What is a light year and how it is measured? - ProProfs Discuss
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What is a light year and how it is measured?

What is a light year and how it is measured?

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Asked by J. Pollock, Last updated: Feb 09, 2020

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C. Marcus

C. Marcus, Content Developer, Washington

Answered Oct 05, 2018

According to the definition given by International Astronomical Union (IAU), a light year is the distance that light travels in a vacuum. A light year is a unit used to express and measure astronomical distances.

According to IAU, light year is the product of Julian year (365.25 days) and the speed of light (299792458 m/s).
1 light year = 9460730472580800 metres.

 

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