Light year is a unit of measurement of

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very large distances

time interval in years

amount of light received on earth in a year

mass of atoms

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This question was previously asked in

UPSC NDA-1 – 2019

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Light year is a unit of measurement of very large distances.

A light-year is defined as the distance that light travels in vacuum in one Julian year (365.25 days). It is a unit of length used to express astronomical distances.

The speed of light in vacuum is approximately 3 x 10⁸ meters per second. One light-year is approximately equal to 9.461 x 10¹² kilometers or 5.879 x 10¹² miles. This unit is convenient for measuring the vast distances between stars and galaxies.

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