To decide to agree with one point, not the other

plus

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US / plʌs /

UK / plʌs /

A2
  • noun
  • A benefit or advantage
  • preposition
  • In addition; add
  • In addition to; Indicates a number above
  • Having a value greater than zero

will

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US / wɪl /

UK / wɪl /

A1
  • noun
  • Desire or choice of someone
  • Document saying who gets your money when you die
  • Strong desire to do something; determination
  • Desire to do something; strong wish to do
  • other
  • Used with verbs to express the future
  • verb
  • To leave property to someone after your death
  • To use mental effort to make something happen
  • Am (is, are) likely to do
  • To influence someone to do something
  • To make something happen by strongly wanting it

thousand

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US / ˈθaʊznd /

UK / ˈθaʊzənd /

A1
  • number
  • Number 1,000

rim

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US / rɪm /

UK / rɪm /

B2
  • noun
  • Outer edge of something circular
  • Outer part of a wheel of a vehicle
  • verb
  • To give something an outer edge, as specified

itself

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US / ɪtˈself /

UK / ɪtˈsɛlf /

A1
  • pronoun
  • Referring to it

already

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US / ɔ:lˈredi /

UK / ɔlˈrɛdi /

A1
  • adverb
  • Having happened or been done before this time

voyager

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US / ˈvɔɪɪdʒə(r) /

UK / ˈvɔɪɪdʒɚ /

B1
  • noun
  • Traveler to a distant land (especially by sea)

sure

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US / ʃʊə(r) /

UK / ʃʊr /

A1
  • adjecitve
  • Having no doubts about something
  • Have confidence in your own words or actions
  • Firmly established or held; being firm or stable
  • Being correct or true
  • adverb
  • What you say to agree willingly

point

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US / pɔɪnt /

UK / pɔɪnt /

A1
  • noun
  • An item to be discussed
  • Small spot or dot
  • Fact or detail
  • Feature of something
  • The size of the text on a page or screen
  • A certain time or stage in a process
  • Certain position in time or space
  • Idea or fact you try to convince people about
  • Measurement of scores in a game, sport
  • Sharp end of something, e.g. a pen or pin
  • verb
  • To face a certain direction, e.g. north
  • To indicate something with your finger to others

ever

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US / 'evə(r) /

UK / ˈɛvɚ /

A1
  • adverb
  • At any time; at all times in the future

day

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US / deɪ /

UK / de /

A1
  • noun
  • A period of 24 hours beginning at midnight
  • The period of time when it is light outside
  • Person's name

snap

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US / snæp /

UK / snæp /

B1
  • noun
  • An informal word for a photograph
  • verb
  • To close your mouth quickly like biting something
  • To break something dry and thin, e.g. a branch
  • To lose control of your emotions; get angry

nice

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US / naɪs /

UK / naɪs /

A1
  • adjecitve
  • Being attractive or of high quality or value
  • Good or enjoyable
  • Being kind or friendly

look

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US / lʊk /

UK / lʊk /

A1
  • noun
  • Person's beauty or physical attractiveness
  • Particular style of dress, clothes, or appearance
  • The way someone, something appears to be
  • Act of searching for or examining something
  • verb
  • To appear to be; seem

general

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US / 'dʒenrəl /

UK / ˈdʒɛnərəl /

A1
  • adjecitve
  • Widespread, normal or usual
  • noun
  • Top ranked officer in the army

wormhole

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US / ˈwɜ:mhəʊl /

UK / ˈwɜ:rmhoʊl /

A1
  • noun
  • Hole made by a burrowing worm

very

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US / 'verɪ /

UK / ˈvɛri /

A1
  • adjecitve
  • Concerning a large degree or amount
  • adverb
  • A lot; much; many
  • Used to stress or emphasize a noun

they

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US / ðeɪ /

UK / ðe /

A1
  • pronoun
  • Two or more people, animals, or things

everything

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US / 'evrɪθɪŋ /

UK / ˈɛvriˌθɪŋ /

A1
  • pronoun
  • All of the things mentioned

curve

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US / kə:v /

UK / kɚv /

A2
  • noun
  • Smooth rounded line that is not straight
  • verb
  • To make something bend into a rounded shape

between

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US / bɪˈtwi:n /

UK / bɪˈtwin /

A1
  • preposition
  • From one person, thing, or place, to another
  • In the space that separates two objects
  • Among two or more people who share something

work

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US / wɜ:k /

UK / wɚk /

A1
  • adjecitve
  • Activity completed in order to make money
  • noun
  • The product of some artistic or literary endeavor
  • Everything created by an author, artist, musician
  • Activity you do in order to make money
  • Place of employment
  • Final product or result of a some labor or effort
  • verb
  • To bring into a specific state of success
  • To be functioning properly, e.g. a car
  • To do your job in your company or workplace
  • To make an effort to do something
  • To operate a machine or device

shockwave

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US / ˈʃɑˌkweɪv /

UK / /

C2
  • noun
  • A wave of energy (e.g. after an earthquake)

take

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US / teɪk /

UK / tek /

A1
  • noun
  • Filming of a single scene for TV or the movies
  • verb
  • To accept something that is offered
  • To use a method of traveling, e.g. a bus or train
  • To use a camera to make (a photo)
  • To pick up something and go away with it
  • To study a subject in school
  • To attempt to pass (an exam)
  • To require a certain amount of time, money, space

show

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US / ʃəʊ /

UK / ʃo /

A1
  • noun
  • False display of love, emotion or action
  • An event for displaying or promoting goods
  • Play, opera or theater production
  • Presentation that is broadcast on TV or radio
  • verb
  • To be easily seen or displayed
  • To display your emotions or feelings
  • To let someone see something; display
  • To explain or teach how something is done
  • To lead someone somewhere; point them to something
  • To prove something to be true, correct
  • To reveal or allow something to be seen

travel

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US / ˈtrævl /

UK / ˈtrævəl /

A1
  • noun
  • Going to other places, esp. distant places
  • verb
  • To go to a place that is far away

theory

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US / ˈθiəri /

UK / ˈθiəri, ˈθɪri /

A2
  • noun
  • Ideas or principles that explain facts or events

simple

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US / 'sɪmpl /

UK / ˈsɪmpəl /

A1
  • adjecitve
  • Not hard to understand or do; not complex
  • Having only a few parts; not complex
  • Being ordinary or normal
  • Being plain; without a lot added for style

space

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US / speɪs /

UK / spes /

A1
  • noun
  • Empty area kept for a specific reason, like a car
  • Empty area with nothing in it
  • Area in the sky where the stars are
  • Area between written words on a page
  • verb
  • To make a certain distance or time between

approach

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US / ə'prəʊtʃ /

UK / əˈprəʊtʃ /

A2
  • noun
  • Means of reaching a place, often a road or path
  • Request of someone with a specific goal in mind
  • Specific way to handle a project, task, problem
  • verb
  • To get close to reaching something or somewhere
  • To request someone to do something specific

violation

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US / ˌvaɪə'leɪʃn /

UK / ˌvaɪəˈleʃən /

B1
  • noun
  • Abuse, damage or total disregard
  • Act of failing to obey a rule or law

who

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US / hu: /

UK / hu /

A1
  • pronoun
  • Which person
  • Used to introduce information about people

engine

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US / 'endʒɪn /

UK / ˈɛndʒɪn /

A2
  • noun
  • Machine that changes energy into mechanical motion
  • The part of a train that pulls railway cars

