04.08.04 - The Mars Exploration Rovers will work five months beyond their three-month prime mission.
04.05.04 - Spirit has now completed 90 sols (martian "days") of surface operations, allowing mission scientists to check off the rover's last box for mission success.
04.06.04 - Administrator O'Keefe, a Mars rover and others help Disney celebrate the success of Spirit and Opportunity.
04.01.04 - Clues from a wind-scalloped volcanic rock on Mars investigated by NASA's Spirit rover suggest repeated possible exposures to water inside Gusev Crater.
03.18.04 - A major ingredient in small mineral spheres analyzed by NASA's Mars Exploration Rover Opportunity furthers understanding of past water at Opportunity's landing site.
03.08.04 - The eclipse-watching campaign began this month with Opportunity's panoramic camera view of Mars' smaller moon, Deimos.
02.27.04 - Dust gradually obscures the Sun during a blue-sky martian sunset seen in a sequence of newly processed frames from NASA's Mars Exploration Rover Opportunity.
02.20.04 - NASA's Opportunity rover is finding some unexpected things in a martian trench, while Spirit is getting set for its own dig at "Laguna Hollow."
02.12.04 - On February 6, Mars Express orbiter transferred commands from Earth to the rover and relayed data from the robotic explorer back to Earth.› View This Video
02.09.04 - NASA's Spirit rover has begun making some of its own driving decisions while its twin, Opportunity, is presenting scientists with decisions to make about studying small spheres embedded in bedrock, like berries in a muffin.
02.05.04 - NASA's Opportunity rover drove about 3.5 meters (11 feet) toward a rock outcrop in the wall of a small crater on Mars; its twin, Spirit, has successfully reformatted its flash memory
02.04.04 - NASA's Opportunity has examined its first patch of soil in the small crater where it landed and found strikingly spherical pebbles among the mix of particles there.
02.02.04 - Each of NASA's two Mars Exploration Rovers is using its versatile robotic arm for positioning tools at selected targets on the red planet.
02.01.04 - NASA's Mars Exploration Rover Spirit is healthy again, the result of recovery work by mission engineers since the robot developed computer-memory and communications problems 10 days ago.
01.31.04 - NASA's Mars Exploration Rover Opportunity drove down a reinforced fabric ramp at the front of its lander platform and onto the soil of Mars' Meridiani Planum this morning.
01.29.04 - The Mars rover resumed taking pictures as engineers continue work on restoring its health.› View Photo →
01.29.04 - NASA's Opportunity rover has untucked its front wheels and latched its suspension system in place, key steps in preparing to drive off its lander and onto martian soil.
01.27.04 - New pictures from NASA's Opportunity reveal thin layers in rocks just a stone's throw from the lander platform where the rover temporarily sits.
01.25.04 - A 300-million-mile hole in one.
01.25.04 - As if it's a whole different planet.