Full name: light second
Plural form: light seconds
Alternate spelling: lightsecond
Category type: length
Scale factor: 299792458
The SI base unit for length is the metre.
1 metre is equal to 3.33564095198E-9 light second.
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A light-second is a unit of length. It is defined as the distance light travels in an absolute vacuum in one second or 299,792,458 meters. Note that this value is considered exact, since the meter is actually (as of 1983) defined in terms of the light second. It is just over 186,282 miles and almost 109 feet.