Question

what is a lightl year​

Answer 1

The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometres or 5.88 trillion miles. As defined by the International Astronomical Union, a light-year is the distance that light travels in vacuum in one Julian year.

Answer 2

Explanation:

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"