Question

Which of the following statements is true about a light year?

A.It is the distance to Alpha Centauri.
B. It is shorter than the astronomical unit.
C. It is used to measure long periods of time.
D. It is used to measure long distances in space.
flvs science
PLZ give me an accurate answer.

Answer 1

The answer would be D. This is used to measure long distances in space. An example would be the nearest sun Proxima Centauri is 4.22 light years away. 

Answer 2

Right answer: It is used to measure long distances in space

A light year (
`ly`) is a distance unit that is approximately
`9.46×{10}^(12)km`.

By definition it is the distance that a photon would travel in vacuum during a Julian year (365.25 days) at the speed of light (299 792 458 m/s) at an infinite distance from any gravitational field or field magnetic.

In other words:

It is the distance that light can travel in a year.

This unit is used to measure large distances in space. Therefore the correct answer is D.