empty

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US / 'emptɪ /

UK / ˈɛmpti /

A1
  • adjecitve
  • Containing nothing; with no contents
  • Without emotions, feelings, meaning or force
  • noun
  • Item, e.g. a bottle, whose contents have been used
  • verb
  • To remove the contents from something

fast

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US / fɑ:st /

UK / fæst /

A1
  • adjecitve
  • In a way that is difficult to move or change
  • Moving or able to move quickly
  • Showing time that is later than the actual time
  • adverb
  • With a great deal of speed
  • noun
  • Period of time when a person chooses not to eat
  • verb
  • To refuse food for a long time

relativity

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US / ˌreləˈtɪvəti /

UK / ˌrɛləˈtɪvɪti /

C2
  • noun
  • Einstein theory about time, space and position

speed

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US / spi:d /

UK / spid /

A2
  • noun
  • How fast or slow something is or is done
  • verb
  • To move quickly when completing an action
  • To drive a vehicle faster than laws allow

solar

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US / 'səʊlə(r) /

UK / ˈsolɚ /

B1
  • adjecitve
  • Concerning the sun, or its heat

pretty

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US / 'prɪtɪ /

UK / ˈprɪti /

A1
  • adjecitve
  • Being attractive to the eye in a simple way
  • adverb
  • Very; to a great degree

length

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US / leŋθ /

UK / leŋθ /

A2
  • noun
  • Distance from one end of a pool to the other
  • Measurement of distance or of time

dense

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US / dens /

UK / dɛns /

B1
  • adjecitve
  • Very thick and difficult to see, get through
  • Hard to understand
  • Uncomprehending; foolish; inconsiderate

experimentally

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US / ɪkˌsperɪ'mentəlɪ /

UK / ɪkˌspɛrəˈmɛntl /

B1
  • adverb
  • In an experimental fashion

way

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US / weɪ /

UK / we /

A1
  • adverb
  • Used to emphasize the amount of something
  • noun
  • Particular aspect of something being thought about
  • One of various choices that could be made
  • Particular existing condition or state
  • (Often long) distance or length of time
  • How something is done
  • Route to go to a place
  • Small street
  • Usual behavior, emotions or habits of someone

yes

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US / jes /

UK / jɛs /

A1
  • adverb
  • Way to say you agree or will do something

theoretically

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US / ˌθɪə'retɪklɪ /

UK / ˌθiəˈretɪkli /

B2
  • adverb
  • As regards ideas that could be true

poetic

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US / pəʊˈetɪk /

UK / poˈɛtɪk /

B1
  • adjecitve
  • Imaginative, descriptive and often emotional

move

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US / mu:v /

UK / muv /

A1
  • noun
  • Act of moving a playing piece in chess, etc.
  • An action; doing something
  • Step taken to achieve a goal
  • verb
  • To cause someone to have certain emotions
  • To cause something to change to a different place
  • To change where people live or a business operates
  • To take action to do or achieve something

direction

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US / də'rekʃn /

UK / dɪˈrɛkʃən, daɪ- /

A2
  • noun
  • When someone tells people what to do
  • Describes the way you are going, e.g. North

ago

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US / əˈgəʊ /

UK / əˈgoʊ /

A1
  • adverb
  • At a specified length of time in the past

hundred

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US / 'hʌndrəd /

UK / ˈhʌndrɪd /

A1
  • number
  • 100

month

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US / mʌnθ /

UK / mʌnθ /

A1
  • noun
  • One of 12 28-31 day periods in the year

float

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US / fləʊt /

UK / floʊt /

B1
  • noun
  • Object designed to stay on the surface of water
  • Decorated truck used in a festival
  • verb
  • To sell the shares of a company publicly
  • To move slowly and easily through air
  • To rest on the surface of water without sinking

next

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US / nekst /

UK / nɛkst /

A1
  • adverb
  • The one that follows another in time or order
  • At a time or place directly after the present one
  • noun
  • The one that follows after
  • adjecitve
  • Immediately after the previous one
  • First occurrence after the present one

blow

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US / bləʊ /

UK / blo /

A2
  • noun
  • Something that causes you difficulty or sadness
  • Act of making air come out of your mouth
  • A hit or strike from an object
  • verb
  • To move something using air
  • To make air come quickly out of your mouth
  • To clear something by forcing air through it

sixty

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US / 'sɪkstɪ /

UK / ˈsɪksti /

A1
  • number
  • 60

propulsion

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US / prəˈpʌlʃn /

UK / prəˈpʌlʃən /

C1
  • noun
  • Forward movement often under power

have

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US / həv /

UK / hæv /

A1
  • verb
  • To drink, smoke, eat or use something
  • To experience the effects of something
  • To organize an event, or join in an activity
  • To own, possess, or hold something
  • To cause to happen or produce a particular effect

flash

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US / flæʃ /

UK / flæʃ /

B1
  • noun
  • Sudden and brief appearance of something
  • Light used by a camera to brighten the area
  • Sudden feeling, idea or occurrence
  • Publicly exposing your genitals to others
  • Sudden bright light
  • Showing something very quickly and briefly
  • Light used in the dark, powered by batteries
  • verb
  • To appear suddenly and briefly
  • To publicly expose your genitals to others
  • To shine brightly very suddenly and briefly
  • To show something very quickly and briefly

fall

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US / fɔ:l /

UK / fɔl /

A1
  • noun
  • Season after summer and before winter; Autumn
  • A drop in amount; decrease
  • Dropping from a standing position to the ground
  • verb
  • To drop in amount; to decrease
  • To come down from a higher position suddenly
  • To go from standing to the ground, by accident

exist

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US / ɪɡ'zɪst /

UK / ɪɡˈzɪst /

A1
  • verb
  • To be present, alive or real

insane

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US / ɪnˈseɪn /

UK / ɪnˈsen /

B2
  • adjecitve
  • Mentally ill; crazy
  • Being mentally disturbed
  • Being crazy or stupid

know

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US / nəʊ /

UK / noʊ /

A1
  • verb
  • To be familiar with a person or place, thing
  • To feel sure or be convinced about something
  • To discover or be aware of something
  • To be able to distinguish
  • To have knowledge of things

could

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US / kəd /

UK / kʊd /

A1
  • other
  • Past form of 'can' to mean have ability
  • Used to ask for something politely, or to offer

sun

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US / sʌn /

UK / sʌn /

A1
  • noun
  • Light and heat coming from a large star in the sky
  • Hot shining star the Earth moves around
  • verb
  • To lie in the sunshine and enjoy its warmth

increase

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US / ɪn'kri:s /

UK / ɪnˈkris /

A1
  • noun
  • Fact of increasing; amount something grows by
  • verb
  • To make or become larger in size or amount

decade

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US / ˈdekeɪd /

UK / ˈdɛkˌed, dɛˈked /

B1
  • noun
  • Period of 10 years

air

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US / eə(r) /

UK / er /

A1
  • noun
  • Mixture of gases around the earth that we breathe
  • A person's manner intended to impress others
  • verb
  • To expose to the outside, to dry or freshen
  • To broadcast a TV or radio show
  • To open a subject to discussion and debate

low

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US / ləʊ /

UK / lo /

A1
  • adjecitve
  • Having a small quantity, supply, or amount
  • Being unhappy or unpleasant in attitude
  • Not high; being near the ground, or bottom
  • (Of a voice, sound) being soft; quiet
  • noun
  • Situation of not having a lot of something

