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A light-year is the distance that light travels in one year.

Light travels at 186,000 miles per second, or 300,000 km per second.

There are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day and 365.26 days in a year. Just multiply all those numbers together.
Distance. It is the distance light travels in a year.

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14y ago

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