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The formation of 'recurring slope lineae' is a fascinating process on Mars. These RSLs show up in the spring and fade in the winter as seen by NASA's Mars Reconnaissance Orbiter.
The formation of 'recurring slope lineae' is a fascinating process on Mars. These RSLs show up in the spring and fade in the winter as seen by NASA's Mars Reconnaissance Orbiter.

Slope Lineae along Coprates Chasma Ridge

This observation from NASA's Mars Reconnaissance Orbiter is of one many that highlights new discoveries; one of these is that many sand dunes and ripples are moving, some at rates of several meters per year.
This observation from NASA's Mars Reconnaissance Orbiter is of one many that highlights new discoveries; one of these is that many sand dunes and ripples are moving, some at rates of several meters per year.

Migrating and Static Sand Ripples on Mars

This basin in Ceti Mensa, as seen by by NASA's Mars Reconnaissance Orbiter, exposes concentric rings in the sedimentary layers. Dark sand ripples and textures in the bedrock suggesting wind scouring are also apparent.
This basin in Ceti Mensa, as seen by by NASA's Mars Reconnaissance Orbiter, exposes concentric rings in the sedimentary layers. Dark sand ripples and textures in the bedrock suggesting wind scouring are also apparent.

Basin in the West Candor Chasma Layered Deposits

This image shows lava crumpled against the upstream side of an impact crater as seen by NASA's Mars Reconnaissance Orbiter.
This image shows lava crumpled against the upstream side of an impact crater as seen by NASA's Mars Reconnaissance Orbiter.

Lava Against an Impact Crater in Elysium Planitia

Sunlight was just starting to reach the high Northern latitudes in late winter when NASA's Mars Reconnaissance Orbiter's HiRISE camera captured this image of part of the steep scarps around portions of the North Polar layered deposits.
Sunlight was just starting to reach the high Northern latitudes in late winter when NASA's Mars Reconnaissance Orbiter's HiRISE camera captured this image of part of the steep scarps around portions of the North Polar layered deposits.

Diffuse Winter Lighting of the Chasma Boreale Scarp

The white portions of this observation are part of the South Polar residual ice cap, with the sunlight is coming from roughly the bottom of this non-map projected image captured by NASA's Mars Reconnaissance Orbiter.
The white portions of this observation are part of the South Polar residual ice cap, with the sunlight is coming from roughly the bottom of this non-map projected image captured by NASA's Mars Reconnaissance Orbiter.

Polygonal Surface Patterns at the South Pole

Terby Crater, sitting on the northern rim of Hellas Basin, has been filled by sedimentary deposits, perhaps deposited by or in water, as observed by NASA's Mars Reconnaissance Orbiter.
Terby Crater, sitting on the northern rim of Hellas Basin, has been filled by sedimentary deposits, perhaps deposited by or in water, as observed by NASA's Mars Reconnaissance Orbiter.

Sedimentary Bedrock Diversity in Terby Crater

Numerous dark slope streaks mark the rim of this unnamed crater located on the rim of Henry Crater in this image taken by NASA's 2001 Mars Odyssey spacecraft.
Numerous dark slope streaks mark the rim of this unnamed crater located on the rim of Henry Crater in this image taken by NASA's 2001 Mars Odyssey spacecraft.

Dark Slope Streaks

This image, taken by NASA's 2001 Mars Odyssey spacecraft, shows multiple craters with windstreak 'tails.'
This image, taken by NASA's 2001 Mars Odyssey spacecraft, shows multiple craters with windstreak 'tails.'

Windstreaks

NASA's Mars Exploration Rover Opportunity used its navigation camera to take the images combined into this 360-degree cylindrical view of the rover's surroundings on the 1,950th Martian day, or sol, of its surface mission (July 19, 2009).
NASA's Mars Exploration Rover Opportunity used its navigation camera to take the images combined into this 360-degree cylindrical view of the rover's surroundings on the 1,950th Martian day, or sol, of its surface mission (July 19, 2009).

Opportunity's Surroundings on Sol 1950

The tilt of Mars' spin axis (obliquity) varies cyclically over hundreds of thousands of years, and affects the sunlight falling on the poles.
The tilt of Mars' spin axis (obliquity) varies cyclically over hundreds of thousands of years, and affects the sunlight falling on the poles.

Mars Obliquity Cycle Illustration

This view combines more than 500 images taken after NASA's Phoenix Mars Lander arrived on an arctic plain at 68.22 degrees north latitude, 234.25 degrees east longitude on Mars.
This view combines more than 500 images taken after NASA's Phoenix Mars Lander arrived on an arctic plain at 68.22 degrees north latitude, 234.25 degrees east longitude on Mars.

Full-Circle Color Panorama of Phoenix Lander Deck and Landing Site on Northern Mars, Animation

This anaglyph, acquired by NASA's Phoenix Lander on Jun. 19, 2008, shows a stereoscopic 3D view of the Martian surface near the lander. 3D glasses are necessary to view this image.
This anaglyph, acquired by NASA's Phoenix Lander on Jun. 19, 2008, shows a stereoscopic 3D view of the Martian surface near the lander. 3D glasses are necessary to view this image.

