NASA's Mars Rover Curiosity Recovering from Computer Glitch

Mars Rover Curiosity Portrait: John Klein Site
This self-portrait of NASA's Mars rover Curiosity combines dozens of images taken by the rover's Mars Hand Lens Imager on Feb. 3, 2013. The portrait was taken at the rock target "John Klein," where the rover collected the first ever bedrock sample of Mars using its drill on Feb. 8. (Image credit: ASA/JPL-Caltech/MSSS)

NASA's Mars rover Curiosity is on the road to recovery from last week's computer glitch and could be back in action as early as this weekend, mission officials say.

Curiosity went into a protective, minimal-activity "safe mode" last Thursday (Feb. 28) when its handlers swapped the rover over to its backup computer. They made this switch after noticing a problem with the flash memory on Curiosity's primary "A-side" computer.

But the rover's respite may be short-lived. Curiosity came out of safe mode Saturday (March 2) and began using its high-gain antenna again a day later, so the 1-ton robot may soon resume its quest to determine if Mars has ever been able to support microbial life.

"We're out of safe mode and are back with an operable high-gain antenna, which is one of the big steps in the recovery," said Curiosity project manager Richard Cook, of NASA's Jet Propulsion Laboratory in Pasadena, Calif. [Curiosity Rover's Latest Amazing Mars Photos]

Cook cautioned, however, that much work remains to be done. Engineers are still configuring the rover's backup "B-side" computer for surface operations, an activity that should take another few days.

And the Curiosity team still isn't sure what caused the A-side glitch in the first place. They hope to turn the A-side computer on again Wednesday (March 6) or so to take a look, Cook said.

"We really can't tell [the cause of the problem] without turning it on and trying to read the memory locations that look like they were corrupted," Cook told

One possible cause is an impact by a high-energy charged particle called a cosmic ray. Curiosity's gear is radiation-tolerant, but that doesn't mean it's impervious to all such damage.

"We certainly have seen similar types of behavior in other pieces of memory on other missions as well as MSL," Cook said, referencing the official name of the Curiosity rover's $2.5 billion mission, the Mars Science Laboratory.

Cosmic-ray damage is usually transient, he added, so the problem on the A-side may disappear when the computer is cycled back on. Even if the glitch is more permanent, the rover team can probably still "map around it" and bring the A-side back up, giving Curiosity two functional computer systems once again.

"The prospects are very good," Cook said.

If the memory problem on the A-side is not a serious one, Curiosity could resume science operations as soon as this weekend, or perhaps early next week, he added. If the issue is more substantial, the team will have to devise a workaround and reconnoiter after that.

Curiosity landed inside Mars' huge Gale Crater last August, kicking off a two-year surface mission to investigate the habitability of the area. It's already found many signs of past exposure to liquid water, including an ancient streambed. The car-size rover is the most complex and capable robotic explorer ever sent to another world, NASA officials say.

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Mike Wall
Senior Space Writer

Michael Wall is a Senior Space Writer with and joined the team in 2010. He primarily covers exoplanets, spaceflight and military space, but has been known to dabble in the space art beat. His book about the search for alien life, "Out There," was published on Nov. 13, 2018. Before becoming a science writer, Michael worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Michael on Twitter.