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The bizarre patterns on the floor of this crater in Nilosyrtis Mensae imaged by NASA's Mars Odyssey defy an easy explanation. It is possible that some form of periglacial process combined with the vaporization of ground ice to form these patterns.
The bizarre patterns on the floor of this crater in Nilosyrtis Mensae imaged by NASA's Mars Odyssey defy an easy explanation. It is possible that some form of periglacial process combined with the vaporization of ground ice to form these patterns.

Concentric Crater Fill

This image from NASA's Mars Odyssey spacecraft shows crater wall dust avalanches in southern Arabia Terra.
This image from NASA's Mars Odyssey spacecraft shows crater wall dust avalanches in southern Arabia Terra.

Dust Avalanches

The impact crater in this NASA Mars Odyssey image is a model illustration of the effects of erosion on Mars. The degraded crater rim and several landslides observed in crater walls are evidence of the mass wasting of materials.
The impact crater in this NASA Mars Odyssey image is a model illustration of the effects of erosion on Mars. The degraded crater rim and several landslides observed in crater walls are evidence of the mass wasting of materials.

Erosion Effects

The layered deposits in this Valles Marineris canyon imaged by NASA's Mars Odyssey spacecraft are heavily eroded by the wind into an impressive array of yardangs and swirling patterns of layers. The origin of the deposits remains a mystery.
The layered deposits in this Valles Marineris canyon imaged by NASA's Mars Odyssey spacecraft are heavily eroded by the wind into an impressive array of yardangs and swirling patterns of layers. The origin of the deposits remains a mystery.

Layered Deposits in Western Candor Chasma

In this image from NASA's Mars Odyssey spacecraft, striations on the floor of this sinuous channel adjacent to Protonilus Mensae look like they result from the flow of lava or perhaps even glacial ice.
In this image from NASA's Mars Odyssey spacecraft, striations on the floor of this sinuous channel adjacent to Protonilus Mensae look like they result from the flow of lava or perhaps even glacial ice.

Evidence of flow?

At first glance, this NASA Mars Odyssey image showing impact craters and linear ridges and troughs is typical of the southern highlands. However, upon closer examination migrating sand dunes are observed within the troughs.
At first glance, this NASA Mars Odyssey image showing impact craters and linear ridges and troughs is typical of the southern highlands. However, upon closer examination migrating sand dunes are observed within the troughs.

Southern Sand Dunes

In this image from NASA's Mars Odyssey, a mantling layer of sediment slumps off the edge of a mesa in Candor Chasma producing a ragged pattern of erosion that hints at the presence of a volatile component mixed in with the sediment.
In this image from NASA's Mars Odyssey, a mantling layer of sediment slumps off the edge of a mesa in Candor Chasma producing a ragged pattern of erosion that hints at the presence of a volatile component mixed in with the sediment.

Candor Chasma Mesa

This area of Mars imaged by NASA's Mars Odyssey shows a wonderful example of relative geologic dating. Ancient lava flows and escarpments are mantled by younger impact ejecta, which was cut by a younger graben and resurfaced by smaller impact craters.
This area of Mars imaged by NASA's Mars Odyssey shows a wonderful example of relative geologic dating. Ancient lava flows and escarpments are mantled by younger impact ejecta, which was cut by a younger graben and resurfaced by smaller impact craters.

Resurfaced Mars

Impact craters in Hecates Tholus, as seen in this image from NASA's Mars Odyssey spacecraft, appear to be filled with sediment derived from erosion of the surrounding terrain.
Impact craters in Hecates Tholus, as seen in this image from NASA's Mars Odyssey spacecraft, appear to be filled with sediment derived from erosion of the surrounding terrain.

Hecates Tholus

These pit-chain features in this NASA Mars Odyssey image of south Noctis Labryinthus are oriented parallel to grabens in the area, suggesting that tensional stresses may have been responsible for their formation.
These pit-chain features in this NASA Mars Odyssey image of south Noctis Labryinthus are oriented parallel to grabens in the area, suggesting that tensional stresses may have been responsible for their formation.

Pit-chain in Noctis Labyrinthus

Dark streaks emanating from within impact crater walls show evidence for mass movement of materials in this image from NASA's Mars Odyssey spacecraft.
Dark streaks emanating from within impact crater walls show evidence for mass movement of materials in this image from NASA's Mars Odyssey spacecraft.

Impact crater

Ripple bedforms fill large fractures near the southern rim of Holden Crater in this image from NASA's Mars Odyssey spacecraft.
Ripple bedforms fill large fractures near the southern rim of Holden Crater in this image from NASA's Mars Odyssey spacecraft.

Holden Crater

A large streamlined island in Kasei Vallis, as seen in this NASA Mars Odyssey image, shows evidence of scour on its surface, probably from floods that preceded the formation of the island.
A large streamlined island in Kasei Vallis, as seen in this NASA Mars Odyssey image, shows evidence of scour on its surface, probably from floods that preceded the formation of the island.

