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Memory Beta, non-canon Star Trek Wiki
Memory Beta, non-canon Star Trek Wiki
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Light-year

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A light-year (LY) is a unit of distance measurement based on the travel of light energy, undisturbed in a vacuum, over the course of one Earth year.

History and specifics[]

A light year is about 9.5 quadrillion meters long.

The first mention of light-years in Star Trek was in the pilot episode "Where No Man Has Gone Before", referring to the half light-year (0.5LY) that the Valiant traveled past the galactic barrier. The episode also made use of light-days as a unit of measure for the journey to Delta Vega.

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