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A light-year is a measurement of distance and not time (as the name might suggest). A light-year is the distance a beam of light travels in a single Earth year, or 6 trillion miles (9.7 trillion kilometers). On the scale of the universe, measuring distances in miles or kilometers doesn't cut it
Light year is the unit of measuring distance. 1 light year is the distance travelled by light in 1 year. It is used to measure large distances like distance between sun and earth or other stars etc.
light-year is the distance that light travels in vacuum in one Julian year (365.25 days)