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unit 2

TermDefinition
universe space and all the matter and energy in
solar system the sun and all of the planets and other bodies that travel around it
galaxy a collection of stars, dust, and gas bound together by gravity
light-year the distance that light travels in one year; about 9.46 trillion kilometers
star a large celestial body that is composed of gas and that emits light; the sun is a typical star
apparent magnitude e brightness of a star as seen from Earth
star a large celestial body that is composed of gas and that emits light; the sun is a typical star
luminosity the actual brightness of an object such as a sta
absolute magnitude a measure of how bright a star would be if it were seen from a standard distance
Created by: Thomas Slider
 

 



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