Light year is a unit for measurement of

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age of universe

very small time intervals

very high temperature

very large distance

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This question was previously asked in

UPSC NDA-1 – 2018

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The correct answer is D.

A light-year is defined as the distance that light travels in vacuum in one Julian year (365.25 days). Since the speed of light is constant and very high, a light-year represents a very large distance. It is commonly used in astronomy to measure the distances between celestial objects, such as stars and galaxies. It is not a unit of time, temperature, or a measure related to the age of the universe (although the size of the observable universe is often expressed in light-years, its age is in years).

One light-year is approximately 9.461 trillion kilometers (5.879 trillion miles). Other units for measuring astronomical distances include the Astronomical Unit (AU) and the Parsec.

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