The invention of gravity refraction technology was the key to faster than light (FTL) travel as well as anti-gravity (anti-grav) and artificial gravity devices. Gravity refraction is the collection, amplification, reduction, and redirection of gravitic forces.
Grav Rail: A path of stressed space between some pairs of stars which allows for faster acceleration/deceleration. Also known as Einstein-Rosen Bridges, after the physicists who first hypothesized their existence. More colloquially referred to as 'wormholes.' Modern science has yet to identify the cause of these phenomena.