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Comet Siding Spring will have a close approach to Mars on Oct. 19, 2014. This artist's concept shows people in the Southern Hemisphere where to look for Mars in the night sky. Mars and the comet may be visible with binoculars.
Comet Siding Spring will have a close approach to Mars on Oct. 19, 2014. This artist's concept shows people in the Southern Hemisphere where to look for Mars in the night sky. Mars and the comet may be visible with binoculars.

View of Comet Siding Spring from Southern Hemisphere (Artist's Concept)

The dunes in this image from NASA's 2001 Mars Odyssey spacecraft are still partial covered in frost. They will get darker and darker as the frost is removed and the underlying dark material is completely exposed.
The dunes in this image from NASA's 2001 Mars Odyssey spacecraft are still partial covered in frost. They will get darker and darker as the frost is removed and the underlying dark material is completely exposed.

Frosted Dunes

Layering in south polar ice is easy to see in this outlier of the main polar cap. This image was captured by NASA's Mars Odyssey.
Layering in south polar ice is easy to see in this outlier of the main polar cap. This image was captured by NASA's Mars Odyssey.

South Polar Layers

This nearly global mosaic of observations from NASA's Mars Reconnaissance Orbiter on Nov. 18, 2012, shows a dust storm in Mars' southern hemisphere. Small white arrows outline the area where dust from the storm is apparent in the atmosphere.
This nearly global mosaic of observations from NASA's Mars Reconnaissance Orbiter on Nov. 18, 2012, shows a dust storm in Mars' southern hemisphere. Small white arrows outline the area where dust from the storm is apparent in the atmosphere.

Martian Dust Storm, Nov. 18, 2012

This channel is located in the volcanic flows north of Olympus Mons as seen by NASA's Mars Odyssey.
This channel is located in the volcanic flows north of Olympus Mons as seen by NASA's Mars Odyssey.

Channels

This image from NASA's 2001 Mars Odyssey shows the sand sheet with dune forms located on the floor of Rabe Crater.
This image from NASA's 2001 Mars Odyssey shows the sand sheet with dune forms located on the floor of Rabe Crater.

Rabe Crater Dunes

This image captured by NASA's Mars Odyssey shows layering in the south polar cap.
This image captured by NASA's Mars Odyssey shows layering in the south polar cap.

South Polar Layers

This image from NASA's Mars Odyssey show regions of densely coalesced dunes, common around the North Polar cap of Mars.
This image from NASA's Mars Odyssey show regions of densely coalesced dunes, common around the North Polar cap of Mars.

North Polar Dunes

This view of 'Intrepid' crater, about 20 meters (66 feet) in diameter, is a mosaic of images taken by the navigation camera on NASA's Mars Exploration Rover Opportunity. The view spans 180 degrees and is centered toward the east.
This view of 'Intrepid' crater, about 20 meters (66 feet) in diameter, is a mosaic of images taken by the navigation camera on NASA's Mars Exploration Rover Opportunity. The view spans 180 degrees and is centered toward the east.

'Intrepid' Crater on Opportunity's Martian Trek

The small channels in this image of Utopia Planitia are south of Granicus Valles were captured by NASA's Mars Odyssey on July 23, 2010.
The small channels in this image of Utopia Planitia are south of Granicus Valles were captured by NASA's Mars Odyssey on July 23, 2010.

Utopia Planitia

This image of windstreaks from NASA's 2001 Mars Odyssey spacecraft indicates winds from the ENE in the region of Syrtis Major Planum.
This image of windstreaks from NASA's 2001 Mars Odyssey spacecraft indicates winds from the ENE in the region of Syrtis Major Planum.

Windstreaks in Syrtis Major Planum

This image from NASA's Mars Odyssey shows lava flows of Alba Mons and windstreaks behind craters in the area. Windstreak tail directions indicate winds from the East and East-Northeast.
This image from NASA's Mars Odyssey shows lava flows of Alba Mons and windstreaks behind craters in the area. Windstreak tail directions indicate winds from the East and East-Northeast.

Wind and Rock

This image from NASA's Mars Odyssey shows part of the summit caldera of Ceraunius Tholus, one of the smaller volcanoes of the Tharsis region.
This image from NASA's Mars Odyssey shows part of the summit caldera of Ceraunius Tholus, one of the smaller volcanoes of the Tharsis region.

