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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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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
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Three images of the same location taken at different times on Mars show seasonal activity causing sand avalanches and ripple changes on a Martian dune.
Seasonal Changes in Northern Mars Dune Field
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This is a side view of an artist's conception of NASA's Mars Atmosphere and Volatile Evolution MissioN (MAVEN) Mars orbiter.
Artist's Concept of MAVEN side view
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This is an artist's conception of NASA's Mars Atmosphere and Volatile Evolution MissioN (MAVEN) Mars orbiter.
Artist's Concept of MAVEN
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The Sample Analysis at Mars (SAM) instrument, largest of the 10 science instruments for NASA's Mars Science Laboratory mission, will examine samples of Martian rocks, soil and atmosphere for information about chemicals that are important to life and other chemical indicators about past and present environments.
Schematic of Sample Analysis at Mars (SAM) Instrument
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The Sample Analysis at Mars (SAM) instrument, largest of the 10 science instruments for NASA's Mars Science Laboratory mission, will examine samples of Martian rocks, soil and atmosphere for information about chemicals that are important to life and other chemical indicators about past and present environments.
Lifting SAM Instrument for Installation into Mars Rover
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The Sample Analysis at Mars (SAM) instrument, largest of the 10 science instruments for NASA's Mars Science Laboratory mission, will examine samples of Martian rocks, soil and atmosphere for information about chemicals that are important to life and other chemical indicators about past and present environments.
Installing SAM Instrument into Curiosity Mars Rover
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The Sample Analysis at Mars (SAM) instrument, largest of the 10 science instruments for NASA's Mars Science Laboratory mission, will examine samples of Martian rocks, soil and atmosphere for information about chemicals that are important to life and other chemical indicators about past and present environments.
Lowering SAM Instrument into Curiosity Mars Rover
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The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter acquired this image of the Opportunity rover on the southwest rim of "Santa Maria" crater on New Year's Eve 2010, or Martian day (sol) 2466 of the rover's work on Mars.
Mars Orbiter Sees Rover Opportunity at Crater Edge (Annotated)
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The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter acquired this image of the Opportunity rover on the southwest rim of "Santa Maria" crater on New Year's Eve 2010, or Martian day (sol) 2466 of the rover's work on Mars.
Mars Orbiter Sees Rover Opportunity at Crater Edge
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ChemCam Mast Unit Being Prepared for Laser Firing
ChemCam Mast Unit Being Prepared for Laser Firing
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This map indicates some of the geological information gained from orbital observations of Endeavour Crater, which has been the long-term destination for NASA's Mars Exploration Rover Opportunity since mid-2008.
Geologic Map, West Rim of Endeavour Crater, Mars
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