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"What is a solar sail? How can you use sunlight to move a spacecraft in outer space? In this article, HowStuffWorks will show you how solar sail technology works, take an in-depth look at the Cosmos-1 mission and find out what solar-sails mean for future space travel."^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/solarsail4.htm>