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$820 million. Because NASA had no communication with Polar Lander during its descent, the team had very little telemetry to work with to recreate the failure. As a result of these and other changes, the price tag for the Mars Exploration Rovers rose by about 15 percent, or $100 million, to about $820 million. (http://www.space.com/spacenews/businessmonday_040112.html)
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