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unit 2

vocab terms

TermDefinition
solar system the sun and all of the planets and other bodies travel around it
galaxy a collection of stars,dust,and gas bound together by gravity
planet a relativley large spherical l body that orbit a star
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
universe space and all the matter and energy in it
lumionisty the actual brightness of an object such as a star
apparent magnitude the brightness of the stars as seem from earth
absolute magnitude any method of measuring of how bright star would be if it where seen from a standard distance
Created by: 4801841260
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