with

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US / wɪð /

UK / wɪð, wɪθ /

A1
  • preposition
  • As an employee of a certain company
  • Against something or someone
  • By using something as a means
  • Due to; because of
  • Including
  • Possessing as a feature
  • Related to
  • (Of the manner/attitude by which you do something)
  • Used to express that people or things are together

upon

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US / əˈpɔn, əpən /

UK / əˈpɑn, əˈpɔn /

A1
  • preposition
  • More formal term for 'on'

trek

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US / trek /

UK / trɛk /

B1
  • noun
  • Slow or difficult journey
  • verb
  • To make your way slowly and painfully
  • To go on a difficult (often walking) journey

percent

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US / pə'sent /

UK / pɚˈsɛnt /

A2
  • adverb
  • One one-hundredth of a whole; the symbol %

accelerate

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US / əkˈseləreɪt /

UK / ækˈsɛləˌret /

B1
  • verb
  • To cause to occur earlier than expected
  • To increase the speed or rate of something

watch

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US / wɒtʃ /

UK / wɑtʃ /

A1
  • noun
  • Period of time someone is responsible for guarding
  • Device you wear on your wrist that shows the time
  • Official warning statement, e.g. of bad weather
  • verb
  • To keep in check, manage, or control something
  • To look at something for entertainment, e.g. TV
  • To guard a place or people; protect child, etc.
  • To look at carefully to work out what is happening
  • To protect and care for someone or something

mix

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US / mɪks /

UK / mɪks /

A2
  • noun
  • A combination of more than two things
  • verb
  • To combine two or more things to make one
  • To meet and get along with others, e.g. at a party

energy

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US / 'enədʒɪ /

UK / ˈɛnədʒi /

A2
  • noun
  • Physical or mental strength

find

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US / faɪnd /

UK / faɪnd /

A1
  • noun
  • Object discovered by chance
  • Things that have been discovered from searching
  • verb
  • To become aware of something that is happening
  • To discover or meet by chance
  • To decide if someone is guilty of a crime, or not
  • To learn through study, research, or effort
  • To discover something by looking for it

dematerialize

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US / ˌdiːməˈtɪəriəlaɪz /

UK / ˌdiːməˈtɪərɪəlaɪz /

A1
  • verb
  • Become immaterial; disappear

expand

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US / ɪk'spænd /

UK / ɪkˈspænd /

A2
  • verb
  • To make something larger in size, number, amount

exceed

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US / ɪk'si:d /

UK / ɪkˈsid /

B1
  • verb
  • To be greater in number, degree than something
  • To go above or beyond a limit or rule

bend

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US / bend /

UK / bɛnd /

A2
  • noun
  • When a road changes direction; turn
  • verb
  • To become curved or no longer straight
  • To move your body so that it is not straight up
  • To turn in a different direction, as a road
  • To use force to make an object not straight

case

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US / keɪs /

UK / kes /

A1
  • noun
  • Container used to carry things, e.g. clothes
  • Set of facts about a crime
  • Set of facts about an event
  • Example or instance of something
  • verb
  • To find out about a place, as in planning to steal

boundary

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US / 'baʊndrɪ /

UK / ˈbaʊndəri, -dri /

B1
  • noun
  • A division or border to separate two areas

what

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US / wɒt /

UK / hwɑt, hwʌt, wɔt, wʌt,hwət, wət /

A1
  • pronoun
  • Thing or things that; the same kind as
  • Used to emphasize something you are about to say
  • adjecitve
  • Used to refer to a particular amount, or number
  • Used to place emphasis on a particular quality
  • adverb
  • To a certain degree
  • determiner
  • Question words used for asking for information
  • exclamation
  • Used to express excitement, shock, or surprise
  • Used to ask people to repeat something they said

reaction

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US / rɪ'ækʃn /

UK / riˈækʃən /

A2
  • noun
  • Bodily response to a drug or something eaten
  • Feeling or action in response to something

sit

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US / sɪt /

UK / sɪt /

A1
  • verb
  • To take an exam
  • To be in a resting position on a chair
  • To provide seating for people
  • To remain in a still position while being painted

people

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US / 'pi:pl /

UK / ˈpipəl /

A1
  • noun
  • Persons sharing culture, country, background, etc.
  • Men, Women, Children

like

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US / laɪk /

UK / laɪk /

A1
  • adjecitve
  • Being equal in status or kind to something else
  • Similar; the same
  • adverb
  • For example
  • preposition
  • Used as a filler; used to ad emphasis
  • In a way similar to the way something is done
  • Such as; for example
  • verb
  • To want to
  • To find something pleasing; to prefer something

even

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US / 'i:vn /

UK / ˈivən /

A1
  • adjecitve
  • Being equal in influence, power, possibility etc.
  • Being divided equally or fairly
  • (Of teams/contest) with similar chances of success
  • Smooth, level, or regular
  • Can be divided by 2; ending in 2, 4, 6, 8, or 0
  • At a regular, equally steady manner
  • Remaining steady and unchanging
  • adverb
  • (When this is surprising) as well; too
  • (Used to compare two things/stress the difference)
  • verb
  • To make something level; to flatten
  • To make something equal

care

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US / keə(r) /

UK / kɛr /

A1
  • noun
  • Treatment you receive for your health or safety
  • Something that a person worries about
  • verb
  • To feel interest, concern, or worry
  • To look after someone or something

about

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US / ə'baʊt /

UK / əˈbaʊt /

A1
  • adverb
  • To be ready to; going to
  • Nearly; approximately; roughly
  • Near; next to; close to
  • In every direction; in the area of
  • preposition
  • Concerning or of (a topic)

again

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US / ə'ɡen /

UK / əˈɡɛn /

A1
  • adverb
  • One more time, once more

step

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US / step /

UK / stɛp /

A1
  • noun
  • Movement done as part of a particular dance
  • Distance covered by one movement of a leg; stride
  • One part or stage in a process
  • Sound made by the feet while walking; footstep
  • Flat horizontal piece that forms stairs
  • verb
  • To raise and moving the foot to put it down

suppose

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US / sə'pəʊz /

UK / səˈpoʊz /

A2
  • conjunction
  • What if
  • verb
  • To imagine or guess what might happen

then

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US / ðen /

UK / ðɛn /

A1
  • adverb
  • A time that is not now
  • Following another thing in time or arrangement
  • Following on reasonably from what was just stated
  • At that time, not now

instantly

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US / ˈɪnstəntli /

UK / ˈɪnstəntli /

A2
  • adverb
  • In a manner without delay; immediately

glass

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US / ɡlɑ:s /

UK / ɡlæs /

A1
  • adjecitve
  • Being made of glass
  • noun
  • Clear hard container used for drinking
  • A lens for eyewear
  • Hard see-through material used for making windows

down

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US / daʊn /

UK / daʊn /

A1
  • adjecitve
  • Being sad, sick, or unhappy
  • Not operating, working, or functioning as expected
  • adverb
  • In a sitting or lying position
  • Towards or on the ground, floor, or bottom
  • Written or copied onto a piece of paper or book
  • noun
  • A period of play in American Football
  • The soft, smooth hairs that cover a bird's body
  • preposition
  • Along something's path, course, or direction
  • Going from a higher position to a lower position
  • verb
  • To eat or drink very quickly and without stopping

