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unit 2 lesson 1+2

vocab tems

TermDefinition
solar system the sun and all of the planets and other bodies that travel around it (55,86)
galaxy a collection of stars, dust , and gas bound together by gravity
planet a relatively large spherical body that orbits 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: the sun is a typical star
universe space and all the matter and energy in it
luminosity the actual brightness of an object such as a star
apparent magnitude the brightness of a star as seen from earth
absolute magnitude a measure of how bright a star would be if were seen from a standard distance
Created by: 4804331765
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