what is light year?
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The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometres (9.46 x 1012 km) or 5.88 trillion miles (5.88 x 1012 mi).[note 1] As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days).[2] Because it includes the word "year", the term light-year is sometimes misinterpreted as a unit of time.
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Explanation:
THE LIGHT YEAR IS USED TO EXPRESS THE ASTRONOMICAL DISTANCES.
THE MEANING OF LIGHT YEAR IS
THE DISTANCE TRAVELLED BY THE LIGHT IN ONE YEAR IS CALLED A LIGHT YEAR
1 LIGHT YEAR=9.461×1015 metres
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