On this episode of the SpaceGeeks podcast, Dan Leone talks to Jeff Thornburg: a propulsion expert who just capped a five-year stint at SpaceX where he led development of the company’s methane-fueled Mars engine, Raptor.

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Dan Leone is a SpaceNews staff writer, covering NASA, NOAA and a growing number of entrepreneurial space companies. He earned a bachelor’s degree in public communications from the American University in Washington.