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An impact crater in Isidis Planitia observed for a fifth time by NASA's Mars Reconnaissance Orbiter.
An impact crater in Isidis Planitia observed for a fifth time by NASA's Mars Reconnaissance Orbiter.

Feathery Ridges

This image from NASA's Mars Reconnaissance Orbiter shows features commonly found in dusty areas: impacts, slope streaks and bed-forms.
This image from NASA's Mars Reconnaissance Orbiter shows features commonly found in dusty areas: impacts, slope streaks and bed-forms.

Touring a Dusty Region

This fascinating observation from NASA's Mars Reconnaissance Orbiter shows us a dark-toned mound with pits inside an impact crater.
This fascinating observation from NASA's Mars Reconnaissance Orbiter shows us a dark-toned mound with pits inside an impact crater.

A Dark-Toned, Pitted Mound in a Crater in Northeast Arabia Terra

This image, acquired by NASA's Mars Reconnaissance Orbiter, in southern winter over part of Asimov Crater, shows the crater appears to have been completely filled by a thick sequence of materials, perhaps including sediments and lava flows.
This image, acquired by NASA's Mars Reconnaissance Orbiter, in southern winter over part of Asimov Crater, shows the crater appears to have been completely filled by a thick sequence of materials, perhaps including sediments and lava flows.

Bedrock in a Trough in Asimov Crater

Many valleys occur all over Mars that reveal an extensive ancient history of liquid water erosion. This image from NASA's Mars Reconnaissance Orbiter shows a complex valley network near Idaeus Fossae.
Many valleys occur all over Mars that reveal an extensive ancient history of liquid water erosion. This image from NASA's Mars Reconnaissance Orbiter shows a complex valley network near Idaeus Fossae.

A Complex Valley Network Near Idaeus Fossae

When impact craters are formed, the material that once resided in the subsurface is blown upward and outward, as seen in this observation from NASA's Mars Reconnaissance Orbiter.
When impact craters are formed, the material that once resided in the subsurface is blown upward and outward, as seen in this observation from NASA's Mars Reconnaissance Orbiter.

Ejecta in Excess

NASA's Mars Reconnaissance Orbiter shows light-toned deposits along Coprates Chasma slopes.
NASA's Mars Reconnaissance Orbiter shows light-toned deposits along Coprates Chasma slopes.

Light-Toned Deposits along Coprates Chasma Slopes

This image from NASA's Mars Reconnaissance Orbiter shows an unusual landform on the floor of Oxus Patera. Oxus Patera is an ancient, eroded depression in northern Arabia Terra.
This image from NASA's Mars Reconnaissance Orbiter shows an unusual landform on the floor of Oxus Patera. Oxus Patera is an ancient, eroded depression in northern Arabia Terra.

Oxus Patera Collapse Feature

Straight and meandering thin ridges are periodically found on Mars. Such ridges can form in a variety of ways, as seen in this image from NASA's Mars Reconnaissance Orbiter.
Straight and meandering thin ridges are periodically found on Mars. Such ridges can form in a variety of ways, as seen in this image from NASA's Mars Reconnaissance Orbiter.

Linear Ridges

This image from NASA's Mars Reconnaissance Orbiter was planned to search for gully activity in the Northern Hemisphere.
This image from NASA's Mars Reconnaissance Orbiter was planned to search for gully activity in the Northern Hemisphere.

Frosted Impact Crater in Late Northern Winter

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

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