Nuclear propulsion is a theoretical
possibility for traveling much faster than ion propulsion or
gravitational slingshotting. Project Orion began in 1958, inspired
during the early stages of development of the atomic bomb.
Interplanetary space travel utilizing the power of pulsed nuclear
explosions would provide a huge thrust with a very high specific
impulse. Maximum energy could be extracted from a starship's fuel to
minimize the cost and maximize the range. This would produce a speed
of about 5% the speed of light. Using nuclear propulsion, a starship
could travel the 4.3 light year distance from earth to Proxima
Centauri in only 85 years! However, Project Orion was canceled when
considering that huge amounts of radioactive waste would be pumped
into space.
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