Mars Rover Page

The two Mars Exploration Rovers (MER), Opportunity and Spirit, have been on Mars since January of 2004. Their most important finding was that there must have been abundant water on the Martian surface in the past. The waters certainly have filled shallow lake basins, but may also have formed entire ocean basins. A lot of the MER mission press releases have been posted on the following web site:,     

here is a link to a little movie clebrating the first year of the rovers:

the key press release, pertaining to evidence for standing water, is posted here.

this press release shows concretions that grew in sediment pore waters

this press release was the first to show evidence for abundant salty water in pore spaces of sediments

The following pictures show vistas of the Martian surface taken by the Opportunity Rover.

NASA's Mars Exploration Rover Opportunity captured this view of "Burns Cliff" after driving right to the base of the southeastern portion of the inner wall of "Endurance Crater." The view combines frames taken by Opportunity's panoramic camera between the rover's 287th and 294th martian days (Nov. 13 to 20, 2004).
This is a composite of 46 different images, each acquired in seven different Pancam filters. It is an approximately true-color rendering generated from the panoramic camera's 750-nanometer, 530-nanometer and 430-nanometer filters. The mosaic spans more than 180 degrees side to side. Because of this wide-angle view, the cliff walls appear to bulge out toward the camera. In reality the walls form a gently curving, continuous surface.
Opportunity safely exited Endurance Crater on December 12, 2004 (sol 315) after a six-month investigation inside. Opportunity is once again on the plains of Meridiani Planum and will attempt to travel farther into the unknown.

8/6/2004 As NASA's Mars Exploration Rover Opportunity crept farther into "Endurance Crater," the dune field on the crater floor appeared even more dramatic. This false-color image taken by the rover's panoramic camera shows that the dune crests accumulated more dust than the flanks of the dunes and the flat surfaces between them. Also evident is a "blue" tint on the flat surfaces as compared to the dune flanks. This results from the presence of the hematite-containing spherules ("blueberries") that accumulate on the flat surfaces.
Sinuous tendrils of sand less than 1 meter (3.3 feet) high extend from the main dune field toward the rover. Scientists wanted to send the rover down to one of these tendrils in an effort to learn more about the characteristics of the dunes. Dunes are a common feature across the surface of Mars, and knowledge gleaned from investigating the Endurance dunes close-up may have applied to similar dunes elsewhere. Rover drivers discovered that the slippery slope that led to the dunes was not firm enough to ensure a successful drive back out of the crater, and the dune field may have been a true sand trap, so Opportunity ultimately did not cruise around too close to the dunes.

Iron Meteorite on Mars
NASA's Mars Exploration Rover Opportunity has found an iron meteorite on Mars, the first meteorite of any type ever identified on another planet. The pitted, basketball-size object is mostly made of iron and nickel. Readings from spectrometers on the rover determined that composition. Opportunity used its panoramic camera to take the images used in this approximately true-color composite on the rover's 339th martian day, or sol (Jan. 6, 2005).