Question

A light-year is a unit used to measure what?

Hint:

This unit tells you how far light can travel in twelve months, not how long something takes.

Answer 1

The correct answer is astronomical distance.
A light-year is the distance that light travels in one year while moving through a vacuum.
Since light travels at about 300,000 kilometres per second, one light-year works out to nearly 9.46 trillion kilometres.
Scientists use this unit because the distances between stars and galaxies are far too large to express conveniently in kilometres.
For example, the nearest star system to our Sun, Proxima Centauri, is about 4.24 light-years away.
Despite the word "year" in its name, a light-year measures distance and not time.