Term comes from trying to pronounce "FTL" as if it had vowels in it. Superluminal: faster than light, from Latin terms for superior ("super") and pertaining to light ("luminal").Relativistic STL flight, say, above 14% c but below 100% c. ![]() Non-relativistic flight, say below 14% c. ![]() In case you were not aware, electromagnetic radiation includes light, infrared rays, ultraviolet rays, radio waves, microwave rays, x-rays, gamma-rays, radar, radio, laser beams and pretty much any other form of energy that can be called "rays". Science fiction commonly uses "lightspeed" as a synonym for c. "Vacuum" is because light and other electromagnetic radiation travels slower in spaces filled with matter, such as water. The standard physics term for " the speed of light in a vacuum" is lower-case letter c. ![]() If you just want the Cliff Notes, read on. If you want all the nitty-gritty details including savage equations with nasty pointed teeth, there is an great scientific paper here.
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