What is light year.....? The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometers or 5.88 trillion miles. As defined by the International Astronomical Union, a light-year is a distance that light travels in a vacuum in one year. - Study24x7
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What is light year.....? The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometers or 5.88 trillion miles. As defined by the International Astronomical Union, a light-year is a distance that light travels in a vacuum in one year.

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