yeah

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US / jeə /

UK / ˈjɛə, ˈjæə, jɛ- /

A1
  • exclamation
  • Another way of saying 'yes'

happen

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US / 'hæpən /

UK / ˈhæpən /

A1
  • verb
  • To take place or occur

alpha

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US / ˈælfə /

UK / 'ælfə /

B1
  • adjecitve
  • Most powerful (animals of the same sex)
  • noun
  • First letter in the Greek alphabet

right

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US / raɪt /

UK / raɪt /

A1
  • adjecitve
  • Correct or true
  • The south side of you looking at the rising sun
  • adverb
  • Exactly in a place or time
  • Being appropriate for a particular event
  • In a straight or direct manner
  • noun
  • Something you are legally or morally allowed to do
  • Ideal of what is just and good
  • Political view based on conservatism
  • verb
  • To fix something previously wrong or unjust
  • To make upright, as a boat that has turned over

fun

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US / fʌn /

UK / fʌn /

A1
  • adjecitve
  • Amusing and enjoyable
  • noun
  • Enjoyable or amusing quality or feeling

poorly

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US / ˈpʊəli: /

UK / ˈpʊrli /

A1
  • adjecitve
  • Slightly ill; unwell
  • adverb
  • Badly; not enough; not sufficient

medium

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US / 'mi:dɪəm /

UK / ˈmidiəm /

A2
  • noun
  • Method of expressing ideas or feelings
  • Something available in a middle size or condition
  • Person who claims to communicate with the dead

get

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US / ɡet /

UK / ɡɛt /

A1
  • verb
  • To become affected by illness or disease
  • To begin to feel or understand an emotion or idea
  • To send or bring someone or something home, etc.
  • To go somewhere to obtain something
  • To (cause to) do a particular thing
  • To obtain, receive or be given something
  • To currently have
  • To prepare for use
  • To understand something being said or read

number

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US / ˈnʌmbə(r) /

UK / ˈnʌmbɚ /

A1
  • noun
  • Symbols such as 1, 2, 56, 793
  • Particular song or dance performed during a show
  • Total quantity or amount of things
  • verb
  • To put numbers on things
  • To assign a sequence within a group, series, set
  • To claim to be part of a larger group, series, set

nothing

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US / 'nʌθɪŋ /

UK / ˈnʌθɪŋ /

A1
  • noun
  • Item of little or no value, importance, interest
  • Number or value of zero
  • pronoun
  • Not anything, not a single thing

hit

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US / hɪt /

UK / hɪt /

A1
  • noun
  • A planned killing, usually for money
  • Song, movie etc. that is successful
  • When someone strikes someone or something
  • Time when a player makes contact with the ball
  • Time when a website is accessed
  • verb
  • To have a negative impact on a person/place/thing
  • To press something, such as a button or switch
  • To suddenly realize the importance of something
  • To move your hand, a bat, etc. against with force
  • To fight, attack or damage something or someone
  • To arrive at a specific place, level, or goal
  • To make contact with the ball in a game or sport

interesting

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US / ˈɪntrəstɪŋ /

UK / ˈɪntrɪstɪŋ, -tərɪstɪŋ, -təˌrɛstɪŋ /

A1
  • adjecitve
  • Taking your attention; making you want to know
  • verb
  • To make someone want to know about something
  • To persuade to do, become involved with something

similar

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US / ˈsɪmələ(r) /

UK / ˈsɪməlɚ /

A1
  • adjecitve
  • Nearly the same; alike

three

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US / θri: /

UK / θri /

A1
  • number
  • Number 3

proxima

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US / /

UK / /

A1
  • other
  • Nearest star to the sun; distance: . light years

disintegrate

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US / dɪs'ɪntɪɡreɪt /

UK / dɪsˈɪntɪˌɡret /

B2
  • verb
  • To cause something to break into very small pieces

bad

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US / bæd /

UK / bæd /

A1
  • adjecitve
  • Not good; wrong
  • Lacking in good morals; evil
  • No longer fresh; spoiled

wish

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US / wɪʃ /

UK / wɪʃ /

A1
  • noun
  • Expression of a hope for something in the future
  • verb
  • To want something to happen or to become true

specific

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US / spəˈsɪfɪk /

UK / spɪˈsɪfɪk /

A2
  • adjecitve
  • Precise; particular; just about that thing
  • Concerning one particular thing or kind of thing

less

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US / les /

UK / lɛs /

A1
  • adjecitve
  • Smaller in amount or degree
  • adverb
  • To a smaller degree
  • noun
  • A smaller amount
  • preposition
  • With the subtraction of

band

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US / bænd /

UK / bænd /

A1
  • noun
  • Group of people who work together e.g. play music
  • Thin piece of material that wraps around something
  • verb
  • To come together to work on a project
  • To tie things together using string or rope

word

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US / wɜ:d /

UK / wɚd /

A1
  • noun
  • Unit of language that has a meaning
  • Promise
  • Short remark or piece of information
  • verb
  • To express something by choosing particular words

this

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US / ðɪs /

UK / ðɪs /

A1
  • adjecitve
  • Used to indicate something already been discussed
  • Used to indicate something happening around now
  • adverb
  • An indication by a physical motion or gesture
  • A specific amount of
  • determiner
  • Person, thing, or idea near you
  • pronoun
  • Person, thing that has already been discussed

may

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US / meɪ /

UK / me /

A1
  • noun
  • 5th month of the year
  • other
  • Used to express a desire
  • Expresses permission, possibility or probability
  • Used to show that a thing could be true

ionize

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US / ˈaɪənaɪz /

UK / ˈaɪənaɪz /

A1
  • verb
  • To cause something to become an ion by adding or removing electrons

arm

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US / ɑ:m /

UK / ɑrm /

A1
  • noun
  • Part of your body from your shoulder to your hand
  • A branch of another object e.g. company
  • The side part of a chair where your arms go
  • The influence or power an authority has
  • verb
  • To activate a weapon or bomb for use
  • To give a gun or other weapon to a person or group

universe

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US / ˈju:nɪvɜ:s /

UK / ˈjunəˌvɚs /

B2
  • noun
  • All of space that contains planets and stars
  • Things surrounding a person, affecting their life

run

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US / rʌn /

UK / rʌn /

A1
  • noun
  • Journey between two places made by ship or car
  • Series of similar things or successes and failures
  • Act of running; exercise of running
  • verb
  • To depart or travel according to a schedule
  • To cause an animal to move in a certain direction
  • (Of an engine) to be operating
  • To start or use a computer program
  • To flow in a certain direction, like a liquid
  • To manage or operate a business
  • To operate or drive something
  • (Of a road) to go from one place to another
  • To move your legs faster than walking

make

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US / meɪk /

UK / mek /

A1
  • noun
  • Product made by a particular company; brand
  • verb
  • To arrange or prepare something e.g. dinner
  • To get to (a place) on time
  • To gain the status of (teacher, lawyer, etc.)
  • To create something by putting things together
  • To earn a certain amount of money at a job
  • To cause or force a person to do something
  • To cause something to happen or be formed

body

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US / ˈbɒd.i /

UK / ˈbɑdi /

A1
  • noun
  • An object distinct from other objects
  • A group of people involved in an activity together
  • Main part of something
  • A person's physical self

