A round of applause for one of the most productive planetary missions ever.

Multiple images of Mars taken on a single afternoon in November 2006 by the Mars Observer Camera on the orbiting Mars Global Surveyor spacecraft. The white areas are frost. (NASA/JPL/Malin Space Science Systems)
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Posted December 6, 2006.

Bob Craddock is a geologist with the National Air and Space Museum's Center for Earth and Planetary Studies.

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