A version of this article appears in the September 8 issue of Aviation Week & Space Technology. Scientists and spacecraft controllers in Denver, Bangalore and many points in between are preparing for a rush of activity at the planet Mars, where two new spacecraft designed to study its atmosphere will arrive later this month, followed shortly thereafter by a rare Oort Cloud comet. If all goes as planned, the two orbiters and the comet Siding Spring should add volumes to human knowledge ...


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