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Light years are a measure of distance, not speed; it is the distance light would travel in the time of one year. According to Eyewitness's Astronomy, a light year travels at up to 5.9 mph (per SECOND) and 9.5 kph (per SECOND) so multiply that by 60, times that by 60, multiply that by 24, and that by 365, and you should have a pretty close estimate, as to how far away a light year is.

Miles: 176,601,600 (5.9*60*60*24*365)

Kilometers: 299,592,000 (9.5*60*60*24*365)

(remember this is an approximation)

Hope this helped you!

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Q: How fast in mph is a light year?
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