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Define light- year and explain how and why light- years are used to measure distances in the universe
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Define light- year and explain how and why light- years are used to measure distances in the universe

User Pholser
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A unit of astronomical distance equivalent to the distance that light travels in one year .....and because it is the fastest way to measure in a very long distances for example earth to other far away planets
User ShpielMeister
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