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5 Cards in this Set
- Front
- Back
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galaxy
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a collection of stars, dust, and gas bound together by gravity
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nebula
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a large cloud of gas and dust in interstellar space; a region in space where stars are born
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globular clusters
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a tight group of stars that looks like a ball and contains up to 1 million stars
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open cluster
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a group of stars that are close together relative to surrounding stars
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quasar
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quasi-stellar radio source; a very luminous object that produces energy at a high rate; quasars are thought to be the most distant objects in the universe
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