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→SF and Literary Terms - A Glossariki!
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[[===[[SF and Literary Terms - A Glossariki!]]===]]
; LY, light year: The distance traveled by light in one Earth year. Light travels at 300,000 km/sec, so a light year is [1 light year = 9.4605284 × 1015 meters]. One light second - 300,000 km or the distance light travels in one second