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Sources:
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20000096503.pdf
http://www.businessinsider.com/project-orion-nuclear-bomb-propelled-spaceships-2015-6
http://galileo.phys.virginia.edu/classes/109.jvn.spring00/nuc_rocket/Dyson.pdf
http://history.nasa.gov/sputnik/
http://www.webcitation.org/5uzTHJfF7
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19760065935.pdf