Question

what is a light year

Answer 1

hello dear
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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.
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Answer 2

Light year

A unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 million million miles).

To give you a sense of closer light, put your hand one foot in front of your eyes. The light from your hand is one nano-second old. It takes your brain as much as 10 milliseconds to be aware of the vision. Light will travel one third of a mile in that time. It takes over a second for light from the moon to reach us.