the Orion design would have worked by dropping small shaped charge fission or thermonuclear explosives out the rear of a vehicle, detonating them 200 feet (60 m) out, and catching the blast with a thick steel or aluminum pusher plate.
Jerry Pournelle, who is acquainted with the project and its ex-team leader Freeman Dyson, has been quoted as saying that a single mission could have provided us with a large permanent moon base. Alternatively, an Orion could reach Pluto and return to Earth inside of a year. In the early 1960s a NASA study proposed a rocket launched hybrid for a Mars round trip.
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