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This image from NASA's 2001 Mars Odyssey spacecraft shows some of the extensive volcanic flows east of the large Tharsis volcanoes.
This image from NASA's 2001 Mars Odyssey spacecraft shows some of the extensive volcanic flows east of the large Tharsis volcanoes.

Tharsis Volcanics

An unnamed channel drains a high standing region in Tyrrhena Terra in this image captured by NASA's 2001 Mars Odyssey spacecraft.
An unnamed channel drains a high standing region in Tyrrhena Terra in this image captured by NASA's 2001 Mars Odyssey spacecraft.

Channel in Tyrrhena Terra

This image from NASA's Mars Odyssey shows a small portion of two landslide deposits within Melas Chasma.
This image from NASA's Mars Odyssey shows a small portion of two landslide deposits within Melas Chasma.

Melas Chasma Landslides

Wind is one of a handful of active processes on Mars today. This image taken by NASA's 2001 Mars Odyssey of Memnonia Sulci demonstrates the power of wind in eroding and shaping the surface.
Wind is one of a handful of active processes on Mars today. This image taken by NASA's 2001 Mars Odyssey of Memnonia Sulci demonstrates the power of wind in eroding and shaping the surface.

Memnonia Sulci

This image shows lava flows that originated at Olympus Mons as seen by NASA's 2001 Mars Odyssey spacecraft.
This image shows lava flows that originated at Olympus Mons as seen by NASA's 2001 Mars Odyssey spacecraft.

Olympus Mons Lava

The volcanic flows in this image from NASA's Mars Odyssey spacecraft are at the far southwestern margin of Daedalia Planum. Notice the different appearance of this dunes compared to yesterday's image.
The volcanic flows in this image from NASA's Mars Odyssey spacecraft are at the far southwestern margin of Daedalia Planum. Notice the different appearance of this dunes compared to yesterday's image.

Volcanic Flows

Now that summer has arrived in the northern hemisphere of Mars, the dunes near the polar cap have shed all their winter frost, as shown in this image from NASA's 2001 Mars Odyssey spacecraft.
Now that summer has arrived in the northern hemisphere of Mars, the dunes near the polar cap have shed all their winter frost, as shown in this image from NASA's 2001 Mars Odyssey spacecraft.

North Polar Dunes

This image captured by NASA's 2001 Mars Odyssey spacecraft shows the same crater as yesterday's IR image.
This image captured by NASA's 2001 Mars Odyssey spacecraft shows the same crater as yesterday's IR image.

'Butterfly' Crater

NASA's Mars Odyssey shows Rhabon Valles, a lava channel located between Ascraeus Mons and Uranius Mons.
NASA's Mars Odyssey shows Rhabon Valles, a lava channel located between Ascraeus Mons and Uranius Mons.

Rhabon Vallis

Spring has arrived at the south pole of Mars. The multitude of layers that make up the cap are readily visible in this image from NASA's 2001 Mars Odyssey spacecraft.
Spring has arrived at the south pole of Mars. The multitude of layers that make up the cap are readily visible in this image from NASA's 2001 Mars Odyssey spacecraft.

South Polar Cap

Shalbatana Vallis dominates this image captured by NASA's 2001 Mars Odyssey spacecraft.
Shalbatana Vallis dominates this image captured by NASA's 2001 Mars Odyssey spacecraft.

Shalbatana Vallis

This image from NASA's 2001 Mars Odyssey spacecraft shows a field of sand dunes located on the floor of this unnamed crater in Terra Cimmeria. Several gullies dissect the northern rim of the crater.
This image from NASA's 2001 Mars Odyssey spacecraft shows a field of sand dunes located on the floor of this unnamed crater in Terra Cimmeria. Several gullies dissect the northern rim of the crater.

Crater Dunes

The region shown in this image captured by NASA's 2001 Mars Odyssey spacecraft is part of Gigas Sulci.
The region shown in this image captured by NASA's 2001 Mars Odyssey spacecraft is part of Gigas Sulci.

Gigas Sulci

In the lee of this unnamed crater there are no dunes, but numerous dust devil tracks. Dunes surround the crater, except for the lee area, as shown in image from NASA's Mars Odyssey spacecraft.
In the lee of this unnamed crater there are no dunes, but numerous dust devil tracks. Dunes surround the crater, except for the lee area, as shown in image from NASA's Mars Odyssey spacecraft.

