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This image superimposes Gamma-Ray Spectrometer data from NASA's Mars Odyssey orbiter onto topographic data from the laser altimeter on NASA's Mars Global Surveyor.
Potassium Concentrations on Mars
Full Resolution
This image shows layers of rock stacked like a staircase, their edges extending diagonally from top left to bottom right and stepping downward from the lower left to the top right. At the far left of the image is an eroded, round crater filled with a row of nearly parallel sand dunes. To the right of the crater, a pinkish-colored layer of light-toned rock within the staircase contains opal.
A Gem of a Find
Full Resolution
This image shows an example of layers in the Martian north polar deposits. These deposits, part of the Planum Boreum dome, are composed mainly of water ice and small amounts of dust.

The layers within these deposits are exposed by shallowly-sloping troughs that cut into them. This image is particularly interesting because it crosses complicated trough geometry, making the layers appear curved and exposing multiple stratigraphic levels.

Note that layers of different thicknesses are visible. Layer thickness is directly related to the accumulation rate of the layer; a higher accumulation rate will lead to a thicker layer. However, a myriad of factors work together to influence accumulation rate, such as the amount of sunlight reaching the surface and the amount of water in the contemporaneous atmosphere.
Stratigraphy of the North Polar Deposits
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Growing Library of Mars Spectrometer Images
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Image of Hesperia Planum from the HiRISE camera on Mars Reconnaissance Orbiter.
Hesperia Planum
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Deformation Bands in Martian Bedrock
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Clay Minerals in Mawrth Vallis Region of Mars
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Crater Floor Deposits in Promethei Terra
Crater Floor Deposits in Promethei Terra
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This map shows the thickness of the north polar layered deposits on Mars as measured by the Shallow Radar instrument on NASA's Mars Reconnaissance Orbiter.
How Thick is the North Polar Ice Cap on Mars?
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Eridania Basin Light-Toned Outcrops
Eridania Basin Light-Toned Outcrops
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Phoenix Landing Area Viewed by Mars Color Imager
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Sample Noachis Terra
Sample Noachis Terra
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Phobos in Stereo
'Marsshine' on Shadowed Part of Phobos
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'Marsshine' on Shadowed Part of Phobos
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'Marsshine' on Shadowed Part of Phobos
Phobos from 5,800 Kilometers
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NASA Spacecraft Images Mars Moon in Color and in 3D
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Phobos from 6,800 Kilometers (Color)
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NASA Spacecraft Images Mars Moon in Color and in 3D
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Phobos from 5,800 Kilometers
Phobos from 6,800 Kilometers
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Phobos from 6,800 Kilometers
Phobos from 5,800 Kilometers (Color)
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Caught in Action: This image shows avalanches on North Polar Scarps.
Caught in Action: Avalanches on North Polar Scarps
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Chloride Salt Deposit in Southern Highlands of Mars
Bright Exposures of Chloride Salt on Southern Mars
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Bright Exposures of Chloride Salt on Southern Mars
Bright Exposures of Chloride Salt on Southern Mars
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NASA's Mars Exploration Rover Spirit has this view northward from the position at the north edge of the "Home Plate" plateau where the rover will spend its third Martian winter.
View from Spirit's Overwintering Position (False Color)
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During four months prior to the fourth anniversary of its landing on Mars, Opportunity examined rocks inside an alcove called "Duck Bay" in the western portion of Victoria Crater.
'Lyell' Panorama inside Victoria Crater
Full Resolution
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