 The "Medusa" design is a type of nuclear pulse propulsion which has more in common with solar sails than with conventional rockets.It was envisioned by Johndale Solem in the 1990s and published in the "Journal of the British Interplanetary Society" (JBIS).A "Medusa" spacecraft would deploy a large "spinnaker" sail ahead of it, attached by separate independent cables, and then launch nuclear explosives forward to detonate between itself and its sail.