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In this observation from NASA's Mars Reconnaissance Orbiter made for a study of ancient craters, we see the craters filled with smooth material that has subsequently degraded into scallops. These formations might be possibly due to ground ice sublimation.
In this observation from NASA's Mars Reconnaissance Orbiter made for a study of ancient craters, we see the craters filled with smooth material that has subsequently degraded into scallops. These formations might be possibly due to ground ice sublimation.

Filled Crater and Scallops

This image from NASA's Mars Reconnaissance Orbiter shows several seemingly active gullies and their associated fans near the Argyre region.
This image from NASA's Mars Reconnaissance Orbiter shows several seemingly active gullies and their associated fans near the Argyre region.

Gullies Old and New Near the Argyre Region

This region of linear, intersecting ridges near the south pole is called Angustus Labyrinthus, as shown in this image captured by NASA's 2001 Mars Odyssey spacecraft.
This region of linear, intersecting ridges near the south pole is called Angustus Labyrinthus, as shown in this image captured by NASA's 2001 Mars Odyssey spacecraft.

Angustus Labyrinthus

This image captured by NASA's 2001 Mars Odyssey spacecraft shows part of Aspledon Undae, a region of dunes near the north pole. The right side of the image shows hundreds of small, isolated dunes.
This image captured by NASA's 2001 Mars Odyssey spacecraft shows part of Aspledon Undae, a region of dunes near the north pole. The right side of the image shows hundreds of small, isolated dunes.

Aspledon Undae

This image NASA's Mars Reconnaissance Orbitershows a prominently stratified transect through the rock of a mountain of material in the middle of Hebes Chasma.
This image NASA's Mars Reconnaissance Orbitershows a prominently stratified transect through the rock of a mountain of material in the middle of Hebes Chasma.

A Revealing Landslide in Hebes Chasma

This complex graben is part of Labeatis Fossae. This image was captured by NASA's 2001 Mars Odyssey spacecraft.
This complex graben is part of Labeatis Fossae. This image was captured by NASA's 2001 Mars Odyssey spacecraft.

Labeatis Fossae

This image captured by NASA's 2001 Mars Odyssey spacecraf shows a portion of Patapsco Vallis, located on the eastern margin of the Elysium volcanic complex.
This image captured by NASA's 2001 Mars Odyssey spacecraf shows a portion of Patapsco Vallis, located on the eastern margin of the Elysium volcanic complex.

Patapsco Vallis

Numerous channels dissect the rim of this large crater located on Acheron Fossae as seen by NASA's 2001 Mars Odyssey spacecraft.
Numerous channels dissect the rim of this large crater located on Acheron Fossae as seen by NASA's 2001 Mars Odyssey spacecraft.

Crater Rim Channels

This image from NASA's 2001 Mars Odyssey shows the central portion of the complex caldera at the summit of Olympus Mons.
This image from NASA's 2001 Mars Odyssey shows the central portion of the complex caldera at the summit of Olympus Mons.

Olympus Mons Summit

This image from NASA's 2001 Mars Odyssey spacecraft shows part of the large deposit on the floor of Nicholson Crater.
This image from NASA's 2001 Mars Odyssey spacecraft shows part of the large deposit on the floor of Nicholson Crater.

Nicholson Crater

This image from NASA's 2001 Mars Odyssey spacecraf shows part of the southern flank of Ascraeus Mons. Large collapse features are common in this area.
This image from NASA's 2001 Mars Odyssey spacecraf shows part of the southern flank of Ascraeus Mons. Large collapse features are common in this area.

Ascraeus Mons Collapse Pits

This image from NASA's 2001 Mars Odyssey spacecraft shows part of the large sand sheet and surface dune forms on the floor of Proctor Crater.
This image from NASA's 2001 Mars Odyssey spacecraft shows part of the large sand sheet and surface dune forms on the floor of Proctor Crater.

Proctor Crater Dunes

A rippled dune front in Herschel Crater on Mars moved an average of about one meter (about one yard) between March 3, 2007 and December 1, 2010, as seen in one of two images from NASA's Mars Reconnaissance Orbiter.
A rippled dune front in Herschel Crater on Mars moved an average of about one meter (about one yard) between March 3, 2007 and December 1, 2010, as seen in one of two images from NASA's Mars Reconnaissance Orbiter.

