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A light-year is exactly 9,460,730,472,580,800 meters.
This is about 9.5 × 1015 meters, 9.5 Pm (petametres), or about 9.5 quadrillion meters.
It is defined as the distance that light travels in a vacuum in one Julian year. As a Julian year is defined as exactly 365.25 days, and the speed of light in a vacuum is defined as exactly 299,792,458 meters/second, a light year is
365.25 days × (24 hours/day) × (60 minutes/hour) × (60 seconds/minute) × 299,792,458 meters/second = 9,460,730,472,580,800 meters.
This is not an approximation but an exact number due to the definitions of a Julian year and the speed of light.
Wiki User
∙ 13y ago
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How big is a lightyear in meters?
A light year is a unit of length in space. It is the distance that light travels in a vacuum in one year. Translated to miles it is about 5.9 trillion miles.
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