By Lucas Vieira - Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=3270145

#1 One light year is the amount of distance light travels in a single year.

Light travels at about 186,000 miles per second, so one light year equates to approximately 5,900,000,000,000 miles or Five Trillion, Nine Hundred Billion Miles!

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