turn

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US / tɜ:n /

UK / tɚn /

A1
  • noun
  • Place where changing of direction happens
  • Your time or chance to perform a duty
  • Your chance to play or do in say a game
  • Unexpected change, as in the weather
  • verb
  • To become (a particular age)
  • To become a different quality, color, etc.
  • To change the direction of something, e.g. a car
  • To move in an opposite direction or position
  • To shape metal with a spinning tool

than

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US / ðən /

UK / ðən /

A1
  • conjunction
  • Used to compare two things that are not equal

open

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US / 'əʊpən /

UK / ˈopən /

A1
  • adjecitve
  • Available for use; accessible
  • Not being hidden; available for others to see
  • Being available for customers to enter or use
  • Allowing everyone to use or take part in
  • Not secret anymore
  • Not closed or shut
  • Willing to accept new ideas and thoughts
  • noun
  • Name for a tennis or golf competition
  • verb
  • To make accessible or able to be used, e.g. road
  • To start the activities or services of a business
  • To make a space or hole appear in something
  • To move or change so that it is no longer closed
  • To start something, e.g. a new business

one

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US / wʌn /

UK / wʌn /

A1
  • pronoun
  • You; we; people in general; someone
  • The thing or person previously referred to
  • adjecitve
  • Used to refer to people generally
  • Being a strong example of (something mentioned)
  • number
  • Number 1

other

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US / 'ʌðə(r) /

UK / ˈʌðər /

A1
  • adjecitve
  • A thing different from that mentioned
  • determiner
  • (Something) else; not the first (one)
  • pronoun
  • Being the one and only thing of that category

into

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US / 'ɪntə /

UK / ˈɪntu /

A1
  • preposition
  • Moving or going inside something
  • In the same direction as; in the direction of
  • So as to become; taking the state of

explainer

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US / ɪksp'leɪnə /

UK / ɪksp'leɪnə /

A1
  • noun
  • Someone giving reasons or details about something

wow

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US / waʊ /

UK / waʊ /

A1
  • exclamation
  • Sound people make when they make are impressed
  • verb
  • (Informal) to greatly impress someone

rocket

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US / 'rɒkɪt /

UK / ˈrɑkɪt /

B1
  • noun
  • Powerful engine that releases hot gases
  • Dark green, hot-tasting salad leaf
  • Weapon shaped like a long tube carrying bombs
  • Vehicle transporting people or things into space
  • verb
  • To travel, increase, or rise very quickly

transporter

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US / trænˈspɔ:tə(r) /

UK / trænˈspɔ:rtə(r) /

B1
  • noun
  • Vehicle used for moving other vehicles

stretch

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US / stretʃ /

UK / strɛtʃ /

A2
  • noun
  • Making arm, leg muscles longer to ease them
  • A consecutive row of things
  • A period of time
  • verb
  • To make your arm, leg muscles long to ease them
  • To make something bigger by pulling on it

material

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US / məˈtɪəriəl /

UK / məˈtɪriəl /

A2
  • adjecitve
  • Relevant; (of evidence) important or significant
  • Belonging to the world of physical things
  • noun
  • Cloth; fabric
  • Supplies or data needed to do a certain thing
  • Substance from which a thing is made of

emit

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US / ɪ'mɪt /

UK / ɪˈmɪt /

B1
  • verb
  • To release or send out (a gas, etc.)

physical

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US / ˈfɪzɪkl /

UK / ˈfɪzɪkəl /

A2
  • adjecitve
  • Concerning the body of a person
  • Concerning things that can be seen or touched
  • noun
  • Health check at the doctors' or hospital

year

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US / jə: /

UK / jɪr /

A1
  • noun
  • Unit of time equal to 12 months or 365 or 366 days
  • Used to refer to the age of a person

how

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US / haʊ /

UK / haʊ /

A1
  • adjecitve
  • To what degree? in what amount?
  • adverb
  • (Used to explain the way to do something)
  • exclamation
  • For what purpose or reason?
  • (Used to ask someone or something's condition)

kind

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US / kaɪnd /

UK / kaɪnd /

A1
  • adjecitve
  • In a caring and helpful manner
  • friendly and considerate
  • noun
  • One type of thing

live

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US / lɪv /

UK / liv /

A1
  • adjecitve
  • Being broadcast as events happen, not recorded
  • Carrying electric current; able to give a shock
  • Glowing because burning; hot
  • Not yet killed (for food)
  • adverb
  • (Music, drama) as it is performed
  • verb
  • To be alive
  • To experience a particular type of life
  • To make your home in a house or town

special

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US / 'speʃl /

UK / ˈspɛʃəl /

A1
  • adjecitve
  • Being additional or extra
  • Different, better or greater than normal
  • noun
  • Heavily discounted sales item

send

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US / send /

UK / sɛnd /

A1
  • verb
  • To cause to behave or respond in a particular way
  • To cause mail or packages to go to another place
  • To move something quickly in a particular way
  • To give information or greetings to someone

difference

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US / 'dɪfrəns /

UK / ˈdɪfərəns, ˈdɪfrəns /

A1
  • noun
  • A thing or issue that people do not agree about
  • Not of the same kind; unlike other things

centauri

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US / sɛnˈtɑri /

UK / /

A1
  • adjective
  • Used with preceding Greek letter or numeral to designate a star in the constellation Centaurus.
  • proper noun
  • A large southern constellation (the Centaur). It lies in the Milky Way and contains the stars Alpha

amount

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US / ə'maʊnt /

UK / əˈmaʊnt /

A1
  • noun
  • Quantity of something
  • verb
  • To add up to a certain figure

time

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US / taɪm /

UK / taɪm /

A1
  • noun
  • Speed at which music is played; tempo
  • Point as shown on a clock, e.g. 3 p.m
  • Number of hours, minutes needed to do something
  • Occasion when something happens
  • Period or occasion that something occurred
  • Period in history or the past
  • Something measured in minutes, hours, days, etc.
  • How long an event takes; duration
  • verb
  • To check speed at which music is performed
  • To choose a specific moment to do something
  • To measure how long an event takes, e.g. a race
  • To schedule something to occur at a specific moment

spend

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US / spend /

UK / spɛnd /

A2
  • verb
  • To use money to pay for something
  • To use time in order to do something
  • To use up something completely

through

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US / θru: /

UK / θru /

A2
  • adjecitve
  • having finished using or doing something
  • adverb
  • From the beginning of something until the end
  • preposition
  • Over, in, across an entire thing or place
  • Allowing you to pass between, or to
  • By a particular way or process; by the use of

infinity

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US / ɪn'fɪnətɪ /

UK / ɪnˈfɪnɪti /

B2
  • noun
  • State of being without end; endless time, space

for

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US / fə(r) /

UK / fɔr,fə /

A1
  • preposition
  • Used to show the purpose, or need of something

gotcha

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US / ˈɡɔtʃə /

UK / ˈɡɑtʃə /

B2
  • verb
  • Shortened form of 'got you'

accelerator

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US / əkˈseləreɪtə(r) /

UK / ækˈsɛləˌretɚ /

B1
  • noun
  • Pedal that controls the speed a vehicle moves

well

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US / wel /

UK / wɛl /

A1
  • adjecitve
  • Being in a fortunate, good condition or state
  • Healthy and in good condition
  • adverb
  • In an acceptable, proper, or successful manner
  • In a complete, total, or full manner
  • A great and considerable degree
  • In a successful way, in a good or satisfactory way
  • exclamation
  • Used to begin or continue a particular statement
  • Used to show you want to start saying something
  • Used to express that you are waiting for a reply
  • You say this to change the topic of a conversation
  • Used to indicate you are making a final remark
  • noun
  • Long deep hole in the ground to get water
  • verb
  • To cause your eyes to fill with tears

