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Limits of Classical Space Travel (Art. 4)
The following article is available, free of charge, for download. Your consideration of the
great extent of this research is greatly appreciated.
In 1962 JPL's technical staff made a detailed study of the energy
requirements for interplanetary space
travel throughout the entire
solar system and concluded that the energy requirements were so
high they cannot be achieved even using nuclear propulsion and
enormous launch vehicles larger than the Saturn V launch
vehicle (i.e., it was a physical impossibility). See page 9 of
1962 paper "Nuclear Electric Space-Craft For Unmanned
Planetary and Interplanetary Missions."
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