A light year (ly) is a unit of distance defined as the distance light travels in one year. Numerically, 1 ly= 9 500 000 000 000 km. How many metres are in a light year?
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/img/iea/bjOLknylwe/what-is-lightyear.jpg "Light year: What is a light year and How long is a light year")
Light year: What is a light year and How long is a light year
What is a light-year?
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