Startup Portal Space Systems aims to use mirrors to heat ammonia propellant for high delta-v maneuvers.
Credit: Portal Space System
If you want to go fast—and far—in space, the consensus is that you have to go nuclear. The U.S. Space Force, DARPA and NASA in recent years have funded several nuclear propulsion development efforts they believe could make spacecraft rapidly maneuverable around Earth or efficient for long-distance...
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