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How are light years used in science. 20 POINTS!!!

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A light year is used to measure distance in space. A light year is a unit of distance. It is the distance that light can travel in a year's time which is six trillion miles.
User Mnutsch
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A light year is used to measure the distance in space. A light year can is a Unit of Distance. It is the distance that light can travel in a years time.
User Amit Kotha
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