Portal’s heat exchanger thruster, known as Flare, fires up during a test in a vacuum chamber. (Portal Space Systems Photo) Bothell, Wash.-based Portal Space Systems says it has successfully tested its ...

Jeff Thornburg helped turn a government research project into SpaceX’s most powerful rocket engine. Now, he’s trying to do the same thing at his startup Portal Space Systems, which is taking an idea ...

Scientists studied how space junk moved in orbit over a 36-year span, finding that increased solar activity caused it to fall ...

Rotating detonation rocket engines work differently than traditional rockets to maximize thrust while using less fuel—an ...