NASA's Mars rovers, Spirit and Opportunity, have been working overtime to help scientists better understand ancient environmental conditions on the red planet.
NASA's durable twin Mars rovers have successfully explored the surface of the mysterious red planet for a full Martian year (687 Earth days).
Life may have had a tough time getting started in the ancient environment that left its mark in the Martian rock layers examined by NASA's Opportunity rover.
Working atop a range of Martian hills, NASA's Spirit rover is rewarding researchers with tempting scenes filled with evidence of past planet environments.
Engineers and mission managers for NASA's Mars Exploration Rover mission cheered when images from the Martian surface confirmed Opportunity had successfully escaped from a sand trap.
NASA's Mars rover Opportunity is trying to escape from a sand trap, while its twin, Spirit, has been busy finding new clues to a wet and violent early Martian history.
Mars rover engineers are using a testing laboratory to simulate specific Mars surface conditions where NASA's rover Opportunity has spun its wheels in a small dune.
From a ridgeline vantage point overlooking slopes, valleys and plains, NASA's Mars Exploration Rover Spirit has returned its latest color panorama of the martian landscape.
NASA's Mars Exploration Rover Spirit is taking movies of dust devils -- whirlwinds carrying dust -- scooting across a plain on Mars.
NASA has approved up to 18 more months of operations for Spirit and Opportunity
NASA has suspended use of one of the mineral-identifying tools on the Opportunity Mars rover .
On three consecutive days, Opportunity accomplished unprecedented feats of martian motion.
NASA's Spirit rover found a new class of water-affected rock, while its twin, Opportunity, finished inspecting its own heat shield and set a new martian driving record.
Opportunity has found an iron meteorite, the first meteorite of any type ever identified on another planet.
The most dramatic findings so far from NASA's twin Mars rovers -- telltale evidence for a wet and possibly habitable environment in the arid planet's past -- passed rigorous scientific scrutiny for publication in a major research journal.
Operators of NASA's Mars Exploration Rover Opportunity have determined that a proposed route eastward out of "Endurance Crater" is not passable.
All the scientific tools on NASA's two Mars Exploration Rovers are still working well, a full 10 months after Spirit's dramatic landing.
A view of the sundial-like calibration target on NASA's Mars Exploration Rover Spirit is the 50,000th image from the twin rovers that have been exploring Mars since January.
NASA's Mars rover team is working both to resolve an intermittent problem that affects steering on Spirit and also to understand a marked improvement in Opportunity's power supply.
New findings raise the possibility Opportunity's work area was soaked long ago, before it dried and eroded into a wide plain.› View This Video