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Sunjammer (spacecraft)
''Sunjammer'' (Solar Sail Demonstrator) was a NASA mission intended to demonstrate a solar sail constructed by LGarde, but was cancelled before launch. The largest solar sail made as of 2013, ''Sunjammer'' was named after a 1964 Arthur C. Clarke story of the same name, ''Sunjammer'', in which several solar sails compete in a race across the Solar System. ''Sunjammer'' was slated to launch in January 2015 as the secondary payload of a SpaceX Falcon 9 rocket, along with the Earth observation satellite DSCOVR.〔 Citing a lack of confidence in its contractor’s ability to deliver, the mission was cancelled in October 2014.
==Spacecraft design==
Constructed of Kapton in order to withstand the extreme temperatures of space, ''Sunjammer'' has a width and height of , giving it a total surface area of over and making it the largest solar sail as of 2013. Despite its huge surface area, ''Sunjammer'' has a thickness of only 5 μm, giving it an extremely low weight of about and allowing it to be stored in a space the size of a dishwasher.〔 Once in space, the large surface area of the solar sail would allow it to achieve a thrust of about 0.01 N—roughly the weight of a sugar packet. To control its orientation, and via this its speed and direction, ''Sunjammer'' was to use gimballed vanes (each of which is itself a small solar sail) located at the tips of each of its 4 booms, instead of thrusters, completely eliminating the need for any propellant other than the rays of the Sun.〔
In addition to being a demonstration craft, ''Sunjammer'' was to collect scientific data in its own right. With several instruments to detect various aspects of space weather, ''Sunjammer'' could have eventually become part of a larger network of solar sails studying the Sun, allowing for the creation of a more robust early-warning system for space weather.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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