More Siton Undae

Dark slope streaks mark the rim of this unnamed crater withing Tikhonravov Crater in Terra Sabaea as seen by NASA's 2001 Mars Odyssey spacecraft.
Dark slope streaks mark the rim of this unnamed crater withing Tikhonravov Crater in Terra Sabaea as seen by NASA's 2001 Mars Odyssey spacecraft.

Dark Slope Streaks

This image from NASA's 2001 Mars Odyssey spacecraft shows the dunes located on the floor of Brashear Crater.
This image from NASA's 2001 Mars Odyssey spacecraft shows the dunes located on the floor of Brashear Crater.

Brashear Crater Dunes

This two-image blink shows a comparison of two exposure times in images from the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity showing comet C/2013 A1 Siding Spring as it flew near Mars on Oct. 19, 2014.
This two-image blink shows a comparison of two exposure times in images from the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity showing comet C/2013 A1 Siding Spring as it flew near Mars on Oct. 19, 2014.

Mars Rover Opportunity's View of Comet (Blink of Two Exposures)

This image captured by NASA's 2001 Mars Odyssey spacecraft shows a portion of Lycus Sulci, a complex region of ridges located on the northern side of Olympus Mons. The term sulci means subparallel furrows and ridges.
This image captured by NASA's 2001 Mars Odyssey spacecraft shows a portion of Lycus Sulci, a complex region of ridges located on the northern side of Olympus Mons. The term sulci means subparallel furrows and ridges.

Lycus Sulci

This image captured by NASA's 2001 Mars Odyssey spacecraft shows several small landslide deposits in Noctis Labyrinthus.
This image captured by NASA's 2001 Mars Odyssey spacecraft shows several small landslide deposits in Noctis Labyrinthus.

Landslide Deposits

Mesas and valleys form the terrain called Margaritifer Chaos as shown in this image captured by NASA's 2001 Mars Odyssey spacecraft.
Mesas and valleys form the terrain called Margaritifer Chaos as shown in this image captured by NASA's 2001 Mars Odyssey spacecraft.

Margaritifer Chaos

NASA's Mars Exploration Rover Opportunity spent the seventh anniversary of its landing on Mars investigating a crater called 'Santa Maria,' which has a diameter about the length of a football field. 3D glasses are necessary to view this image.
NASA's Mars Exploration Rover Opportunity spent the seventh anniversary of its landing on Mars investigating a crater called 'Santa Maria,' which has a diameter about the length of a football field. 3D glasses are necessary to view this image.

Stereo Panorama of 'Santa Maria' Crater for Opportunity's Anniversary

This image from NASA's 2001 Mars Odyssey spacecraft of Daedalia Planum shows the termination or end of a single flow. In this case it is the end of the brighter/rougher flow on the right side of the image.
This image from NASA's 2001 Mars Odyssey spacecraft of Daedalia Planum shows the termination or end of a single flow. In this case it is the end of the brighter/rougher flow on the right side of the image.

Arcuate Fratures

This image from NASA's 2001 Mars Odyssey spacecraft shows evidence of tectonic stresses that deform and fracture rocks and planetary surfaces. Right angles seen here are a good indication that the feature was formed by tectonic stresses.
This image from NASA's 2001 Mars Odyssey spacecraft shows evidence of tectonic stresses that deform and fracture rocks and planetary surfaces. Right angles seen here are a good indication that the feature was formed by tectonic stresses.

Tectonism

This unusual surface texture is found on the northwest part of Olympus Mons as seen by NASA's Mars Odyssey. The origin of this texture is unknown, but speculations include glacial or volatile rich materials as part of the cause of such textures.
This unusual surface texture is found on the northwest part of Olympus Mons as seen by NASA's Mars Odyssey. The origin of this texture is unknown, but speculations include glacial or volatile rich materials as part of the cause of such textures.

Inner Lycus Sulci

This frame from an animation shows Phobos, the larger of the two moons of Mars, passing overhead, as observed by NASA's Mars rover Curiosity, centered straight overhead starting shortly after sunset.
This frame from an animation shows Phobos, the larger of the two moons of Mars, passing overhead, as observed by NASA's Mars rover Curiosity, centered straight overhead starting shortly after sunset.

Phobos Passing Overhead

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