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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?
The distance of the stars from the Earth or the distance between any two stars are . So, it is inconvenient to express the distances in terms of . Hence, the large distances are expressed in .
It is defined as the travelled by . The value of one light-year is given as \(\times {10}^{12}\) \(kilometres\).
A star is \(8\ light\ -years\) away from the Earth means that the star is at a equal to the distance covered by light in years. Hence, the value is \(\times {10}^{13}\) \(kilometres\).
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