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Wikipedia, The New Millennium Program The New Millennium Program was developed to test new missions at a lower cost and risk.
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en.wikipedia.org/wiki/Deep_Space_1 First spacecraft in the New Millenium Program. It was also, the first spacecraft to use solor electric propulsion for thrust.
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http://en.wikipedia.org/wiki/Deep_Space_2 Two penetrator probes sent to Mars for research of the soil. This mission later failed.
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http://eo1.gsfc.nasa.gov/ A spacecraft that used a GPS receiver to control it's orbit.
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http://en.wikipedia.org/wiki/Space_Technology_5
A cluster of 3 satellites, sent to observe Earth's magnetospher. -
http://en.wikipedia.org/wiki/Space_Technology_6 A mission that used a inertial stellar compass which is an advance navigation system.