Martian Surface as Seen by Phoenix

This anaglyph, acquired by NASA's Phoenix Lander on Jun. 7, 2008, shows a stereoscopic 3D view of the Martian surface near the lander. 3D glasses are necessary to view this image.
This anaglyph, acquired by NASA's Phoenix Lander on Jun. 7, 2008, shows a stereoscopic 3D view of the Martian surface near the lander. 3D glasses are necessary to view this image.

Martian Surface as Seen by Phoenix

The CRISM, a mineral mapping instrument on NASA's Mars Reconnaissance Orbiter, began observing Mars after its lens cover was opened on Sept. 27, 2006.
The CRISM, a mineral mapping instrument on NASA's Mars Reconnaissance Orbiter, began observing Mars after its lens cover was opened on Sept. 27, 2006.

New Spectrometer Begins its Global Map of Mars

NASA's Mars rover Opportunity edged closer to the top of the 'Duck Bay' alcove along the rim of 'Victoria Crater' (overnight Sept. 27 to Sept. 28), and gained this vista of the crater. 3D glasses are necessary to view this image.
NASA's Mars rover Opportunity edged closer to the top of the 'Duck Bay' alcove along the rim of 'Victoria Crater' (overnight Sept. 27 to Sept. 28), and gained this vista of the crater. 3D glasses are necessary to view this image.

'Victoria Crater' from 'Duck Bay' (Stereo)

On Feb. 19, 2005, NASA's Mars Exploration Rover Opportunity had completed a drive of 124 meters (407 feet) across the rippled flatland of the Meridiani Planum region. 3-D glasses are necessary to view this image.
On Feb. 19, 2005, NASA's Mars Exploration Rover Opportunity had completed a drive of 124 meters (407 feet) across the rippled flatland of the Meridiani Planum region. 3-D glasses are necessary to view this image.

Opportunity View on Sol 397 (3-D)

This anaglyph from the base of 'Burns Cliff' in the inner wall of 'Endurance Crater' combines several frames taken by Opportunity's navigation camera during the NASA rover's 280th martian day (Nov. 6, 2004). 3D glasses are necessary to view this image.
This anaglyph from the base of 'Burns Cliff' in the inner wall of 'Endurance Crater' combines several frames taken by Opportunity's navigation camera during the NASA rover's 280th martian day (Nov. 6, 2004). 3D glasses are necessary to view this image.

Along Endurance Crater's Inner Wall (3-D Anaglyph)

This 3-D cylindrical-perspective mosaic was created from navigation camera images that NASA's Mars Exploration Rover Spirit captured on on sol 100. 3D glasses are necessary to view this image.
This 3-D cylindrical-perspective mosaic was created from navigation camera images that NASA's Mars Exploration Rover Spirit captured on on sol 100. 3D glasses are necessary to view this image.

Spirit's View on Sol 100 (3-D)

This image taken by the microscopic imager on NASA's Mars Exploration Rover Spirit shows the powdery soil of Mars in 3-D. 3D glasses are necessary to view this image.
This image taken by the microscopic imager on NASA's Mars Exploration Rover Spirit shows the powdery soil of Mars in 3-D. 3D glasses are necessary to view this image.

Martian Soil in 3-D

This anaglyph from NASA's Mars Exploration Rover, Spirit, shows the rover's lander and, in the background, the surrounding martian terrain. 3D glasses are necessary to view this image.
This anaglyph from NASA's Mars Exploration Rover, Spirit, shows the rover's lander and, in the background, the surrounding martian terrain. 3D glasses are necessary to view this image.

Martian Landscape in 3-D

Dust-covered rocks can be seen in this portion of the 3D image taken by the panoramic camera on NASA's Mars Exploration Rover Spirit. 3D glasses are necessary to view this image.
Dust-covered rocks can be seen in this portion of the 3D image taken by the panoramic camera on NASA's Mars Exploration Rover Spirit. 3D glasses are necessary to view this image.

Shrouded in Dust

This image from NASA's Mars Odyssey spacecraft shows fractures within the volcanic plains south of Elysium Mons.
This image from NASA's Mars Odyssey spacecraft shows fractures within the volcanic plains south of Elysium Mons.

Cerberus Rupes

This image from NASA's Mars Odyssey of lava flows around the large scarp of Olympus Mons reveals textures characteristic of the variable surface roughness associated with different lava flows in this region.
This image from NASA's Mars Odyssey of lava flows around the large scarp of Olympus Mons reveals textures characteristic of the variable surface roughness associated with different lava flows in this region.

Lava Flows around Olympus Mons

Hills abound in this portion of Mars imaged by NASA's Mars Odyssey that shows the Vastitas Borealis region of the high northern plains. These hills are part of Scandia Colles.
Hills abound in this portion of Mars imaged by NASA's Mars Odyssey that shows the Vastitas Borealis region of the high northern plains. These hills are part of Scandia Colles.

Bumpy Terrain

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