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?
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So, light year is not a unit of time.
It refers to the distance travelled by a light ray in 1 year.
Thus, the statement means,
the light ray emitted from the earth would take 8 years to travel to the star with its uniform speed of 299792458 m/s.
Hope the concept is clear!
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