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8.9B Vocab

TermDefinition
Elliptical galaxy a type of galaxy that has an elliptical appearance
Galaxy a collection of stars, dust, and gas bound together by gravity
Irregular galaxy a small galaxy that has no identifiable shape and that contains a great amount of dust and gas
Light-year the distance that light travels in one year; about 9.46 trillion kilometers
Spiral galaxy a galaxy that consists of a nucleus of older stars and a disk with spiral arms made mainly of dust, gas, and young stars
Luminosity the actual brightness of an object such as a star
Solar system the sun and all the planets and other bodies that travel around it
Star a large celestial body that is composed of gas and that emits (gives off) light
Created by: Ssapp20
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