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The remarkable terrain at the 'center' of Mars (0 degrees latitude and longitude), as seen in this NASA Mars Odyssey image, is called Meridiani Planum. It hosts a rare occurrence of gray crystalline hematite.
The remarkable terrain at the 'center' of Mars (0 degrees latitude and longitude), as seen in this NASA Mars Odyssey image, is called Meridiani Planum. It hosts a rare occurrence of gray crystalline hematite.

Northeastern Meridiani

This image from NASA's Mars Odyssey spacecraft shows old, heavily cratered volcanic terrain in Terra Tyrrhena within the Martian southern highlands.
This image from NASA's Mars Odyssey spacecraft shows old, heavily cratered volcanic terrain in Terra Tyrrhena within the Martian southern highlands.

Terra Tyrrhena

This image from NASA's Mars Odyssey spacecraft shows the region where NASA's Mars Polar Lander was set to land on December 3, 1999. Unfortunately, communications with the spacecraft were lost and never regained.
This image from NASA's Mars Odyssey spacecraft shows the region where NASA's Mars Polar Lander was set to land on December 3, 1999. Unfortunately, communications with the spacecraft were lost and never regained.

Rest In Peace Mars Polar Lander

These Mars Odyssey images show the 'White Rock' feature on Mars in both infrared (left) and visible (right) wavelengths. 'White Rock' is the unofficial name for this landform that was first observed during NASA's Mariner 9 mission in the early 1970's.
These Mars Odyssey images show the 'White Rock' feature on Mars in both infrared (left) and visible (right) wavelengths. 'White Rock' is the unofficial name for this landform that was first observed during NASA's Mariner 9 mission in the early 1970's.

Odyssey/White Rock

This 1997 image from NASA's Mars Pathfinder shows a close up of Sojourner as it placed its Alpha Proton X-Ray Spectrometer (APXS) upon the surface of the rock 'Yogi.'
This 1997 image from NASA's Mars Pathfinder shows a close up of Sojourner as it placed its Alpha Proton X-Ray Spectrometer (APXS) upon the surface of the rock 'Yogi.'

Sojourner & 'Yogi'

NASA's Mars Pathfinder's forward rover ramp can be seen successfully unfurled in this image, taken in stereo by the Imager camera. 3-D glasses are necessary to identify surface detail.
NASA's Mars Pathfinder's forward rover ramp can be seen successfully unfurled in this image, taken in stereo by the Imager camera. 3-D glasses are necessary to identify surface detail.

Forward Ramp in 3-D

Why are these dunes different colors? Sand on Mars is typically dark in tone, as it commonly derived from volcanic rocks like lava flows as shown by NASA's Mars Reconnaissance Orbiter.
Why are these dunes different colors? Sand on Mars is typically dark in tone, as it commonly derived from volcanic rocks like lava flows as shown by NASA's Mars Reconnaissance Orbiter.

Two-Color Dunes in Meridiani 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

Sandwiched between a crater nearly 4 kilometer across and a much larger and older crater over 15-kilometers in diameter is this small impact crater with light-toned material exposed in its ejecta. This image is from NASA's Mars Reconnaissance Orbiter.
Sandwiched between a crater nearly 4 kilometer across and a much larger and older crater over 15-kilometers in diameter is this small impact crater with light-toned material exposed in its ejecta. This image is from NASA's Mars Reconnaissance Orbiter.

Craters within Craters

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

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

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