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galaxy a collection of stars, dust, and gas bound together by gravity
planet a relatively large spherical body that orbits a star
solar system a relatively large spherical body that orbits a star
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
light year the distance that light travels in one year; about 9.46 trillion kilometers
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
luminosity the actual brightness of an object such as a star
galaxy a collection of stars, dust, and gas bound together by gravity
planet a relatively large spherical body that orbits a star
solar system a relatively large spherical body that orbits a star
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
light year the distance that light travels in one year; about 9.46 trillion kilometers
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
luminosity the actual brightness of an object such as a star
Created by: Bradley J
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