Question

What is light year??
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Answer 1

Light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. More precisely, one light-year is equal to 9,500,000,000,000 kilometers.

Answer 2

• A light-year, alternatively spelt lightyear, is a unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers or 5.88 trillion miles.
• As defined by the International Astronomical Union, a light-year is the distance that light travels in vacuum in one Julian year.