thumb|Modern Pulsed Fission Propulsion ConceptBased on work in the late 1950s to the early 1960s, it has been technically possible to build spaceships with nuclear pulse propulsion engines, i.e. driven by a series of nuclear explosions. This propulsion system contains the prospect of very high specific impulse and high specific power.
thumb|Modern Pulsed Fission Propulsion ConceptBased on work in the late 1950s to the early 1960s, it has been technically possible to build spaceships with nuclear pulse propulsion engines, i.e. driven by a series of nuclear explosions. Th.is propulsion system contains the prospect of very high specific impulse and high specific power