General Galactic, cofounded by a former SpaceX engineer, plans to test its water-based propellant this fall. If successful, it could help usher in a new era of space travel. That's a big “if.” ...

For over a century, rocket propulsion has followed a simple principle; burn fuel, expel it backward, and Newton's third law pushes you forward. Since Konstantin Tsiolkovsky first formulated the rocket ...

Plasma engines could be the future of human space travel, and Russia’s “manetoplasma rockets” have the most ambitious travel goals ...

Artificial intelligence is moving from the control room into the engine bell, reshaping how rockets are designed, steered and powered. Instead of treating propulsion as a fixed piece of hardware, ...