define of light year
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According to my book..
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).
In other words......
a long distance or great amount.
"the new range puts them light years ahead of the competition"
Answered by
10
Answer:
A light year is the distance travelled by light in vacuum, in one year.
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