A nuclear thermal rocket for manned exploration of Mars, the Moon, or space colonization.
Nuclear electric propulsion using Advanced Thermoelectric Generators (ATEG)s reaching over 20% efficiency.
Water based propulsion for CubeSats providing orbit insertion, station keeping for 10 years, and eventual deorbit.
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Low cost, rapid debris de-orbiting for less than $3k per kilogram of removed mass from Earth orbit.