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What is a light year?


Options:
A .   It is the speed at which light travels for one year
B .   It is the time taken by the light to reach the earth
C .   It is the distance which the earth travels in one year
D .   It is the distance which light travels in one year
Answer: Option D
:
D

A light year is defined as the distance traveled by light in one year. For example if a star is 4 light years away from earth, it means that light from that star will take 4 years to reach Earth.


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