Mars Exploration Rovers
 

While humans' lives unfolded on Earth, NASA's Mars Exploration Rover Opportunity paused in its southward trek and captured this photomosaic around 15:00 local Mars time on May 2, 2010. The timing for this photography with Opportunity's panoramic camera (Pancam) was coordinated with a
 
 
Two Worlds, One Sun
This false-color image shows the rock
 
 
Opportunity at a Sweet Spot on Mars
NASA's Mars Exploration Rover Opportunity examined a rock called
 
 
Sample from Deep in Martian Crust: 'Marquette Island'
This view of a rock called
 
 
'Block Island' Meteorite on Mars, Sol 1961 (False Color)
Composition measurements by Opportunity confirm that this rock on the Martian surface is an iron-nickel meteorite. Researchers have informally named the rock
 
 
'Block Island' Meteorite on Mars, Sol 1961
The soft soil exposed when wheels of NASA's Mars Exploration Rover Spirit dug into a patch of ground dubbed
 
 
Variations in Soft Soil of 'Troy' (False Color)
Spirit slipped in soft ground during short backward drives on the 1,886th and 1,889th Martian days, or sols, of the rover's mission on Mars (April 23 and 26, 2009). Spirit used its front hazard-avoidance camera after driving on Sol 1889 to get this wide-angle view, which shows the soil disturbed by the drives.

Spirit drove 1.11 meters (3.6 feet) on Sol 1889 and 1.68 meters (5.5 feet) on Sol 1886. The rover drags its right front wheel, which no longer rotates. For scale, the distance between the wheel tracks is about 1 meter (40 inches).

This view is looking northward, with Husband Hill on the horizon.

Credit: NASA/JPL-Caltech
 
 
Spirit Slipping in Soft Ground, Sol 1889
Spirit used its navigation camera to capture this view of the terrain toward the southeast from the location Spirit reached on the 1,871st Martian day, or sol, of the rover's mission on Mars (April 8, 2009). The mound on the horizon in the upper left is informally called
 
 
'Von Braun' Mound in Spirit's Drive Direction
Spirit acquired this mosaic on the mission's 1,202nd Martian day, or sol (May 21, 2007), while investigating the area east of the elevated plateau known as
 
 
Rover's Wheel Churns Up Bright Martian Soil (False Color)
Spirit acquired this mosaic on the mission's 1,202nd Martian day, or sol (May 21, 2007), while investigating the area east of the elevated plateau known as
 
 
Rover's Wheel Churns Up Bright Martian Soil (Vertical)
Spirit acquired this mosaic on the mission's 1,202nd Martian day, or sol (May 21, 2007), while investigating the area east of the elevated plateau known as
 
 
Rover's Wheel Churns Up Bright Martian Soil
This mosaic of frames from the navigation camera on NASA's Mars Exploration Rover Opportunity gives a view to the northeast from the rover's position on its 1,687th Martian day, or sol (Oct. 22, 2008).

By that date, Opportunity had driven southwestward from Victoria Crater, beginning a long trek toward a larger crater, Endeavour.

Credit: NASA/JPL-Caltech
 
 
View from Southwest of Victoria Crater
This view from NASA's Mars Exploration Rover Opportunity shows bedock within a stratigraphic layer informally named
 
 
Opportunity View of 'Gilbert' Layer (False Color)
This view from Opportunity shows bedrock within a stratigraphic layer informally named
 
 
Opportunity View of 'Lyell' Layer (False Color)
Spirit has this view northward from the position at the north edge of the
 
 
View from Spirit's Overwintering Position (False Color)
This sequence of Mars Reconnaissance Orbiter (MRO) Mars Color Imager (MARCI) daily mosaics shows some of the dust storm activity that occurred near the Mars Exploration Rover (MER) Opportunity landing site between 21 June 2007 and 18 July 2007.

Credit: NASA/JPL/MSSS
 
 
Series of Storms Shrouds Mars in Dust
The two maps are mosaics of images acquired by the Mars Reconnaissance Orbiter (MRO) Mars Color Imager (MARCI) on two days separated by about 3 and a half weeks. The first, on 22 June, shows that there was a dust storm occurring near the east end of the Valles Marineris trough system. This was the first in the series of storms. The second mosaic shows how Mars appeared on 17 July, after dust was lofted high into the atmosphere by several regional storms and countless smaller, local dust storms.

Credit: NASA/JPL/MSSS
 
 
Series of Storms Shrouds Mars in Dust
This image is a time-lapse composite where each horizon-survey image has been compressed horizontally (but not vertically) to emphasize the sky. The relative brightness and darkness of the sky from sol to sol (over a 30-sol period beginning June 14, 2007) is depicted accurately in these images, which view roughly the same part of the plains southwest of the rover.

Credit: NASA/JPL-Caltech/Cornell
 
 
Dust Storm Time Lapse Shows Opportunity's Skies Darken
A shallow trench made by Spirit's dragging right front wheel uncovered some of the best evidence Spirit has found for ancient water-rich environments in Gusev Crater -- bright patches of almost pure, fine-grained silica (SiO2). On ancient Earth, warm, evaporating coastal waters deposited fine silica in shallow sediments. In Yellowstone National Park, hot, mineral-laden waters deposit fine-grained silica around geysers and hot springs. The discovery of silica-rich deposits on Mars adds compelling new evidence of ancient environments that might have been favorable for life.

Spirit acquired this false-color view of the remarkable, light-colored soil patch with the panoramic camera on the rover's 1,198th sol, or Martian day of exploration (May 17, 2007), more than three years after landing on Mars.

Credit: NASA/JPL-Caltech/Cornell
 
 
Evidence of A Wet Martian Past
Spirit has found a patch of bright-toned soil so rich in silica that scientists propose water must have been involved in concentrating it.

The silica-rich patch, informally named
 
 
Silica-Rich Soil Found by Spirit
Spirit has found a patch of bright-toned soil so rich in silica that scientists propose water must have been involved in concentrating it.

The silica-rich patch, informally named
 
 
Silica-Rich Soil in Gusev Crater
The lower coarse-grained unit shows granular textures toward the bottom of the image and massive textures. Also shown in this false-color view is a feature interpreted to be a
 
 
Evidence of Volcanic Explosion
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