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unit 2 lesson 1

vocab terms

solar system the sun of all the planets and other bodies that travel around it
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 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 it were seen from a standard distance
Created by: 4804051117