I got this from Google and it has all the information about a light year.
1 light year =
9.4605284 × 1015 meters
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- light yearnounASTRONOMY
- a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 trillion miles).
- informal
a long distance or great amount.
"the new range puts them light years ahead of the competition"