Question

Which unit would you prefer to make the measurement of the distance between two celestial bodies?

Answer 1

1. It is the distance traveled by light in one year in a vacuum.
2. 1 light-year(ly)=$9.46\times {10}^{15}mor9.46\times {10}^{12}km$
3. It is used to measure the distance of stars from earth.

Hence, light year (ly) is sued to measure the distance between two celestial bodies.