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Methane is all the rage In the past, most large liquid-fueled rockets have used kerosene, hydrogen, or hydrazine as fuel. Hydrazine is toxic and has fallen out of favor for use in large rockets ...
But oxygen is typically the heavier component of rocket fuel combinations—typically about 80 percent of the mass—and so, is the bigger challenge to get to a fuel depot.) ...
NTP was first theorized in the 1940s. Instead of burning chemical propellant, a rocket would use a nuclear reactor to heat propellant – most likely hydrogen.
First conceived of in 1945, this is a rocket that replaces burning chemical fuel with a nuclear reactor that is used to heat up a propellant. This propellant is most likely hydrogen, though ...
No hydrogen-oxygen rocket of appreciable size has flown so far, but for a year Aerojet-General Corp. has been ground-testing hydrogen rocket motors at its Sacramento plant.