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This observation from NASA's Mars Reconnaissance Orbiter shows enigmatic, shallowly incised valleys, found in some mid- to low-latitude regions on Mars.
This observation from NASA's Mars Reconnaissance Orbiter shows enigmatic, shallowly incised valleys, found in some mid- to low-latitude regions on Mars.

Valleys in Tyrrhena Terra

In the area between Crommelin and Firsoff craters, NASA's Mars Reconnaissance Orbiter saw heavily cratered terrain with deposits that record Martian geologic history and stratigraphy.
In the area between Crommelin and Firsoff craters, NASA's Mars Reconnaissance Orbiter saw heavily cratered terrain with deposits that record Martian geologic history and stratigraphy.

Ridges and a Valley with Flow Fronts

Scientist hypothesize that a lake of liquid water once filled Gale crater, and the layers in the mound formed as sediment settled down through the water to the bottom of the lake in this image from NASA's Mars Reconnaissance Orbiter.
Scientist hypothesize that a lake of liquid water once filled Gale crater, and the layers in the mound formed as sediment settled down through the water to the bottom of the lake in this image from NASA's Mars Reconnaissance Orbiter.

How Did the Mound in Gale Crater Form?

This observation from NASA's Mars Reconnaissance Orbiter shows a sand dune field in the Nili Fossae region of Mars. The dark lines swirling over the surface of the dunes are the tracks of dust devils.
This observation from NASA's Mars Reconnaissance Orbiter shows a sand dune field in the Nili Fossae region of Mars. The dark lines swirling over the surface of the dunes are the tracks of dust devils.

Dust Devil Tracks and Slope Streaks on Martian Sand Dunes

Seasonal flows on warm Martian slopes may be caused by the flow of salty water on Mars, active today when the surface is warm (above the freezing point of the solution). This observation is from NASA's Mars Reconnaissance Orbiter.
Seasonal flows on warm Martian slopes may be caused by the flow of salty water on Mars, active today when the surface is warm (above the freezing point of the solution). This observation is from NASA's Mars Reconnaissance Orbiter.

Seasonal Flows in Palikir Crater

This observation from NASA's Mars Reconnaissance Orbiter Polygons form by the intersecting ridges of sand dunes. The illumination is coming from the upper left, so the bluish ridges are high-standing.
This observation from NASA's Mars Reconnaissance Orbiter Polygons form by the intersecting ridges of sand dunes. The illumination is coming from the upper left, so the bluish ridges are high-standing.

Polygonal Dunes

Today's image captured by NASA's 2001 Mars Odyssey shows a portion of Iani Chaos.
Today's image captured by NASA's 2001 Mars Odyssey shows a portion of Iani Chaos.

Iani Chaos

This image from NASA's 2001 Mars Odyssey image shows a small portion of the southern flank of Alba Mons.
This image from NASA's 2001 Mars Odyssey image shows a small portion of the southern flank of Alba Mons.

Alba Mons

An artist's concept of NASA's Mars Global Surveyor (MGS) flying over Mars.
An artist's concept of NASA's Mars Global Surveyor (MGS) flying over Mars.

Mars Global Surveyor (Artist's Concept)

This image taken by NASA's 2001 Mars Odyssey spacecraft shows a landslide deposit on the southern rim of Candor Chasma.
This image taken by NASA's 2001 Mars Odyssey spacecraft shows a landslide deposit on the southern rim of Candor Chasma.

Candor Chasma Landslide

NASA's Mars Exploration Rover Opportunity took this picture of a rock informally named 'Marquette Island' as the rover was approaching the rock for investigations that have suggested the rock is a stony meteorite.
NASA's Mars Exploration Rover Opportunity took this picture of a rock informally named 'Marquette Island' as the rover was approaching the rock for investigations that have suggested the rock is a stony meteorite.

Approaching 'Marquette Island'

This image from NASA's Mars Reconnaissance Orbiter, shows channels to the southeast of Hale crater on southern Mars. Channels associated with impact craters were once thought to be quite rare.
This image from NASA's Mars Reconnaissance Orbiter, shows channels to the southeast of Hale crater on southern Mars. Channels associated with impact craters were once thought to be quite rare.

Channels from Hale Crater

NASA's 2001 Mars Odyssey image shows a field of individual dunes in an unnamed crater in Aonia Terra.
NASA's 2001 Mars Odyssey image shows a field of individual dunes in an unnamed crater in Aonia Terra.

Dunes in Aonia Terra

NASA's Mars Exploration Rover Opportunity used its navigation camera to take the images combined into this 360-degree stereo view of the rover's surroundings on July 19, 2009. 3D glasses are necessary to view this image.
NASA's Mars Exploration Rover Opportunity used its navigation camera to take the images combined into this 360-degree stereo view of the rover's surroundings on July 19, 2009. 3D glasses are necessary to view this image.

