Question

which statement accurately describes a light-year?
○ it is the shape of a galaxy.
○ it is the distance that light travels in a year.
○ it is a yearly measurement of light given off by stars.
○ it is the amount of time it takes light to travel one million kilometers.

Explanation:

A light-year is a unit of astronomical distance, defined as the distance that light travels in one Earth year. The other options are incorrect: it is not a galaxy shape, not a measurement of stellar light output, and not a time measurement for a short distance.

Answer:

It is the distance that light travels in a year.