Aka the Dyson Sphere and the 'Orion' spacecraft project among many other things.
BTW, here's an excellent book, for those interested in the history of this science. http://www.amazon.com/Selected-Papers-Quantum-Electrodynamic...
BTW, here's an excellent book, for those interested in the history of this science. http://www.amazon.com/Selected-Papers-Quantum-Electrodynamic...