Star Systems and Galaxies
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11 terms
Terms | Definitions |
|---|---|
 binary star | A star system with two stars. |
| eclipsing binary | A binary star system in which one star periodically blocks the light from the other. |
| open cluster | A star cluster that has a loose, disorganized appearance and contains no more than a few thousand stars. |
| globular cluster | A large, round, densely-packed grouping of older stars. |
| galaxy | A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity. |
| spiral galaxy | A galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern. |
| elliptical galaxy | A galaxy shaped like a round or flattened ball, generally containing only old stars. |
| irregular galaxy | A galaxy that does not have a regular shape. |
| quasar | An enormously bright, distant galaxy with a giant black hole at its center. |
| universe | All of space and everything in it. |
| scientific notation | A mathematical method of writing numbers using powers of ten. |
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