Question

question 15 (1 point)
listen
a__________is the distance that light travels in one year, and it is how extremely large distances in space are measured.
decade
centimeter
kilometer
light - year

Explanation:

A decade is a period of ten years, not a distance. A centimeter and a kilometer are units of length but not specifically defined as the distance light travels in a year. A light - year is defined as the distance that light travels in one year and is used to measure extremely large distances in space.

Answer:

light - year