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Definition
| a star system with two stars |
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Definition
| a binary star system in which one star periodically blocks the light from the other |
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Definition
| a star cluster that has a loose, disorganized appearance and contains no more than a few thousand stars |
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Definition
| a large, round, densely-packed grouping of older stars |
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Definition
| a huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity |
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Definition
| a galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern |
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Definition
| a galaxy shaped like a round or flattened ball, generally containing only old stars |
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Definition
| a galaxy that does not have a regular shape |
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Definition
| an enormously bright, distant galaxy with a giant black hole at its center |
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Definition
| all of space and everything in it |
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Definition
| a mathematical method of writing numbers using powers of ten |
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