define 1 light year of distance.(1 mark question)
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One light year is the distance travelled by the light in one year at the speed of 3*10^8m/s
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The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometres or 5.88 trillion miles. As defined by the International Astronomical Union, a light-year is the distance that light travels in vacuum in one Julian year.
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