Opportunity's Surroundings on Sol 1950 (Stereo)

This view from the navigation camera on NASA's Mars Exploration Rover Opportunity shows tracks left by backing out of a wind-formed ripple after the rover's wheels had started to dig too deeply into the dust and sand of the ripple.
This view from the navigation camera on NASA's Mars Exploration Rover Opportunity shows tracks left by backing out of a wind-formed ripple after the rover's wheels had started to dig too deeply into the dust and sand of the ripple.

Skirting an Obstacle, Opportunity's Sol 1867

NASA's Opportunity had driven 72.3 meters southward (237 feet) that sol. Engineers drove the rover backward as a strategy to counteract an increase in the amount of current drawn by the drive motor of the right-front wheel. This is a vertical projection.
NASA's Opportunity had driven 72.3 meters southward (237 feet) that sol. Engineers drove the rover backward as a strategy to counteract an increase in the amount of current drawn by the drive motor of the right-front wheel. This is a vertical projection.

Opportunity's View After 72-Meter Drive, Sol 1912 (Vertical)

NASA's Opportunity had driven 62.5 meters (205 feet) that sol, southward away from an outcrop called 'Penrhyn,' which the rover had been examining for a few sols, and toward a crater called 'Adventure.' This is a cylindrical projection.
NASA's Opportunity had driven 62.5 meters (205 feet) that sol, southward away from an outcrop called 'Penrhyn,' which the rover had been examining for a few sols, and toward a crater called 'Adventure.' This is a cylindrical projection.

Opportunity's Surroundings After Backwards Drive, Sol 1850

This image, taken by NASA's Mars Odyssey spacecraft, shows flow features on the northern flank of Olympus Mons.
This image, taken by NASA's Mars Odyssey spacecraft, shows flow features on the northern flank of Olympus Mons.

Olympus Mons

NASA's Mars Exploration Rover Spirit used its navigation camera to take the images that have been combined into this stereo, full-circle view of the rover's surroundings on March 10, 2009. 3D glasses are necessary to view this image.
NASA's Mars Exploration Rover Spirit used its navigation camera to take the images that have been combined into this stereo, full-circle view of the rover's surroundings on March 10, 2009. 3D glasses are necessary to view this image.

Time for a Change; Spirit's View on Sol 1843 (Stereo)

NASA's Mars Exploration Rover Spirit used its navigation camera to take the images that have been combined into this stereo, 180-degree view of the rover's surroundings on Feb. 17, 2009. 3D glasses are necessary to view this image.
NASA's Mars Exploration Rover Spirit used its navigation camera to take the images that have been combined into this stereo, 180-degree view of the rover's surroundings on Feb. 17, 2009. 3D glasses are necessary to view this image.

Spirit's View Beside 'Home Plate' on Sol 1823 (Stereo)

NASA's Mars Exploration Rover Spirit took the images combined to make this stereo view on March 21, 2009. West is at the center, where a dust devil is visible in the distance. 3D glasses are necessary to view this image.
NASA's Mars Exploration Rover Spirit took the images combined to make this stereo view on March 21, 2009. West is at the center, where a dust devil is visible in the distance. 3D glasses are necessary to view this image.

Dust Devil in Spirit's View Ahead on Sol 1854 (Stereo)

NASA's Mars Exploration Rover Opportunity combined images into this stereo, 360-degree view of the rover's surroundings on March 12, 2009. 'Cook Islands' is visible just below center of this image. 3D glasses are necessary to view this image.
NASA's Mars Exploration Rover Opportunity combined images into this stereo, 360-degree view of the rover's surroundings on March 12, 2009. 'Cook Islands' is visible just below center of this image. 3D glasses are necessary to view this image.

Opportunity at 'Cook Islands' (Stereo)

NASA's Mars Exploration Rover Opportunity used its navigation camera to take the images combined into this stereo 180-degree view on March 5, 2009. 3D glasses are necessary to view this image.
NASA's Mars Exploration Rover Opportunity used its navigation camera to take the images combined into this stereo 180-degree view on March 5, 2009. 3D glasses are necessary to view this image.

Opportunity's Surroundings on Sol 1818 (Stereo)

This stereo mosaic of images from NASA's Mars Exploration Rover Opportunity shows surroundings of the rover's location following an 111 meters (364 feet) drive east-northeastward on Feb. 12, 2009. 3D glasses are necessary to view this image.
This stereo mosaic of images from NASA's Mars Exploration Rover Opportunity shows surroundings of the rover's location following an 111 meters (364 feet) drive east-northeastward on Feb. 12, 2009. 3D glasses are necessary to view this image.

Wind-Sculpted Vicinity After Opportunity's Sol 1797 Drive (Stereo)

NASA's Mars Exploration Rover Opportunity combined images into this full-circle view of the rover's surroundings. Tracks from the rover's drive recede northward across dark-toned sand ripples in the Meridiani Planum region of Mars. You need 3D glasses.
NASA's Mars Exploration Rover Opportunity combined images into this full-circle view of the rover's surroundings. Tracks from the rover's drive recede northward across dark-toned sand ripples in the Meridiani Planum region of Mars. You need 3D glasses.

Opportunity's View After Drive on Sol 1806 (Stereo)

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