How have NASA's Mars robots lasted 24 times longer than expected (so far)?

With a life expectancy of three months, the Spirit and Opportunity robotic vehicles are still in service six years later

NASA’s Spirit and Opportunity Mars Rovers are the Energizer Bunnies of outer space; both are still operational after six years, after only being expected to run for 90 days.

Even though the robotic vehicles have shown exceptional longevity in the field, their capabilities would be quickly outpaced by humans on Mars, Steve Squyres, principal investigator of NASA’s Mars Exploration Rover Mission, said at a seminar today sponsored by Federal Computer Week.

“I am a robots guy, but what the Mars Rovers have done in six years a human could do in a week,” Squyres said. When asked whether he would he volunteer for the job, Squyres answered, “In a heartbeat.”

According to Squyres, the Rovers owe their longevity to cautious testing and engineering while in development. “We used no new technologies, only proven technologies,” he said. “And we were very, very cautious in our parts selection, assembly and testing.”


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However, the Rovers’ software is a different story. Some of the programs for moving and operating the Rovers was developed during the five months while the vehicles were on the way to Mars, he said.

NASA also benefited from an unanticipated stroke of luck because winds have been regularly blowing dust and debris from the Rovers' solar panels, prolonging their usefulness, Squyres added.

NASA has spent more than $900 million on the missions of the Rovers. One of the most heralded discoveries so far is that Mars once had abundant water. However, no evidence has been found yet of biological life there, which most likely would have been microbes, Squyres said.

Currently, Opportunity is moving over sand dunes to the 14-mile-wide Endeavour Crater. The Rovers already have explored a number of craters and rock formations, discovering pebble-like hematite and a deposit of pure silica.

About the Author

Alice Lipowicz is a staff writer covering government 2.0, homeland security and other IT policies for Federal Computer Week.

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Reader comments

Fri, Jul 2, 2010 Alice Lipowicz

Thank you for your comments about the "solar winds." The article was corrected to remove that reference.

Fri, Jul 2, 2010 Scott Hanley

Yes, a human could do more science, and quicker. But how much more would that mission cost? Could the human really outperform the 50 or so robotic missions we can send for the same amount of money?

Thu, Jul 1, 2010 Gene

The copy I'm reading simply says "winds". Be that as it may, NASA has certainly gotten their money's worth out of Spirit and Opportunity, the little rovers that could!

Thu, Jul 1, 2010 Frank

Good article but did Squyres really say "solar winds have been regularly blowing dust and debris from the Rovers' solar panels"? The winds are Martian not solar. Solar winds do not penetrate the atmosphere.

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