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These images were taken of comet C/2013 A1 Siding Spring by NASA's Mars Reconnaissance Orbiter on Oct. 19, 2014, during the comet's close flyby of Mars and the spacecraft.
First Resolved Image of a Long-Period Comet's Nucleus
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This two-image blink shows a comparison of two exposure times in images from the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity showing comet C/2013 A1 Siding Spring as it flew near Mars on Oct. 19, 2014.
Mars Rover View of Comet (Blink of Two Exposures)
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Researchers used the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity to capture this 10-second-exposure view of comet C/2013 A1 Siding Spring as it passed near Mars on Oct. 19, 2014.
Opportunity's View of Passing Comet (Short Exposure)
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Researchers used the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity to capture this 10-second-exposure view of comet C/2013 A1 Siding Spring as it passed near Mars on Oct. 19, 2014.
Opportunity's View of Passing Comet (Short Exposure - Labeled)
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Researchers used the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity to capture this view of comet C/2013 A1 Siding Spring as it passed near Mars on Oct. 19, 2014.
Mars Rover Opportunity's View of Passing Comet
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Researchers used the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity to capture this view of comet C/2013 A1 Siding Spring as it passed near Mars on Oct. 19, 2014.
Mars Rover Opportunity's View of Passing Comet (Labeled)
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This artist's concept shows NASA's Mars orbiters lining up behind the Red Planet for their "duck and cover" maneuver to shield them fro comet dust that may result from the close flyby of comet Siding Spring (C/2013 A1) on Oct. 19, 2014.
Siding Spring Mars Spacecraft
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This stereo vista from NASA's Mars Rover Opportunity shows Wdowiak Ridge, from left foreground to center, as part of a northward look. The image combines Sept. 17, 2014, views from the left eye and right eye of Opportunity's Pancam to appear three-dimensional when seen through blue-red glasses.
Opportunity's Northward View of 'Wdowiak Ridge' (Stereo)
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This north-looking vista from NASA's Mars Rover Opportunity shows Wdowiak Ridge, from left foreground to center. This version is presented in false color, which enhances visibility of the rover's wheel tracks at right.
Opportunity's Northward View of 'Wdowiak Ridge' (False Color)
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This vista from NASA's Mars Exploration Rover Opportunity shows Wdowiak Ridge, from left foreground to center, as part of a northward look with the rover's tracks visible at right.
Opportunity's Northward View of 'Wdowiak Ridge'
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Three views of an escaping atmosphere, obtained by MAVEN's Imaging Ultraviolet Spectrograph.
MAVEN Observing Water and Carbon Dioxide Breakdown
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NASA's extensive fleet of science assets, particularly those orbiting and roving Mars, have front row seats to image and study a once-in-a-lifetime comet flyby on Sunday, Oct. 19, 2014.
NASA Assets Observing Comet Siding Spring
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This image shows a star field with Mars up at the top, the constellation Scorpius running beneath it and to the left a little bit and the constellation Saturn Libra beneath Scorpius.
View of Comet Siding Spring from Southern Hemisphere
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This graphic shows Mars in the middle with a blue line running from top to bottom of the planet representing the comets flight path. The comet and coma intersect that line at the top of Mars. Three Mars orbiters are hiding behind the planet, away from the comet coma and particles. An orange line/arrow crosses from right to left showing the direction of Mars.
Mars Orbiters 'Duck and Cover' for Comet Siding Spring Encounter
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The tools of the rocket sled trade can be seen in this nighttime shot from the Supersonic Naval Ordnance Research Track (SNORT) at the Naval Air Weapons Station China Lake in California.
Waiting For A Go
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Send your name to fly on Orion's flight test, scheduled to launch Dec. 4 - 6, 2014!
Send Your Name on Orion's Flight Test
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This is an artist concept of an early Earth.
Artist Concept of an Early Earth
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This graph shows Earth and Earth's moon with a blue line in the middle showing Comet Siding Spring and how close it would come to Earth if Mars were Earth.
Comet Siding Springs' Distance From Mars
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This graphic shows the science observations that may be captured by NASA Mars spacecraft during the close encounter with Comet Siding Spring (C/2013 A1).
Comet Siding Spring Planned Science Observations by Mars Spacecraft
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NASA Administrator Charles Bolden (left) and Chairman K. Radhakrishnan of the Indian Space Research Organisation signing documents in Toronto on Sept. 30, 2014 to launch a joint Earth-observing satellite mission and establish a pathway for future joint missions to explore Mars.
NASA and ISRO Signing Documents for Joint Earth-Observing Satellite Mission
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Artist's concept of the NASA-Indian Space Research Organisation's (ISRO) Synthetic Aperture Radar (NISAR) mission, targeted to launch in 2020. NISAR will make global measurements of the causes and consequences of land surface changes.
NASA-ISRO Synthetic Aperture Radar
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This image from the Mars Hand Lens Imager (MAHLI) camera on NASA's Curiosity Mars rover shows the first sample-collection hole drilled in Mount Sharp, the layered mountain that is the science destination of the rover's extended mission.
First Sampling Hole in Mount Sharp
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This image from the Mars Hand Lens Imager (MAHLI) camera on NASA's Curiosity Mars rover shows an example of a type of geometrically distinctive feature that researchers are examining at a mudstone outcrop at the base of Mount Sharp.
Resistant Features in 'Pahrump Hills' Outcrop
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This southeastward-looking vista from the Mast Camera (Mastcam) on NASA's Curiosity Mars rover shows the "Pahrump Hills" outcrop and surrounding terrain seen from a position about 70 feet (20 meters) northwest of the outcrop.
Curiosity Mars Rover's Approach to 'Pahrump Hills'
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This is a gray base map of the skirt of Mount Sharp. In red is the rover's path since landing. Blue stars indication the major stops, Bradbury Landing, Darwin, Cooperstown, Kimberley and Pahrump Hills.
Curiosity's Route from Landing to 'Pahrump Hills'
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