Project Orion is the most improbable story of powering a spacecraft with Nuclear Energy so that man can take a quantum leap in his quest to explore the unknown space.
The pulse of the Orion craft has the following specifications: The output of this nuclear powered Spacecraft is 1 Kiloton and the weight is approximately 933 kilogrmas, and only 2000 to 3000 such charges will be sufficient if the spacecraft has to make a roundtrip from Earth to Mars.
There are tiny explosions that take place inside the craft and the release of energy is contained inside a radiation shield and is further directed towards the propellant.
via: boingboing
