define lightyear.how many kilometers make 1 lightyear
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a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 million million miles).
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a long distance or great amount.
"the new range puts them light years ahead of the competition"
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Light year {unit of distance}
•Light year is the distance travelled by a light in a year in vaccum (or space).
•9.461 × 1012 kilometres
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