Rippling Dune Front in Herschel Crater on Mars

NASA's Mars Odyssey spacecraft shows that gullies have formed on the side of this ridge in northwestern Argyre Planitia.
NASA's Mars Odyssey spacecraft shows that gullies have formed on the side of this ridge in northwestern Argyre Planitia.

Gullies in Argyre Planitia

This NASA 2001 Mars Odyssey spacecraft image shows the western edge of the summit caldera of Ceranus Tholus, one of the smaller volcanic constructs of the Tharsis region. Several channels dissect the western flank of the volcano.
This NASA 2001 Mars Odyssey spacecraft image shows the western edge of the summit caldera of Ceranus Tholus, one of the smaller volcanic constructs of the Tharsis region. Several channels dissect the western flank of the volcano.

Ceranus Tholus

This image, taken by NASA's 2001 Mars Odyssey spacecraft, shows a small section of Nirgal Vallis.
This image, taken by NASA's 2001 Mars Odyssey spacecraft, shows a small section of Nirgal Vallis.

Nirgal Vallis

This image captured by NASA's 2001 Mars Odyssey spacecraft shows part of Rzvius Valles, located on the northern flank of Alba Mons.
This image captured by NASA's 2001 Mars Odyssey spacecraft shows part of Rzvius Valles, located on the northern flank of Alba Mons.

Ravius Valles

A pedestal crater is when the ejecta from an impact settles around the new crater and is more erosion-resistant than the surrounding terrain as seen in this image from NASA's Mars Reconnaissance Orbiter.
A pedestal crater is when the ejecta from an impact settles around the new crater and is more erosion-resistant than the surrounding terrain as seen in this image from NASA's Mars Reconnaissance Orbiter.

Pedestal Crater Development

This 2015 diagram shows components of the investigations payload for NASA's Mars 2020 rover mission.
This 2015 diagram shows components of the investigations payload for NASA's Mars 2020 rover mission.

Science Instruments on NASA's Mars 2020 Rover

This image from NASA's 2001 Mars Odyssey spacecraft shows dust devil tracks on the surface of Sisyphi Planum.
This image from NASA's 2001 Mars Odyssey spacecraft shows dust devil tracks on the surface of Sisyphi Planum.

Dust Devil Tracks

The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. This false color image from NASA's 2001 Mars Odyssey spacecraft shows part of Nili Patera.
The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. This false color image from NASA's 2001 Mars Odyssey spacecraft shows part of Nili Patera.

Nili Patera - False Color

The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. This false color image from NASA's 2001 Mars Odyssey spacecraft shows part of of Eos Chasma.
The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. This false color image from NASA's 2001 Mars Odyssey spacecraft shows part of of Eos Chasma.

Eos Chasma - False Color

This frame from an animation simulates a flyover of a portion of a Martian canyon detailed in a geological map produced by the U.S. Geological Survey and based on observations by the HiRISE camera on NASA's Mars Reconnaissance Orbiter.
This frame from an animation simulates a flyover of a portion of a Martian canyon detailed in a geological map produced by the U.S. Geological Survey and based on observations by the HiRISE camera on NASA's Mars Reconnaissance Orbiter.

Simulated Flyover of Mars Canyon Map (Animation)

NASA's Mars Reconnaissance Orbiter acquired this image to aid in the search for the missing lander, Mars 2. If the debris field is found, it could serve as a future landing location to study the effects of crash landing on the Martian surface.
NASA's Mars Reconnaissance Orbiter acquired this image to aid in the search for the missing lander, Mars 2. If the debris field is found, it could serve as a future landing location to study the effects of crash landing on the Martian surface.

Search for the Mars 2 Debris Field

At Mars' North Pole is a dome of icy layers ranging up to 2 kilometers thick, roughly analogous to the Earth's ice caps in Greenland or Antarctica. This image is from NASA's Mars Reconnaissance Orbiter.
At Mars' North Pole is a dome of icy layers ranging up to 2 kilometers thick, roughly analogous to the Earth's ice caps in Greenland or Antarctica. This image is from NASA's Mars Reconnaissance Orbiter.

The Icy Surface of the North Polar Cap

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