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What is a light-year and how is it used??
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View question - one light year equals 5.9*10^12 miles. How many light-years are in 6.79*10^16 miles?
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SOLVED:Astronomy One light-year is defined by astronomers to be the distance that a beam of light will travel in 1 year (365 days). If the speed of light is 186,000 miles per