a light-year is a unit of?

Question – a light-year is a unit of?

Answer: A light-year is a unit of distance used in astronomy.

A light-year is a distance that light travels in one year, approximately 9.5 trillion miles (15 trillion km). It was first defined by Isaac Newton and then redefined by James Bradley in 1728 as the distance that light travels in a vacuum during a year, or 9.46078 x 10**11 kilometers at the rate of 299 792 458 m/s.

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