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...many successful firings, American nuclear rockets did not fly before the [[space race]] ended. ...et|Pewee 2]].<ref name="dewar"/> Tests of the improved Pewee 2 design were cancelled in 1970 in favor of the lower-cost Nuclear Furnace (NF-1), and the U.S. nuc ...

{{Short description|Brazilian space project}} | outcome = Project cancelled due to media and popular pressure. ...

{{short description|Space exploration using nuclear energy}} ...Radioisotope Heater Units|publisher = U.S. Department of Energy, Office of Space and Defense Power Systems|date = December 1998|url = http://saturn.jpl.nasa ...

...ag.com/flight-today/hot-rod-helicopters-39130976/?page=3 Page 3] ''[[Air & Space/Smithsonian]]'', September 2009. Accessed: 18 May 2014.</ref><ref name=nelm ...gh pre-production prototypes were ordered the program met problems and was cancelled.<ref>Munson 1973. pp.55,144-5.</ref> {{convert|212|kn|mph km/h}}.<ref>Landi ...

{{Short description|Space service branch of the U.S. military}} {{redirect|Semper Supra|the official march of the United States Space Force|Semper Supra (march)}} ...