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1 Light Second =

3.1688088 x 10^{-8} Light Years

(rounded to 8 digits)

A light second is the distance that light travels in one second. It is exactly 299,792.458 kilometers or about 186,000 miles.

A light year is the distance that light travels in one year. The year used by the International Astronomical Union is 365.25 days. Therefore a light year is exactly 9,460,730,472,580.8 kilometers.