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LY, light year - : The distance travelled traveled by light in one Earth year. Light travels at 300,000 km/sec, so a lighty light year is [1 light year = 9.4605284 × 1015 meters]. One light second - 300,000 km or the distance light travels in one second
FTL - faster than light.
FTL drive -the drive that enables ships to cross interstellar distances fast than light would (so in a relatively short time)