Mars Rover Crippled and Blinded as Instruments Fail

NASA's Opportunity rover has been crippled and blinded by problems with two of its most important instruments. The agency has suspended work involving the rover's rock grinding tool and its infrared spectrometer while engineers try to work out a fix.
The problems are the latest in a long line of failures that have begun to plague both rovers as they age.

Opportunity and its twin, Spirit, were designed to last just 90 days. But they have been driving around the Red Planet for nearly 4 years, having landed in January 2004. The rovers' lifetimes were originally expected to be limited by dust accumulating on the panels. If dust reduced harvestable solar power too much, the rovers would have trouble keeping their electronic innards warm enough to survive the cold Martian nights, especially in the winter.

But gusts of wind have cleaned off both rovers' solar panels from time to time, allowing them to weather the coldest nights, says project manager John Callas of NASA's Jet Propulsion Laboratory in Pasadena, California, US. Because of these helpful winds, Callas says he thinks the rovers will be limited more by how long their components can last against wear and tear.