© NASA/JPL-CALTECH/CORNELL/MSSSThis set of images shows the results from the rock abrasion tool from NASA's Mars Exploration Rover Opportunity (left) and the drill from NASA's Curiosity rover (right). Note how the rock grindings from Opportunity are brownish red, indicating the presence of hematite, a strongly oxidized iron-bearing mineral.
It's official: Primitive life could have lived on ancient Mars, NASA says.

A sample of Mars drilled from a rock by NASA's Curiosity rover and then studied by onboard instruments "shows ancient Mars could have supported living microbes," NASA officials announced Tuesday in a statement and press conference.

The discovery comes just seven months after the Curiosity rover landed on Mars to spend at least two years determining if the planet could have ever supported primitive life.

"A fundamental question for this mission is whether Mars could have supported a habitable environment," said Michael Meyer, lead scientist for NASA's Mars Exploration Program at the agency's headquarters in Washington. "From what we know now, the answer is yes."

Curiosity drilled into a rock on Feb. 8, boring 2.5 inches into an outcrop called John Klein using its arm-mounted hammering drill, going deeper than any robot had ever dug into the Red Planet before. Two weeks later, the rover transferred the resulting gray powder samples into two onboard instruments called Chemistry and Mineralogy (CheMin) and Sample Analysis at Mars, or SAM.

CheMin and SAM identified some of the key chemical ingredients for life in this powder, including sulfur, nitrogen, hydrogen, oxygen, phosphorus and carbon. The fine-grained John Klein rock also contains clay minerals, suggesting a long-ago aqueous environment that was salty and neutral, researchers said - that is to say, a place that likely was habitable.

Analysis of the samples was complicated by a computer glitch that's still affecting Curiosity today.

In late February, Curiosity's handlers determined that a glitch had affected the flash memory on the rover's main, or A-side, computer system. So they swapped the rover over to its backup (B-side) computer, which caused the robot to go into a protective "safe mode" on Feb. 28.

Curiosity emerged from this safe mode on March 2, only to be put on standby briefly once again a few days later to wait out a Mars-bound solar eruption. Full science operations have yet to resume, but Curiosity's B-side computer is working well as engineers continue to work through the mysterious problem with the A-side, team members said.

"These tests have provided us with a great deal of information about the rover's A-side memory," Jim Erickson, Curiosity deputy project manager at NASA's Jet Propulsion Laboratory in Pasadena, Calif., said in a statement. "We have been able to store new data in many of the memory locations previously affected and believe more runs will demonstrate more memory is available."

Engineers plan to upload two software patches later this week, then reassess when full mission operations can resume, officials said.

Curiosity landed inside Mars' huge Gale Crater on Aug. 5, kicking off a two-year prime surface mission to determine if the Red Planet has ever been able to support microbial life. CheMin and SAM are two of the 10 instruments it carries to aid this quest.

While Curiosity has already made a number of interesting discoveries near its landing site - including an ancient streambed where water likely flowed continuously for thousands of years - its main destination is a set of interesting deposits at the base of Mount Sharp, which rises 3 miles from Gale's Center.