How do you measure a light year?
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Astronomy
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Answer:
A light year is the distance light travels in a vacuum in one Julian year. Figuring light travels at 186,000 miles a second how many miles will it travel in a year? A rough estimate would be: 60 x 60 x 24 x 365.25 x 186,000. In 1 minute it would travel 60 X 186,000 miles; in 1 hour it would travel 60 times that number of miles, and so on. It comes close to 9.5 trillion kilometers, or about 5.9 trillion miles
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