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Freethinkers How far exactly is a light year Light travels 186,000 miles per second. There are 60 seconds in … | Astronomy facts, Space and astronomy, Astrophysics
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Light-year - Wikipedia
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What Is a Light-year? | HowStuffWorks
Exit : Why is a light year called a light year? - ppt download
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How Far is a Light Year? - Universe Today
