In the Over the Edge series characters have achieved mastery of gravity and use gravity fields in elevators to lift and lower occupants. Gravity waves are also used to push or repel ships and gain acceleration or slow ships down.
LIGO, laser interferometer gravitational-wave observatory, recently reported that scientists have detected gravitational waves. This is a huge step forward in our understanding of gravity and of the universe!
IT'S OFFICIAL: Gravitational waves have been detected, Einstein was right