Question

define light year ????
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Answer 1

Explanation:

light year

noun

ASTRONOMY

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).

INFORMAL

a long distance or great amount.

"the new range puts them light years ahead of the competition"

Answer 2

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Riess (STScI/JHU)) A light-year is a measurement of distance and not time (as the name might suggest). A light-year is the distance a beam of light travels in a single Earth year, or 6 trillion miles (9.7 trillion kilometers). On the scale of the universe, measuring distances in miles or kilometers doesn't cut it.

Coe et al. For most space objects, we use light-years to describe their distance. A light-year is the distance light travels in one Earth year. One light-year is about 6 trillion miles (9 trillion km).