Question

What is light year ? why is the distance of stars from the earth measured in light years and not in Kms? b. calculate the value of one light year in KMS

Answer 1

distance travelled by light in one year is light year.the sun is nearly 150,000,000 km away from the earth. the large distance are expressed in the unit called light year...

Answer 2

Light year is the distance traveled by light in one year. This unit is used for measuring the distance between the stars because the distance between them is very large. For example, the distance to the next nearest big galaxy, the Andromeda Galaxy, from earth is around 21,000,000,000,000,000,000 km. but if we write that in light years, it will be around 2.3 million light years.

1 light year = 9,460,730,472,580.8 km or about 9.5 trillion km