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Tuesday, 2 June 2015

Do all the stars in the sky move And Explain

Do all the stars in the sky move And Explain. 

Answer: Stars are at a distance of millions of km from the earth. Thus, these large distances are expressed in light years. One light year is the distance traveled by light in one year. 

One light year is equal to 9.46 × 1012 km. For example, if a star is eight light years away from the Earth. Eight light years mean time taken by light
to travel in eight years. 

This means that the distance between the star and the Earth is 
8 × (9.46 × 1012) = 7.6 × 1013 km

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