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15.6: Galaxies

Difficulty Level: At Grade Created by: CK-12
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Vocabulary

TermDefinition
dwarf galaxy A small galaxy containing a few million to a few billion stars.
elliptical galaxy An oval or egg shaped galaxy with older stars and little gas and dust.
galaxy A very large group of stars held together by gravity; few million to a few billion stars.
irregular galaxy A galaxy that is neither spiral nor elliptical.
spiral arm Regions of gas and dust plus young stars that wind outward from the central area bulge.
spiral galaxy A rotating type of galaxy with a central bulge and spiral arms with stars, gas and dust.

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Difficulty Level:
At Grade

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Date Created:
Feb 24, 2012
Last Modified:
Sep 12, 2016
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SCI.ESC.942.L.1