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Unit 2

The Universe

TermDefinition
solar system The sun and all of the planets and other bodies that travel around it.
planet 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.
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.
universe Space and all the matter and energy in it.
apparent magnitude The brightness of a star as seen from earth.
luminosity The actual brightness of an object as a star.
absolute magnitude Absolute magnitude is a measure of how bright a star would be if it were seen from a standard distance.
 

 



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