Galaxies
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5 Terms
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galaxy
a huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity
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universe
All of space and everything in it
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light-year
the distance light travels in one year. (about 9.5 trillion km)
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big bang
the initial explosion that resulted in the formation and expansion of the universe
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determine
To arrive at an answer by doing research.
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Flashcards (26)