Define a light year. What is its relation with meter.
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Define a light year. What is its relation with meter.
A light-year, also light year or lightyear (symbol: ly) is a unit of length, equal to just under 10 trillion kilometers (10×1015 meters, 10 petameters or about 6 trillion miles). As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year.
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light-year, also light year or lightyear (symbol: ly) is a unit of length, equal to just under 10 trillion kilometers (10×1015 meters, 10 petameters or about 6 trillion miles). As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year.
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