Question

What is the need of using the light year as the unit of distanace in space ? Define light year and calculate the value in terms of kilometre.

Answer 1

Dear Student,
Light is an unit used to measure the larger distances or astronomical distances.

A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km.
More precisely, one light-year is equal to 9,500,000,000,000 kilometers.

Regards