start

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US / stɑ:t /

UK / stɑrt /

A1
  • noun
  • First time or place that a thing exists; beginning
  • First opportunity to achieve something, e.g. a job
  • Sudden action or movement because you are scared
  • other
  • Beginning of something in place or time
  • verb
  • To do, be or happen for the first time; begin
  • To turn something on

tachyon

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US / 'tæki:ˌɒn /

UK / 'tæki:ˌɒn /

A1
  • noun
  • Hypothetical sub-atomic particle faster than light

test

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US / test /

UK / test /

A1
  • noun
  • A medical examination
  • Action to establish the truth or nature of
  • Examination; questions to measure knowledge
  • verb
  • To be given a medical examination
  • To try to establish the truth or nature of
  • To ask a series of questions to measure knowledge

limit

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US / 'lɪmɪt /

UK / ˈlɪmɪt /

A2
  • noun
  • Point beyond which it is not possible to go
  • verb
  • To stop or prevent an increase past a point

chariot

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US / 'tʃærɪət /

UK / ˈtʃæriət /

B2
  • noun
  • Ancient battle vehicle driven by standing soldier

those

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US / ðəʊz /

UK / ðoz /

A1
  • determiner
  • The people or things we are talking about
  • pronoun
  • The objects far from the speaker

myself

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US / maɪˈself /

UK / maɪˈsɛlf /

A1
  • pronoun
  • The same person who did the action mentioned
  • My regular, usual, or healthy self

max

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US / mæks /

UK / mæks /

A2
  • noun
  • Person's name
  • Short for 'maximum'

light

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US / laɪt /

UK / laɪt /

A1
  • adjecitve
  • Being bright making it easy to see; not dark
  • Being pale and lacking darkness of color
  • Not heavy; weighing only a little
  • adverb
  • Carrying few bags when traveling
  • noun
  • A source of energy that makes a room or area bright
  • Way in which something or someone is understood
  • verb
  • To cause something to burn; put a burning match to
  • To provide a way to see ahead

hour

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US / 'aʊə(r) /

UK / aʊr /

A1
  • noun
  • 60 minutes
  • Particular time of the day
  • Fixed, regularly occurring time

greek

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US / gri:k /

UK / ɡrik /

A1
  • adjecitve
  • Concerning the culture and people of Greece
  • noun
  • Person from Greece

dress

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US / dres /

UK / drɛs /

A1
  • noun
  • Women's garment with a top part and a skirt
  • Clothing suitable for a time period or occasion
  • verb
  • To prepare food (e.g. salad) before cooking or eating
  • To decorate something for display e.g. a mannequin
  • To put clothes on
  • To clean, care for and apply a cover to a wound

acceleration

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US / əkˌseləˈreɪʃn /

UK / ækˌsɛləˈreʃən /

B1
  • noun
  • Increase in the speed or rate of something

talk

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US / tɔ:k /

UK / tɔk /

A1
  • noun
  • Style of speaking
  • Discussion between two countries
  • Giving information in front of people; lecture
  • Saying things or ideas to someone with words
  • verb
  • To make a formal speech about something
  • To say things or ideas to someone with words

proton

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US / ˈprəʊtɒn /

UK / ˈproʊtɑ:n /

B2
  • noun
  • Tiny part of atom with positive electrical charge

just

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US / dʒʌst /

UK / dʒʌst /

A1
  • adjecitve
  • Proper or appropriate; as is deserved
  • Doing or being what is right or fair
  • Legally correct; having enough evidence
  • adverb
  • Almost; nearly
  • Exactly at the time of
  • Exactly (the same as, like)

water

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US / 'wɔ:tə(r) /

UK / ˈwɔtɚ, ˈwɑtɚ /

A1
  • noun
  • Clear liquid that forms the seas, rivers and rain
  • Large area such as an ocean or sea
  • verb
  • (Of the eyes) to produce tears
  • (Mouth) to become wet at the thought of nice food
  • To pour liquids onto a plant to keep it alive

sound

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US / saʊnd /

UK / saʊnd /

A1
  • adjecitve
  • Sensible, dependable and reliable
  • Unbroken or undisturbed, as of sleep
  • Firm or solid in structure
  • Sane; not mentally ill
  • Clearly reasoned; involving sense, good judgment
  • noun
  • Unique quality that characterizes a style of music
  • Waves traveling in air or water that can be heard
  • verb
  • To seem or appear to be, from what was said
  • To say in a clear deliberate manner
  • To make a noise, e.g. to ring a bell

mass

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US / mæs /

UK / mæs /

B1
  • noun
  • Religious ceremony in some Christian churches
  • Large amount or number of something
  • Main or largest part of something
  • Large number of people considered as a whole
  • Amount of matter that an object has
  • verb
  • To gather people or things into a large group

charge

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US / tʃɑ:dʒ /

UK / tʃɑrdʒ /

A2
  • noun
  • An attack by running quickly toward someone
  • A price for a service or goods
  • When a battery has a certain amount of electricity
  • Amount of money you pay for a service
  • verb
  • To run quickly toward someone to attack them
  • To ask for money as a price for a service or goods
  • To put electricity in a battery
  • To give responsibility to take care of or manage
  • To state that someone has committed a crime

cool

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US / ku:l /

UK / kul /

A1
  • adjecitve
  • Steady and calm when facing difficulties
  • Almost cold; not warm or hot
  • Smart or stylish in a way (young) people admire
  • Unfriendly in an indirect way; distant
  • verb
  • To make something decrease in temperature
  • (Of an emotion, etc.) to become less strongly felt

shorten

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US / 'ʃɔ:tn /

UK / ˈʃɔrtn /

A2
  • verb
  • To make something, e.g. a skirt, shorter

question

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US / 'kwestʃən /

UK / ˈkwɛstʃən /

A1
  • noun
  • Issue or problems you are dealing with
  • What you ask about; issue
  • verb
  • To ask for or try to get information
  • To have or express concerns or uncertainty

object

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US / 'ɒbdʒɪkt /

UK / ˈɑbdʒɪkt /

A2
  • noun
  • Something you can see or touch, but is not alive
  • Goal or purpose of a particular plan or activity
  • The thing that the action of a verb acts upon
  • verb
  • To disagree; to protest against an idea or plan

equation

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US / ɪˈkweɪʒn /

UK / ɪˈkweʒən, -ʃən /

B1
  • noun
  • Mathematical statement showing things to be equal
  • Complex set of different facts, ideas or issues

correct

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US / kə'rekt /

UK / kəˈrɛkt /

A2
  • adjecitve
  • Being suitable and appropriate for an occasion
  • True or accurate
  • verb
  • To fix a problem
  • To write marks on a piece of work to show mistakes
  • To punish in order to improve

vehicle

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US / ˈvi:əkl /

UK / ˈvi:hɪkl /

A2
  • noun
  • Machine (such as a car) used to carry things
  • Means of expressing, showing, or achieving

system

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US / 'sɪstəm /

UK / ˈsɪstəm /

A1
  • adjecitve
  • Working in an organized, logical way
  • noun
  • Set of organized, planned ideas that work together

