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Chapter 4 Science
Lesson 5 Star Systems and Galaxies
Term | Definition |
---|---|
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 |
Quaear | an enormously bright, distant galaxy with a giant black hole at its center |