NASA's operations in designing an unmanned airplane to survey the surface of Mars has some in the United States government interested in how such a machine could be used to assist in Earth situations, such as emergencies involving natural disasters. The Defense Advanced Research Projects Agency (DARPA) of the Pentagon has expressed serious interest in the unmanned craft idea. The idea of an unmanned Mars craft has been known at NASA since the 1970s. A variety of issues kept the craft from becoming a realistic concept until recently. If the craft is constructed, it could revolutionize how humans understand the surface of Mars.
Source:
http://www.space.com/businesstechnology/071031-tw-darpa-spyplane.html
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