Ceraunius Tholus

This image of Candor Chasma taken by NASA's 2001 Mars Odyssey contains eroded deposits of material and a large landslide deposit. Gravity, wind, and water all played a role in shaping the landforms we see in this image.
This image of Candor Chasma taken by NASA's 2001 Mars Odyssey contains eroded deposits of material and a large landslide deposit. Gravity, wind, and water all played a role in shaping the landforms we see in this image.

Candor Chasma

This image from NASA's Mars Reconnaissance Orbiter shows a swath of a debris apron east of Hellas Basin. Features like this are often found surrounding isolated mountains in this area. Original release date March 3, 2010.
This image from NASA's Mars Reconnaissance Orbiter shows a swath of a debris apron east of Hellas Basin. Features like this are often found surrounding isolated mountains in this area. Original release date March 3, 2010.

Craters on an Ice-Rich D├ębris Apron

Ius Chasma is one of several canyons that make up Valles Marineris, the largest canyon system in the Solar System as seen by NASA's Mars Reconnaissance Orbiter.
Ius Chasma is one of several canyons that make up Valles Marineris, the largest canyon system in the Solar System as seen by NASA's Mars Reconnaissance Orbiter.

Floor of Ius Chasma

This image from NASA's Curiosity shows a scoop full of sand and dust lifted by the rover's first use of the scoop on its robotic arm. In the foreground, near bottom of this image, the bright object visible on the ground might be a piece of rover hardware.
This image from NASA's Curiosity shows a scoop full of sand and dust lifted by the rover's first use of the scoop on its robotic arm. In the foreground, near bottom of this image, the bright object visible on the ground might be a piece of rover hardware.

View of Curiosity's First Scoop Also Shows Bright Object

This image of Ganges Chasma, captured by NASA's 2001 Mars Odyssey spacecraft, contains both landslide deposits and dunes.
This image of Ganges Chasma, captured by NASA's 2001 Mars Odyssey spacecraft, contains both landslide deposits and dunes.

Ganges Chasma

This mosaic is a view from NASA's Mars Exploration Rover Opportunity of
This mosaic is a view from NASA's Mars Exploration Rover Opportunity of

'Yankee Clipper' Crater on Mars

This image captured by NASA's 2001 Mars Odyssey spacecraft shows a section of Bahram Vallis.
This image captured by NASA's 2001 Mars Odyssey spacecraft shows a section of Bahram Vallis.

Bahram Vallis

This image from NASA's Mars Reconnaissance Orbiter shows part of an unnamed crater, itself located inside the much larger Newton Crater, in Terra Sirenum. Original release date March 3, 2010.
This image from NASA's Mars Reconnaissance Orbiter shows part of an unnamed crater, itself located inside the much larger Newton Crater, in Terra Sirenum. Original release date March 3, 2010.

Gullies and... Gullies? in Terra Sirenum

This unusual channel is located in northern Arabia Terra. This image from NASA's Mars Odyssey was captured on 2010-10-21 00:17.
This unusual channel is located in northern Arabia Terra. This image from NASA's Mars Odyssey was captured on 2010-10-21 00:17.

Unusual Channel

The fractures in this image from NASA's 2001 Mars Odyssey are located on the northwestern flank of the Elysium Mons volcanic complex.
The fractures in this image from NASA's 2001 Mars Odyssey are located on the northwestern flank of the Elysium Mons volcanic complex.

Elysium Fractures

This stereo panoramic view combines 14 images taken by NASA's Mars rover Curiosity during the mission's 120th Martian day, or sol (Dec. 7, 2012). You need 3D glasses.
This stereo panoramic view combines 14 images taken by NASA's Mars rover Curiosity during the mission's 120th Martian day, or sol (Dec. 7, 2012). You need 3D glasses.

Sol 120 Panorama from Curiosity, near 'Shaler' (Stereo)

Researchers have found deposits of impact glass preserved in Martian craters, including Alga Crater, shown here. The detection is based on data from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) on NASA's Mars Reconnaissance Orbiter.
Researchers have found deposits of impact glass preserved in Martian craters, including Alga Crater, shown here. The detection is based on data from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) on NASA's Mars Reconnaissance Orbiter.

Spectral Signals Indicating Impact Glass on Mars

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