Question

Light year is ___________​

Answer 1

Light-year is the distance light travels in one year. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year.

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Answer 2

Light-year is the distance light travels in one year. IT IS A UNIT OF LENGTH.  As defined by the International Astronomical Union, a light-year is the distance that light travels in vacuum in one Julian year.

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