13 December 2004, 04:00 PM ET
SAN FRANCISCO - NASA's Mars rovers have returned new evidence for past water, pictures of Earth-like clouds seen for the first time from the planet's surface, and a rock that doesn't look like anything scientists have ever seen.
02 December 2004, 02:00 PM ET
The success of NASA's Mars rover Opportunity in finding tell-tale signs of past water at its Meridiani Planum landing site has left some researchers believing the region could have once been a habitable, albeit hostile, environment.
11 November 2004, 06:00 PM ET
NASA's Mars rover Opportunity will back its way out of a crater it has spent four months exploring after reaching terrain that appears too treacherous to tread.
27 October 2004, 11:26 AM ET
Those work-a-day robots – Spirit and Opportunity – remain steadfast in their Mars research duties.
21 October 2004, 06:41 PM ET
A steering problem that plagued NASAï¿½s Spirit Mars rover driving abilities has resurfaced almost two weeks after it first appeared.
15 October 2004, 06:47 AM ET
There is mounting evidence of the role of water in Mars’ evolution. That fact appears to have been favorable to the development of life -- and the leftover calling card of past biology may be preserved in that world’s geologic record.
07 October 2004, 04:00 PM ET
NASA's Mars rover Opportunity has found - almost by accident - a rock that may point to a second water event in the red planet's past. Meanwhile, it's robotic twin Spirit on the other side of the planet has overcome its recent steering glitch.
04 October 2004, 05:30 AM ET
The researchers and engineers behind NASA's double rover mission to Mars have been given a reprieve of sorts, the chance to work from home during the next six months of their extended expedition.
28 September 2004, 07:09 AM ET
The image shows a dark dot identified as the rover Spirit next to giant Bonneville Crater and the thin dark line, its tracks.
08 September 2004, 03:36 PM ET
NASA's Mars rover Opportunity found evidence for a lake or sea on Mars, and new research suggests the body of water was deep, large and long-lasting.
18 August 2004, 04:30 PM ET
The Mars rover Spirit, while some showing signs of age, has found signs that water once flowed atop the rocks of its Gusev Crater landing site. The Opportunity rover, at the bottom of Endurance Crater, has found a mysterious rock and a batch of red spheru
09 August 2004, 04:00 AM ET
A future astronaut traipsing across the landing sites of the Mars Exploration Rovers - Spirit and Opportunity ï¿½ might be squishing into a welcome mat of microbes, according to one NASA scientist.
06 August 2004, 09:45 AM ET
04 August 2004, 07:04 PM ET
Both of NASA's Mars rovers experienced problems this week as they enter unknown engineering territory, operating well beyond their what the original blueprints called for.
17 February 2004, 02:00 PM ET
Water was common across a vast region of ancient Mars, creating habitable conditions for long stretches of time billions of years ago, scientists said Thursday.