Are Solar Sails the Future of Space Travel? - 0 views
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Virinchi Tadikonda on 27 Jun 14Innovation is one of the most important factors of space travel. This simple design can turn into something that we can use to potentially travel vast distances.
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But it took a long time for solar sails to go from concept to reality. The first successful demonstration of the propulsion system didn't come until 2010, when Japan's Ikaros probe deployed its 46-foot-wide (14 m) sail and became the first craft ever to cruise through space on the backs of photons.
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The $27 million Sunjammer mission, which takes its name from the Arthur C. Clarke story, will use a sail built by California-based company L'Garde that measures 124 feet (38 m) on a side. The sail, made of an advanced material called Kapton, is just 5 microns (about 0.0002 inches) thick. It weighs less than 70 pounds (32 kilograms) and packs down to the size of a dishwasher, NASA officials have said.
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And some researchers have even higher hopes for solar sails, suggesting that a truly enormous sail —one the size of Texas, for example — could send a spaceship to another star system in just a few centuries. (A space-based laser would have to shine a powerful beam on the sail as the craft moved farther and farther away from the sun, however.)
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Several upcoming missions aim to harness the subtle push of sunlight, using gossamer "solar sails" to cruise through the heavens like boats through the sea.
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A spacecraft equipped with a sail 1,300 feet (400 meters) wide, for example, could travel 1.3 billion miles (2.1 billion kilometers) per year, allowing it to escape the sun's sphere of influence in just a decade or so, according to researchers behind the Interstellar Probe, a NASA concept mission proposed about 15 years ago.