We could achieve 5%+ C by using nuclear weapons as propulsion (Project Orion). Building a ship in space bigger than the Empire State Bldg. would be a massive un

We could achieve 5%+ C by using nuclear weapons as propulsion (Project Orion). Building a ship in space bigger than the Empire State Bldg. would be a massive undertaking, but we could arrive at a nearby system in the next century. https://en.m.wikipedia.org/wiki/Project_Orion_(nuclear_propulsion) https://en.m.wikipedia.org/wiki/Project_Orion_(nuclear_propu... https://en.m.wikipedia.org/wiki/Nuclear_pulse_propulsion https://en.m.wikipedia.org/wiki/Nuclear_pulse_propulsion