A concept to provide low Earth orbit (LEO) propellant depots that could be used as way-stations for other spacecraft to stop and refuel on the way to beyond-LEO missions has proposed that waste gaseous hydrogen—an inevitable byproduct of long-term liquid hydrogen storage in the radiative heat environment of space—would be usable as a monopropellant in a solar-thermal propulsion system.
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The fast development time is due in part to the novel use of repurposed SCUBA air tanks and a rocket engine that uses cold gas, in place of a conventional fuel/oxidizer or monopropellant engine.