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A sea of dark dunes, sculpted by the wind into long lines, surrounds the northern polar cap covering an area as big as Texas.
Mars Odyssey All Stars: Polar Dunes
A vast dune field lies near the northern polar cap of Mars. Seen here in summer, the dunes have partially buried an impact crater about 1,000 meters (3,300 feet) wide.
Mars Odyssey All Stars: Dunes Engulf Crater
If a meteorite breaks in two shortly before hitting the ground, the typical bowl shape of a single impact crater becomes doubled.
Mars Odyssey All Stars: Dual Crater
Chasma Boreale is a long, flat-floored valley that cuts deep into Mars' north polar icecap
Mars Odyssey All Stars: Chasma Boreale
Sand dunes shaped like blue-black flames lie next to a central hill within an unnamed, 120-kilometer-wide (75-mile-wide) crater in eastern Arabia on Mars.
Mars Odyssey All Stars: Arabia Dunes
Although it is 45 kilometers (28 miles) wide, countless layers of ice and dust have all but buried Udzha Crater.
Mars Odyssey All Stars: Udzha Crater
West of Valles Marineris lies a checkerboard named Noctis Labyrinthus, which formed when the Martian crust stretched and fractured.
Mars Odyssey All Stars: Noctis Vista
A false-color mosaic focuses on one junction in Noctis Labyrinthus where canyons meet to form a depression 4,000 meters (13,000 feet) deep.
Mars Odyssey All Stars: Noctis Canyon
Fans and ribbons of dark sand dunes creep across the floor of Bunge Crater in response to winds blowing from the direction at the top of the picture.
Mars Odyssey All Stars: Bunge Crater Dunes
In Ares Vallis, teardrop mesas extend like pennants behind impact craters, where the raised rocky rims diverted the floods and protected the ground from erosion.
Mars Odyssey All Stars: Ares Vallis
Wind shadow and real shadow combine to give a striking image of a comet.
THEMIS Images as Art
This proposed future Mars landing site in Acidalia Planitia targets densely occurring mounds thought to be mud volcanoes.
Proposed Future Mars Landing Site: Acidalia Planitia Mud Volcanoes
This image shows a graben (a trough formed when the ground drops between two parallel faults) and a lava flow in the Tharsis volcanic province of Mars. North is up.
Graben Cutting Lava Flow in Tharsis
Two dark, rimless pits are located to the northwest of Ascraeus Mons in the Tharsis volcanic region of Mars.
Dark Rimless Pits in the Tharsis Region
This enhanced image shows the inside of a rimless pit about 310 meters (1,017 feet) in diameter, northwest of the mountain Ascraeus Mons in the northern hemisphere of Mars.
Boulders Inside a Rimless Martian Pit (Stretched)
This enhanced image shows the inside of a rimless pit about 180 meters (591 feet) in diameter, northwest of the mountain Ascraeus Mons in the northern hemisphere of Mars.
Sand Ripples Inside a Rimless Martian Pit (Stretched)
Sensors on two finger-like mini-booms extending horizontally from the mast of NASA's Mars rover Curiosity will monitor wind speed, wind direction and air temperature.
Weather Sensors from Spain on Mars Rover Curiosity
This stereo view of terrestrial rocks combines two images taken by a testing twin of the Mars Hand Lens Imager (MAHLI) camera on NASA's Mars Science Laboratory.
Test Image of Earth Rocks by Mars Camera (Stereo)
This close-up view of a stone found in San Diego was taken by a testing twin -- the "life test unit" -- of the Mars Hand Lens Imager (MAHLI) camera for NASA's Mars Science Laboratory.
Test Close-Up of Earth Cobble by Mars Camera
This view of terrestrial rocks was taken by a testing twin -- the "life test unit" -- of the Mars Hand Lens Imager (MAHLI) camera on NASA's Mars Science Laboratory.
Test Image of Earth Rocks by Mars Camera
This view of grains from a sand dune near Christmas Lake, Ore., was taken by a testing twin of the Mars Hand Lens Imager (MAHLI) camera on NASA's Mars Science Laboratory.
Test Image of Earth Sand by Mars Camera
The Mars Hand Lens Imager (MAHLI) camera will fly on NASA's Mars Science Laboratory mission, launching in late 2011.
Color Camera for Curiosity's Robotic Arm
This instrument, shown prior to its September 2010 installation onto NASA's Mars rover Curiosity, will aid future human missions to Mars by providing information about the radiation environment on Mars and on the way to Mars.
Radiation Assessment Detector for Mars Science Laboratory
This volcanic cone in the Nili Patera caldera on Mars has hydrothermal mineral deposits on the southern flanks and nearby terrains.
Mars Volcanic Cone with Hydrothermal Deposits
The gullies on a Martian sand dune in this trio of images from NASA's Mars Reconnaissance Orbiter deceptively resemble features on Earth that are carved by streams of water.
Gully Changes on Martian Sand Dune
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