stripe

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US / straɪp /

UK / straɪp /

B1
  • noun
  • Strip of alternating color in straight lines

few

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US / fju: /

UK / fju /

A1
  • pronoun
  • Not many, a small number

fact

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US / fækt /

UK / fækt /

A1
  • noun
  • Something that is known or proved to be true

explode

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US / ɪk'spləʊd /

UK / ɪkˈsplod /

B1
  • verb
  • To express an emotion in a sudden and loud way
  • To increase in number or amount very quickly
  • To burst or cause to burst into pieces

constant

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US / 'kɒnstənt /

UK / ˈkɑnstənt /

A2
  • adjecitve
  • Happening frequently or without pause
  • noun
  • Thing that happens always or at a regular rate

would

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US / wʊd /

UK / wʊd /

A1
  • other
  • Used to indicate something imagined
  • Used to ask or request something politely
  • Verb used to indicate possibility, request etc.
  • Used to indicate a preference
  • Used to indicate a reaction
  • Indicates something that occurred repeatedly
  • Used to indicate willingness or ability to do

involve

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US / ɪn'vɒlv /

UK / ɪnˈvɑlv /

A2
  • verb
  • To have or be included as a part of something

fork

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US / fɔ:k /

UK / fɔ:rk /

A2
  • noun
  • Place where a road, tree divides into two branches
  • Tool with 4-5 points for eating or digging
  • verb
  • To divide or separate into two branches

blue

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US / blu: /

UK / blu /

A1
  • adjecitve
  • Color of the clear sky
  • Feeling sad or down

slow

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US / sləʊ /

UK / sloʊ /

A1
  • adjecitve
  • Lacking activity, busyness or excitement
  • (Clock) showing time earlier than the actual time
  • Having difficulty understanding simple things
  • Moving or happening without speed; not fast
  • verb
  • To move, with less speed than before
  • To move or go without much speed

same

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US / seɪm /

UK / sem /

A1
  • adjecitve
  • Being equal in quality and amount
  • Identical; not different
  • Not changing; constant

bypass

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US / ˈbaɪpɑ:s /

UK / ˈbaɪˌpæs /

B2
  • noun
  • A road that goes around a town or village
  • verb
  • To go around something; avoid

carry

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US / ˈkæri /

UK / ˈkæri /

A1
  • verb
  • To have a child, be pregnant
  • To have a disease you might give to others
  • (Of stores) to sell a particular product
  • To hold something and move it to another place
  • To travel a long distance (sound)
  • To support the weight or burden of something

warp

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US / wɔ:p /

UK / wɔ:rp /

B2
  • noun
  • Twist or bend in something normally straight
  • Threads that go up and down on a loom, for weaving
  • verb
  • To influence someone to become bad/do evil thing
  • To become twisted out of natural or intended shape

whole

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US / həul /

UK / hol /

A1
  • adjecitve
  • Complete or full; all of
  • Being in a good condition
  • noun
  • Complete amount or sum; total

seventy

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US / ˈsevnti /

UK / ˈsɛvənti /

A1
  • number
  • 70

our

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US / 'aʊə(r) /

UK / aʊr /

A1
  • determiner
  • Belonging to us

not

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US / nɒt /

UK / nɑt /

A1
  • adverb
  • Word indicating the negative
  • (Used to form the negative of verbs)

zero

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US / ˈzɪərəʊ /

UK / ˈzɪroʊ /

A1
  • noun
  • Temperature when water turns to ice
  • number
  • Number 0
  • verb
  • To set a scale or other device to show 0

star

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US / stɑ:(r) /

UK / stɑr /

A1
  • noun
  • Very famous person, usually an entertainer
  • Someone who does something very well
  • Your horoscope
  • A bright planet of hot gas in the night sky
  • A 5-6 sided asterisk-shape
  • verb
  • To perform or play a main role in a movie, play
  • To do something very well
  • To mark with a 5-6 sided asterisk-shape

sonic

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US / ˈsɒnɪk /

UK / ˈsɑ:nɪk /

C1
  • adjecitve
  • Concerning sound, its waves, and speed

single

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US / 'sɪŋɡl /

UK / ˈsɪŋɡəl /

A1
  • adjecitve
  • Being one only, without others
  • Only; merely
  • Not married or in a relationship
  • noun
  • One run in cricket or a hit baseball
  • An individual song from a CD or album
  • Person who is not married or in a relationship

portal

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US / 'pɔ:tl /

UK / ˈpɔrtl, ˈpor- /

B2
  • noun
  • Type of gate or entry point, e.g. to the internet

life

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US / laɪf /

UK / laɪf /

A1
  • noun
  • All the living things e.g. animals, plants, humans
  • Period of time things live, from birth to death

give

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US / ɡɪv /

UK / ɡɪv /

A1
  • noun
  • Degree of flexibility in something, a material
  • verb
  • To hand over or present something to someone
  • To cause someone to have or experience something

bezel

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US / ˈbezl /

UK / ˈbɛzəl /

A1
  • noun
  • The oblique side of a cut gem; Sloping edge on a cutting tool.
  • A rim used to hold transparent covering object.

boom

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US / bu:m /

UK / bum /

B1
  • noun
  • Very fast increase in growth or popularity
  • A very loud and deep sound
  • verb
  • To experience a rapid increase in growth
  • To make a very loud and deep sound

towards

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US / tə'wɔ:dz /

UK / 'təuədz, twɔ:dz /

A1
  • preposition
  • In the direction of someone or something

can

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US / kæn /

UK / kən,kæn /

A1
  • noun
  • A metal container for storing food
  • other
  • Able to; have the skill to; have the time to
  • verb
  • To have permission to
  • To be possible to do
  • To preserve food by sealing it in a metal container

brother

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US / ˈbrʌðə(r) /

UK / ˈbrʌðɚ /

A1
  • noun
  • A boy or man who shares a parent with you

description

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US / dɪˈskrɪpʃn /

UK / dɪˈskrɪpʃən /

A2
  • noun
  • Explanation of what something is like, looks like

want

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US / wɔnt /

UK / wɑnt, wɔnt /

A1
  • noun
  • Something you desire or wish for
  • State or condition of poverty
  • verb
  • To desire or wish for something; hope for a thing

dot

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US / dɒt /

UK / dɑt /

B1
  • noun
  • Small round mark
  • verb
  • To place small amounts/things in various places
  • To mark something by placing a small, round spot

now

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US / naʊ /

UK / naʊ /

A1
  • adverb
  • At the present time or moment
  • Right away or in the next possible moment
  • Used to refer to something that just happened
  • Time between the present and a moment in the past
  • conjunction
  • Resulting from or because of something

