Re:LightSail 2 Spacecraft Successfully Demonstrates Flight b...
by mkl on Thursday August 01, 2019 @07:53AM
(#20582975)
There are key differences with that: either the photons are shot backwards (like a rocket), or the source of the photons is not on the ship itself. ("The limitations posed by the rocket equation can be overcome, as long as the reaction mass is not carried by the spacecraft.")
It's a real idea, but you would need a truly ridiculous amount of electricity available on a spacecraft. Only possible by a huge nuclear reactor. Doesn't violate any laws of physics.