Chapter - 7 Stars and the Solar System

Q&A -Ask Doubts and Get Answers

Q
Stars and the Solar System

Question:

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?

Answer:

The distance of the star from the earth and the distance between the stars is very large. It is unrealistic to express this distance in SI unit of distance kilometre (km). Therefore, these huge distances are expressed in a unit called a light years.

One light year is equal to the distance travelled by the light in one single year.

1 Light Year =  9.46 	imes 10^{12} km.

A distance of the star from the Earth is eight light years. This means the distance between them is equal to the distance travelled by the light in eight years.

So, the distance of the star from the earth is 8 	imes 9.46 	imes 10^{12} km which is equal to 7.56 	imes 10^{13} km.


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