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This wide-angle view shows the High Bay 1 cleanroom inside the Spacecraft Assembly Facility at NASA's Jet Propulsion Laboratory, Pasadena, Calif.
Working on Curiosity in JPL Spacecraft Assembly Facility
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An artist's concept portrays the proposed Geophysical Monitoring Station mission for studying the deep interior of Mars.
Proposed Mission for Studying Deep Interior of Mars
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Crater in Thaumasia Fossae
Crater in Thaumasia Fossae
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These images from orbit show an area near Mars' south pole where coalescing or elongated pits are interpreted as signs that an underlying deposit of frozen carbon dioxide, or "dry ice," has been shrinking by sublimation.
Pitting from Sublimation of Underlying Dry-Ice Layer
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A newly found, buried deposit of frozen carbon dioxide -- dry ice -- near the south pole of Mars contains about 30 times more carbon dioxide than previously estimated to be frozen near the pole.
Thickness Map of Buried Carbon-Dioxide Deposit
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This cross-section view of underground layers near Mars' south pole is a radargram based on data from the Shallow Subsurface Radar (SHARAD) instrument on NASA's Mars Reconnaissance Orbiter
Cross Section of Buried Carbon-Dioxide Ice on Mars
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On Mars the seasonal polar caps are composed of dry ice (carbon dioxide). In the springtime as the sun shines on the ice, it turns from solid to gas and causes erosion of the surface
Dry Ice Gone Wild
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Top of Mars Rover Curiosity's Remote Sensing Mast
Top of Mars Rover Curiosity's Remote Sensing Mast
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NASA Mars Rover Curiosity at JPL, View from Front Left Corner
NASA Mars Rover Curiosity at JPL, View from Front Left Corner
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Arm and Mast of NASA Mars Rover Curiosity
Arm and Mast of NASA Mars Rover Curiosity
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NASA Mars Rover Curiosity at JPL, Side View
NASA Mars Rover Curiosity at JPL, Side View
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The Mast Camera (Mastcam) on NASA's Mars rover Curiosity has two rectangular "eyes" near the top of the rover's remote sensing mast. The mast is on the right side of the rover, which puts it on the left side of this image taken from in front of the rover.
Curiosity on Tilt Table with Mast Up
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This image shows preparation for one phase of testing of the Mars Science Laboratory rover, Curiosity.
Bright Days Ahead for Curiosity Mars Rover
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This image shows preparation for March 2011 testing of the Mars Science Laboratory rover, Curiosity, in a 25-foot-diameter (7.6-meter-diameter) space-simulation chamber. The testing was designed to put the rover through operational sequences in environmental conditions similar to what it will experience on the surface of Mars.
Preparing for Solar and Thermal Testing of Curiosity Mars Rover
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This view combines hundreds of images taken during the first several weeks after NASA's Phoenix Mars Lander arrived on an arctic plain at 68.22 degrees north latitude, 234.25 degrees east longitude on Mars. The landing was on May 25, 2008.
Mars Panorama of Phoenix Landing Site and Lander Deck
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Images like this from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter show portions of the Martian surface in unprecedented detail. 
True Gullies on Mars
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The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter acquired this color image on March 9, 2011, of &quot;Santa Maria&quot; crater, showing NASA's Mars Exploration Rover Opportunity perched on the southeast rim.
Opportunity Is Still Smiling
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This image shows the context for orbital observations of exposed rocks that had been buried an estimated 5 kilometers (3 miles) deep on Mars.
Nature's Drilling Exposes Deeply Buried Minerals
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This image from orbit covers an area about 460 meters (about 1,500 feet) across, in which carbonate minerals have been identified from spectrometer observations. Fractures and possible layers are visible in the light-toned rock exposure containing the carbonates.
Fractures in Carbonate-Bearing Rocks at Mars' Huygens Basin
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Grad student Nicholas Boyd (left) and Principal Investigator Ralf Gellert, both of the University of Guelph, Ontario, Canada, prepare for the installation of the Alpha Particle X-ray Spectrometer sensor head during testing at NASA's Jet Propulsion Laboratory.
Preparing to Install APXS Sensor Head
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The sensor head on the Alpha Particle X-ray Spectrometer instrument was installed during testing at NASA's Jet Propulsion Laboratory. The instrument is part of the Curiosity rover, which will fly on NASA's Mars Science Laboratory mission. For perspective, the sensor head is 7.8 centimeters, or about 3 inches tall.
Sensor head on the Mars-bound APXS Instrument
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The Magnetometer (MAG) is a part of the Particles and Fields (P & F) Package and measures interplanetary solar wind and ionospheric magnetic fields.
MAVEN Magnetometer
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The Neutral Gas and Ion Mass Spectrometer (NGIMS) measures the composition and isotopes of thermal neutrals and ions.
Neutral Gas and Ion Mass Spectrometer for MAVEN Spacecraft
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The Imaging Ultraviolet Spectrometer (IUVS) is a part of the Remote Sensing (RS) Package and measures global characteristics of the upper atmosphere and ionosphere.
Imaging Ultraviolet Spectrometer for MAVEN Spacecraft
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This picture of a heart-shaped feature in Arabia Terra on Mars was taken on May 23, 2010, by the Context Camera (CTX) on NASA's Mars Reconnaissance Orbiter.
Heart-shaped Feature in Arabia Terra (Wide View)
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