In his years at Brown University, Dr. Theodore P. Cotter of Los Alamos Scientific Laboratory learned to love sailing in New England waters, and he still sails a folding kayak on Colorado lakes. At Los Alamos he was assigned to N Division, which works on the knotty problem of providing nuclear propulsion for spaceships. He began to think about the great solar "wind," the sun's radiation blowing outward through the solar system, and how this solar wind might be used to drive a space vessel.
The force of the sun's light is extremely small—9X10-5 dynes per square centimeter, or about the weight...
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