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LY, light year - The distance travelled by light in one year. Light travels at 300,000 km/sec, so a lighty year is 1 light year = 9.4605284 × 1015 meters. 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)