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21-4
Bonnie Branch 6th Grade - 21-4 / Star Systems and Galaxies
Term | Definition |
---|---|
binary star | A star system that contains two stars |
eclipsing binary | A star system in which one star periodically blocks the light from another |
spiral galaxy | A galaxy whose arms curve outward in a pinwheel pattern |
elliptical galaxy | A galaxy shaped like a flattened ball, containing only old stars |
irregular galaxy | A galaxy that does not have a regular shape |