1. Headline
  1. Headline
Image: Robotic arm and rock
NASA - JPL - Cornell
A picture taken by Spirit's panoramic camera shows the rover's instrument-laden robotic arm next to the Martian rock nicknamed Adirondack. The rock abrasion tool, or RAT, sticks out toward the right, with an American flag visible on a plate.
By Alan Boyle Science editor
updated 2/6/2004 6:41:52 PM ET 2004-02-06T23:41:52

Scientists declared NASA's Spirit rover completely "healed" on Friday, after the probe suffered computer problems that engineers now say they made worse during their diagnosis. Spirit marked its return to science operations by brushing off the dust from a rock nicknamed Adirondack, revealing a surprisingly dark surface underneath.

Meanwhile, half a world away, the twin Opportunity rover closed in on another geological mystery — an outcropping of Martian bedrock called "Snout." At the end of Friday's workday, the six-wheeled robot geologist was about half a yard (meter) away from its target, and roughly 23 feet (7 meters) from its landing platform.

Spirit and Opportunity are the identical halves of an $820 million mission to determine whether ancient Mars could have had liquid water for a long enough time to support the development of life. After a seven-month journey, Spirit landed Jan. 3 in the 95-mile-wide (150-kilometer-wide) Gusev Crater, and Opportunity came down three weeks later in Meridiani Planum, on the opposite side of Mars.

'Our patient is healed'
Spirit had been crippled for the past two weeks because its flash memory system — a setup similar to that used on digital cameras here on Earth — couldn't handle the size and number of files that were being stored onboard. After diagnosing the problem, engineers had to reboot the system remotely, and mission manager Jennifer Trosper said the rover now appears to be operating normally.

  1. More from TODAY.com
    1. Airline moves passengers to tears with surprise notes from loved ones

      A heartwarming new video from KLM Royal Dutch Airlines captures several weepy sendoffs, and then keeps the tears flowing b...

    2. Can love be blind? 'Paper bag dating' tests how much faces matter
    3. Stray dog befriends athletes, joins them in heartwarming adventure
    4. 5 ways to reinvent cranberries for Thanksgiving
    5. These 14 bundled babes don't care if it's cold outside

"I think I can say this morning with as much certainty as we can say anything here that our patient is healed — and we're very excited about that," Trosper told reporters at NASA's Jet Propulsion Laboratory in Pasadena, Calif. She also reported that Spirit communicated successfully with Europe's Mars Express orbiter, strengthening an "international, interplanetary communication network."

Reviewing Spirit's past failings, flight software architect Glenn Reeves said the memory glitch was a "very serious problem" that was worsened when "we managed to corrupt this file system." He said the memory management issue was not caught during the pre-launch testing process, but a review of the test data turned up hints that storing too many files might create a problem.

"In a sense, we're back to the beginning. ... We have a procedure in place so that we now believe we can work around this problem indefinitely," Reeves said. Additional software fixes may be put in place as the mission continues, he said.

Back to Adirondack
When Spirit suffed its glitch, it was in the midst of analyzing Adirondack, its first target rock. Scientists went ahead with the analysis on Thursday by commanding the rover to use a brush attachment on its rock abrasion tool, or RAT, to clear away any dust on the pyramid-shaped rock's surface.

Honeybee Robotics engineer Stephen Gorevan, who heads the RAT payload team, said he didn't expect the brushing to make any difference, since the rock appeared to be smooth and dust-free. But he and other team members were surprised to find that brushing the rock revealed a darker-colored surface beneath a lighter layer of "sticky" dust.

Slideshow: Images from Mars

“I was asked in the scientific assessment meeting to try to capture this first-time action on Mars, the scientific opportunity created and the elation we felt," he said. "And I could only think of Muhammad Ali ... ‘'Ladies and gentlemen, I present you the greatest interplanetary brushing of all time.’”

Scientists speculated that Martian dust may be stickier than previously thought because of electrostatic attraction — in other words, a cosmic case of static cling.

A close look at the brushed surface strengthens the view that Adirondack was formed through volcanic processes, said the U.S. Geological Survey's Ken Herkenhoff, who heads the science team for the rover's microscopic imager. That means the rock may not shed much new light on the liquid-water question. Nevertheless, the RAT will be used to grind away at Adirondack's surface, giving scientists their first-ever chance to study a rock's interior on Mars.

After that's finished, Spirit is likely to be sent toward a crater 800 feet (250 meters) away — an odyssey that could take several weeks to complete.

Opportunity knocks
Opportunity, meanwhile, will conduct a similar survey of Snout and the rest of the outcropping within the 72-foot-wide (22-meter-wide) crater where it landed Jan. 24. The rover's mini-thermal emission spectrometer already has found ample evidence of hematite, an iron oxide mineral that can form either through interaction with liquid water or through volcanic activity.

Image: Outcropping
A view from Opportunity's navigation camera shows Snout, the outcropping that will be the focus of the Mars rover's research for the next few days. The outcropping rises to a height of about 18 inches (40 centimeters).
Snout, a rock formation that rises no higher than about 18 inches (half a meter), would provide the first-ever opportunity to study Martian bedrock up close. Scientists had hoped Opportunity would reach the rock by Friday, but mission manager Matt Wallace said the rover fell slightly short of the mark — most likely because its six wheels were slipping on the crater's sandy incline.

Due to the distance between Mars and Earth, the rover can't be steered in real time: Instead, it gets its driving instructions during communication sessions, executes those instructions and then reports back the results. As the rover's remote-control drivers get more experience with the terrain, the rover's movements will become more precise, Wallace said.

Each of the rovers was designed for a primary mission lasting 90 days, but mission managers say the solar-powered spacecraft could keep going for a significantly longer time.

© 2013 msnbc.com Reprints

Video: Surprising spot


Discussion comments


More on TODAY.com

  1. Samantha Okazaki / TODAY

    Can love be blind? 'Paper bag dating' tests how much faces matter

    11/24/2014 10:04:19 PM +00:00 2014-11-24T22:04:19
  1. Save these sites and apps for the best Cyber Monday deals

    Looking for the best deals on Cyber Monday? Retailers keep most of their plans super secret but savvy shoppers can still plan ahead by lining up all their links and getting their bookmarks ready.

    11/24/2014 4:07:42 PM +00:00 2014-11-24T16:07:42
  1. Maya Evoy; We Are Not Martha

    5 ways to reinvent cranberries for Thanksgiving

    11/24/2014 8:00:35 PM +00:00 2014-11-24T20:00:35
  1. Aj Mast / AP

    NFL player's touchdown celebration honors daughter born that day

    11/24/2014 11:31:40 PM +00:00 2014-11-24T23:31:40