The distance that light travels in one year in a vacuum. 5,878,625,373,183 miles.
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Submitted 359 days ago...
A lightyear is the distance a light photon travels through the vacuum of space in one year.
When talking about stars and how they are 10 light years away for example means that you would have to travel at the speed of lights, 10 years to get to that star. And if that star exploded today, we would see the star explode in 2017 in the night sky.
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