what is a light year ?6th very short answer.
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WHAT IS A 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).
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A light-year is defined as the measurement of length or the distance light travels in a vacuum in a year. One light-year is close to 6 trillion miles.
Example of a light-year
Reflected sunlight travelling from the moon’s surface takes 4.04 × 10-8 light-years to reach the earth.
It takes 1.58 × 10-5 light-years for light from the Sun to reach the earth.
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