Honors Physical Science - Vocabulary 20
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13 Terms
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Star
A large celestial body that is composed of gas and that emits light
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Light Year
The distance that light travels in one year
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Red Giant
A large, reddish star late in its life cycle
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White Dwarf
A small, hot, dim star that is the leftover center of an old star
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Supernova
A gigantic explosion in which a massive star collapses and throws its outer layers into space
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Black Hole
An object so massive and dense that not even light can escape its gravity
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Galaxy
A collection of stars, dust, and gas bound together by gravity
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Cluster
A group of stars or galaxies bound by gravity
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Interstellar Matter
The gas and dust located between the stars in a galaxy
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Quasar
A very luminous object that produces energy at a high rate: thought to be the most distant objects in the universe
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Universe
The sum of all space, matter, and energy that exist that have existed in the past, and that will exist in the future
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Doppler Effect
An observed change in the frequency of a wave when the source or observer is moving
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Big Bang Theory
The theory that all matter and energy in the universe was compressed into an extremely small volume that 13-15 billion years ago exploded and began expanding in all directions
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