A light year is the distance light travels in one earth year learn about how we use light years to measure the distance of objects in space. Stars other than our sun are so far distant that astronomers speak of their distances not in terms of kilometers or miles but in light yearslight is the fastest moving stuff in the universe. How long is a light year the light year is a measure of distance not time it is the total distance that a beam of light moving in a straight line travels in one year
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