Why is the distance between stars expressed in light years? What do you understand by the statement that a star is eight light years away from the Earth?

AcademicPhysicsNCERTClass 8

To do:

We have to explain the reason for expressing the distance between stars in light years. Additionally, we have to explain the statement: "A star is eight light years away from the Earth"

Explanation:

Let us know what is "light-year" is and the reason for expressing the distance between stars in light-years.

Light year:

Light-year is the unit of distance. One light-year is equal to the distance traveled by a light ray in one year.

Light-year is used to express large distances:

The distance between stars and the Earth is very large and it is not easy to express such large distances in kilometers. Thus, this type of large distance is expressed in a unit known as the light year.

"A star is eight light years away from the Earth":

If it is said that a star is eight light-years away from Earth, it means that the light from the star will reach the Earth in eight years.

raja
Updated on 10-Oct-2022 13:25:32

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