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NASA will launch the largest solar sail in history as soon as next year

Solar sails are all about "propellantless" propulsion — using photons from the Sun (as opposed to an onboard fuel supply) to push a spacecraft through space. Building on the lessons learned from smaller solar sail missions, like NASA's NanoSail-D and JAXA's IKAROS, NASA is gearing up to to launch the biggest solar… » 2/01/13 10:40am 2/01/13 10:40am