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 set aside by NASA and turning into high-powered propulsion for the next generation of spacecraft. Portal, founded in 2021, announced a $50 million Series A funding round Thursday that values the company at $250 million. The round was led by Geodesic Capital and Mach33, alongside Booz All…
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