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vocab terms

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Term
Definition
Solar system   show
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Galaxy   show
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Planet   show
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show The distance that light travels in one year about 9.46 trillions kilometers.  
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show A large celestial body that is composed of gas and the emits light the sun is a typical star.  
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Universe   show
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Luminosity   show
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show The brightness of a star as seen from earth.  
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show A measure of how bright a star would be if it were seen from a standard distance.  
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