What does it mean when scientists say that a planet or star is a certain amount of light years away?
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Light years is defined as a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 million million miles). So, if we say that a certain planet or a star is a certain light years away, it means it that light
garimas0410:
It means that light would take this much amount of time to travel to that particular place..
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