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Light year
Unit system astronomical
Unit of length
Unit conversions
1 light year in ... ... is equal to ...
SI unit(s) 9.4607×1015 m
Imperial/US unit(s) 5.8786×1012 mi
Astronomical unit(s) 0.3066 pc

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Light Year
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A light-year is a unit of length used to express astronomical distances. It is about 9 trillion kilometres or 6 trillion miles.

As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the word "year", the term light-year is sometimes misinterpreted as a unit of time.

The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in nonspecialist and popular science publications. The unit usually used in professional astrometry is the parsec.

This article uses material from the Wikipedia article "Light-year", which is released under the Creative Commons Attribution-Share-Alike License 3.0.