you are totally correcdt on that one.. Project Orion (using nuclear bombs to power a spacecraft) and NERVA (Nuclear Engine for Rocket Vehicle Application) are unrelated?
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Nuclear rockets are already a part of history. Two nuclear propulsion projects, Orion and NERVA, were actively pursued by the United States government during the Cold War, and even got to the point of test flights and engine firings.
Project Orion
Project Orion is the more well known of the two nuclear rocket projects, and has a number of proponents to this day. It is also one of those ideas that, at first, sounds completely insane. Even the most wide-eyed space enthusiasts tend to stutter and cough a bit at the prospect of getting into orbit by having a very real nuclear bomb touch off a hundred meters under their feet.
NERVA
Somewhat more conventional nuclear-powered rockets had been studied in one form or another for over 50 years, going back to the musings of the scientists struggling to build the first atomic bombs at Los Alamos. A program called NERVA (Nuclear Engines for Rocket Vehicle Applications) tested solid-core nuclear rocket concepts from 1961 to 1971, under a joint venture by the Atomic Energy Commission and NASA."