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contains information on solar sails, spacecraft that are pushed through space by sunlight, using very large and lightweight mirrors.
http://www.solarsails.info/
students from five universities across the U.S. working in joint partnership to develop solar sail deployment and nanosatellite designs.
http://www.solarvision.org/
provides information on solar sails and their design and propulsion in six languages.
http://www.u3p.net/