Question

Define – Light year. class 8​

Answer 1

Answer:

A light-year is defined as the measurement of length or the distance light travels in a vacuum in a year. One light-year is close to 6 trillion miles. Reflected sunlight travelling from the moon's surface takes 4.04 × 10-8 light-years to reach the earth.

Answer 2

Answer:

A unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km i.e. about 6 million miles is called light year.

Explanation:

Light travels fast. For example: When you lit a light bulb, the light is spread all over the room in the matter of seconds. The place where it takes light to reach 1 year in that speed then it is known as light year.