noun
a unit of astronomical distance equivalent to the distance that light travels in one year, which is approximately 5.88 trillion miles
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A light year is a unit of astronomical distance equivalent to the distance that light travels in one year.
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Did you know that a light year is the distance light travels in one year?
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That spaceship can go like a million light years per hour, dude!
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Her progress in the project was like moving at the speed of light year compared to her colleagues.