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Reference.org
Planetary Observer program
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<p>The Planetary Observer program is a cancelled <a href="/facts/Space_exploration/2eKXYVdq">space exploration</a> program designed by <a href="/facts/NASA/TIMCV0yV">NASA</a> to provide cheaper planetary orbiters by using Earth-orbiting satellite components and technology, using solar panels for power, and a common spacecraft bus platform for all Planetary Observer-class probes. Only one spacecraft of this class was eventually constructed—the <i><a href="/facts/Mars_Observer/eyPL7Hgt">Mars Observer</a></i>. </p>