fabric

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US / ˈfæbrɪk /

UK / ˈfæbrɪk /

B1
  • noun
  • Cloth or material
  • Basic structure
  • Subtitles section
  • Chuck.
  • Yeah.
  • Have you ever wanted to travel faster than light?
  • Sure.
  • I mean, who doesn't?
  • I mean, I spent countless hours just sitting around saying to myself, I wish I could go to like Proxima B and just float above it and be there.
  • You may know that Voyager One is the fastest thing we've ever sent.
  • out of the solar system.
  • If we had aimed that towards Alpha Centauri, the star system that contains Proxima, the very closest star to the sun, you would get there in plus or minus a few months, seventy thousand years.
  • But even if you went there at the speed of light, we would watch you take four years.
  • Your time would stop.
  • Right.
  • So you would get there instantly.
  • But you want to cross the galaxy, that's a hundred thousand years.
  • Earth's time for you to do that.
  • So we need other ways to travel.
  • So we know experimentally and theoretically that you cannot travel faster than light.
  • Right.
  • Through space.
  • Right.
  • However, some decades ago, someone hypothesized, suppose you don't increase your speed to try to get to the speed of light.
  • Suppose you exist on the other side of that boundary.
  • You just start life on the other side of that boundary.
  • What would that be?
  • What does that even mean?
  • So, if you look at the equations of relativity, there are three things that happen as you travel faster.
  • Your time slows down as you near the speed of light.
  • Right.
  • Your length shortens in the direction of your motion, and your mass increases.
  • Okay.
  • If you try to get to the speed of light as a physical object, your length shortens to zero, your mass goes to infinity,
  • and time stops.
  • Okay, this is just insane.
  • This is insane.
  • Because the equations blow up there.
  • That's the numbers, right?
  • Okay, the numbers give you, all right.
  • So, it was hypothesized, suppose you come at it from the other side.
  • So, you're not working your way towards the speed of light, you just exist with speeds that are already faster than the speed of light.
  • So, you don't have this violation of approaching the speed of light itself.
  • Okay.
  • When you do that, what comes out the other side is that you live backwards in time.
  • Oh, that's a bezel rimmed button.
  • Okay, so it's not just that time slows down.
  • Time now goes backwards, A. B, the slowest you can travel is the speed of light.
  • The speed of light, right.
  • And in fact, it would take infinite energy to slow you down to that speed.
  • Right.
  • In the same way it would take infinite energy to speed you on this side of that universe.
  • To speed you up to the speed of light.
  • Infinite energy to speed you up to that speed.
  • Right.
  • So someone said, could anything exist there?
  • And so we came up with it.
  • We, people decades ago, came up with the name tachyons.
  • And that's because they dress poorly.
  • Tachyons.
  • Mixing stripes and polka dots and all kinds of madness.
  • But electrons and protons, they're badass.
  • Electrons and protons, they GQ to the max.
  • Plus they'll come late, or they'll come early.
  • They don't even know when to show up.
  • What do you want?
  • I'm on tachyon time, brother.
  • Tachyons, from the Greek, is a word for speed.
  • Okay.
  • So tachyons, the slowest they can go is the speed of light, and the fastest they can go is infinite speed.
  • Right, yeah.
  • So in that case, you can go any distance.
  • You can go any distance you want.
  • In any amount of time.
  • Right?
  • Because at that point, you don't need a warp engine.
  • You need a tachyon engine.
  • You need a tachyon.
  • A propulsion.
  • A tachyon chariot to carry you through the galaxy.
  • That's so nice.
  • Well, look at that.
  • Well, you made it very poetic.
  • It's the vehicle of the Greek gods.
  • Here's an interesting fact, that the early universe expanded faster than the speed of light.
  • Right.
  • Okay.
  • Now, the way that happened was,
  • The space itself is expanding.
  • Right.
  • Nothing is moving through space.
  • Nothing's moving through space.
  • Right.
  • Right.
  • Space is no longer a medium.
  • It's the actual vehicle.
  • The medium through which you're moving, it is the thing itself.
  • It's the thing that's moving.
  • And there's no violation of the speed of light there.
  • And we learn that from the general theory of relativity, which generalizes all of the parameters for which there were very specific descriptions in the special theory of relativity.
  • Right.
  • In other words, the special theory of relativity involved
  • A constant motion with no acceleration.
  • So it's a simplified case, if we can call relativity simple at all.
  • The simplified case.
  • The general relativity involves accelerations and gravity and curved space time and all the rest of this.
  • Right.
  • When you learn about space and time as a fabric of the universe, it can stretch at any speed at all.
  • And the early universe stretches faster than light.
  • So that's where that's coming in.
  • Right.
  • In case there was a question about it.
  • Yeah.
  • It turns out you can travel faster than light in a medium where light travels with a lower speed than it would in a vacuum.
  • Okay, so like water going, like water?
  • Light going through water?
  • Light going through glass, light going through diamond, all travel slower than light going through a vacuum.
  • Gotcha.
  • Those lower speeds, hey, we can go fast.
  • We know how to send particles faster than those speeds.
  • We do that all the time when we accelerate electrons and protons in particle accelerator.
  • So in a diamond, light travels forty percent as fast as it does in empty space.
  • Wow.
  • If light were sixty miles an hour, in a diamond, light's going twenty four miles an hour.
  • Right.
  • So what happens now if we send a particle faster than light in the medium?
  • We didn't know, and it was tested.
  • And we found out that when that happens, the whole universe explodes.
  • Everything disintegrates like a Thanos snap.
  • So you have water, and so now you take a particle and accelerate it, not only to the speed of light in water, but exceeding it.
  • And when that happens, there's a flash of light.
  • And it's called, in that case, Cherenkov radiation.
  • Cherenkov radiation.
  • The speed of light would be faster in air, but still slower than the vacuum.
  • Slower than the vacuum of space.
  • So if air is less dense than water, water is less dense than diamond.
  • Right.
  • Okay.
  • So back to So we're getting slow light when it hits our atmosphere and comes down to us.
  • It's already slowed down.
  • It's already slowed down.
  • It's already slowed down.
  • So it bends in the atmosphere, and then it bends again going into the water.
  • You have a diamond ring underwater, it bends going into the diamond ring.
  • Wow.
  • So you get a fork.
  • war band path on that.
  • So, my point is, going faster than light triggers this reaction between the charged particle, electron or proton, and the medium, and flashes of blue light come out.
  • It's called Cherenkov radiation.
  • Cherenkov light, just to be simple.
  • All light is radiation, so it scares people.
  • It was radiation, oh my God.
  • Yeah, you're being bombarded with radiation every single day, all day.
  • Correct.
  • It's just low energy radiation.
  • Your arms don't fall off, right?
  • Right.
  • Okay.
  • High energy radiation, that is ionizing.
  • That's bad for you.
  • Low energy radiation, it makes no difference to your body.
  • Body doesn't care.
  • Exactly.
  • So, this thing about going faster than light and then emitting this energy is kind of like a sonic boom, right?
  • I mean, it's conceptually similar.
  • You go faster than sound in the medium.
  • Then there's this shockwave that runs out upon doing so.
  • So think of it as kind of a light shockwave.
  • Oh, that's pretty cool.
  • You know what will just bypass tachyons?
  • What's that?
  • Wormholes.
  • Of course, yes.
  • Yeah, wormholes, you don't need rockets.
  • You don't need transporters like what they have on Star Trek.
  • Right.
  • Just open a portal, step through, you're there.
  • There you go.
  • You don't have to be dematerialized, beamed, and then rematerialized on the other side.
  • And not only that, that material, I think, only goes at the speed of light.
  • You're still limited by the speed of light even when they do beam.
  • Right.
  • All right, that's all I got for you.
  • All right.
  • This is the most time we've ever spent about talking about something that we don't know exists.
  • That we don't know exists.
  • That's pretty cool.
  • There it is.
  • All right, Chuck.
  • All right.
  • There's been another StarTalk explainer, this one on Tachyon.
  • A lot of fun.
  • And all things faster than light.
  • Until next time, keep looking up.