After working on SpaceX's Starship and America's return to the Moon, Halen Mattison left to solve a key problem for a multi-planetary future: building a gas station on Mars. His breakthrough is a propulsion system that uses electrolysis to split water into hydrogen and oxygen—one of the most efficient chemical rocket fuels known. In this episode, we explore how this technology offers a safer, more powerful alternative to legacy fuels, unlocks the lunar economy by using water from the Moon, and will help humanity explore the solar system faster than you think.