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| Chapter 4 |
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accelerate
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increase speed
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assume
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believe something is true
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astronauts
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people trained to fly a spacecraft
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breakthrough
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an advance or discovery
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calculation
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math
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clever
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smart
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cosmos
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everything that is in space
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engineers
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people who design or construct structures
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exploit
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use or develop
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fireflies
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insects that light up
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galaxy
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a large group of stars and planets
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mass
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the measure of a solid body
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measure
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an amount of something
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mere
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small, only
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paces
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steps
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pass by
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go on
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predicted
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guessed, based on knowledge
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solar probe
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a small spacecraft sent to study the sun
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speed of light
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the rate at which light moves
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structure
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the way parts are put together
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sustained
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kept up or maintained
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thrust
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forced
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universe
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all of space including galaxies, stars, and planets
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unmanned
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having no crew or passengers
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vast
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large
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wormholes
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holes that lead somewhere else in space
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