what do you mean by lightyear
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A 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 p recisely, one light-year is equal to 9,500,000,000,000 kilometers
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Its a unit used to measure distance in space.
It is defined as the distance travelled by light in one year.
Which is equals to..
1000,000×365×24×60×60 m.
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