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How Long Would it Take to Walk a Light-Year?
What Is a Light-Year? | NASA Space Place – NASA Science for Kids
What Is a Light-Year? | NASA Space Place – NASA Science for Kids
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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
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Light year: What is a light year and How long is a light year
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