Light Year (ly) 2
Light Year (ly) 2 :
A unit of distance used in astronomy. One light year is the distance that light travels in one year through a vacuum (and, of course, most of the Universe is close to being a vacuum). In the official definition of the International Astronomical Union, the light year is based on the Julian year of exactly 365.25 days or 31 557 600 seconds and the defined speed of light c = 299,792,458 meters per second. Thus one light year equals exactly 9 460 730 472 580.8 kilometers, or 9 460 730 472 580 800 meters. One light year is approximately 5.880 trillion miles
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