Kasei Vallisland

The style of erosion along the highlands-lowlands boundary of southern Elysium Planitia has produced a strange pattern of troughs that look like the skin of a reptile, as seen in this image from NASA's Mars Odyssey spacecraft.
The style of erosion along the highlands-lowlands boundary of southern Elysium Planitia has produced a strange pattern of troughs that look like the skin of a reptile, as seen in this image from NASA's Mars Odyssey spacecraft.

Scaly-skinned Mars

This image from NASA's Mars Odyssey shows part of the summit caldera of Pavonis Mons, the middle of three Tharsis volcanos that form a line southeast of Olympus Mons and northwest of Vallis Marineris.
This image from NASA's Mars Odyssey shows part of the summit caldera of Pavonis Mons, the middle of three Tharsis volcanos that form a line southeast of Olympus Mons and northwest of Vallis Marineris.

Pavonis Mons Summit Caldera

Coprates Chasma comprises the central portion of the Valles Marineris canyon system complex. This image from NASA's Mars Odyssey spacecraft of the southern wall of Coprates Chasma contains a landslide deposit with dunes over portions of slide.
Coprates Chasma comprises the central portion of the Valles Marineris canyon system complex. This image from NASA's Mars Odyssey spacecraft of the southern wall of Coprates Chasma contains a landslide deposit with dunes over portions of slide.

Coprates Chasma Landslide

Reull Vallis, located in Mars' cratered southern hemisphere, flows for over 1,000 km (about 620 miles) toward the Hellas basin. This NASA Mars Odyssey image shows a portion of the channel with its enigmatic lineated floor deposits.
Reull Vallis, located in Mars' cratered southern hemisphere, flows for over 1,000 km (about 620 miles) toward the Hellas basin. This NASA Mars Odyssey image shows a portion of the channel with its enigmatic lineated floor deposits.

Reull Vallis

This NASA Mars Odyssey image captures a portion of several lava flows in Daedalia Planum southwest of the Arsia Mons shield volcano. Textures characteristic of the variable surface roughness associated with different lava flows in this region are easily s
This NASA Mars Odyssey image captures a portion of several lava flows in Daedalia Planum southwest of the Arsia Mons shield volcano. Textures characteristic of the variable surface roughness associated with different lava flows in this region are easily s

Lava Flows of Daedalia Planum

This image from NASA's Mars Odyssey is located near the equator and the prime meridian of Mars in a region called Terra Meridiani. This is a unique area of Mars that displays layers of material that appear to be in the process of being stripped away.
This image from NASA's Mars Odyssey is located near the equator and the prime meridian of Mars in a region called Terra Meridiani. This is a unique area of Mars that displays layers of material that appear to be in the process of being stripped away.

Terra Meridiani

Like drippings from a candle, these lava flows on the flank of Olympus Mons volcano, seen in this image from NASA's Mars Odyssey spacecraft, demonstrate how it became the largest volcano in the solar system.
Like drippings from a candle, these lava flows on the flank of Olympus Mons volcano, seen in this image from NASA's Mars Odyssey spacecraft, demonstrate how it became the largest volcano in the solar system.

Olympus Mons Flows

This image from NASA's Mars Odyssey shows deposits in a crater located in Arabia Terra. Arabia is generally dust covered and dark streaks or dust avalanches are present in the crater walls.
This image from NASA's Mars Odyssey shows deposits in a crater located in Arabia Terra. Arabia is generally dust covered and dark streaks or dust avalanches are present in the crater walls.

Arabia Terra

This NASA Mars Odyssey image shows parts of the dissected and eroded remnants of an impact crater rim and volcanic material located north of Apollinaris Patera near the southern highlands - northern lowlands dichotomy on Mars.
This NASA Mars Odyssey image shows parts of the dissected and eroded remnants of an impact crater rim and volcanic material located north of Apollinaris Patera near the southern highlands - northern lowlands dichotomy on Mars.

Appollinaris Patera

Located in Arabia Terra, the crater shown in this image from NASA's Mars Odyssey spacecraft is known as Henry Crater. Like many other craters on Mars, the interior of Henry Crater is filled with a layered deposit.
Located in Arabia Terra, the crater shown in this image from NASA's Mars Odyssey spacecraft is known as Henry Crater. Like many other craters on Mars, the interior of Henry Crater is filled with a layered deposit.

Henry Crater

The Cydonia region on Mars, seen in this image from NASA's Mars Odyssey spacecraft, straddles the boundary between the bright, dusty, cratered highlands to the southeast and the dark, relatively dust-free, lowland plains to the west.
The Cydonia region on Mars, seen in this image from NASA's Mars Odyssey spacecraft, straddles the boundary between the bright, dusty, cratered highlands to the southeast and the dark, relatively dust-free, lowland plains to the west.

Cydonia Landscape

This NASA Mars Odyssey image was taken during winter in the southern hemisphere, meaning that the usually cloudy Hellas Basin is relatively free from clouds.
This NASA Mars Odyssey image was taken during winter in the southern hemisphere, meaning that the usually cloudy Hellas Basin is relatively free from clouds.

Winter in Hellas Basin

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