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11.15.2016 Schiaparelli Impact Site on Mars, Stereo
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03.30.2016 Erisa Hines
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03.21.2016 For a Decade Orbiting Mars: One Recent View
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03.09.2016 Mars Reconnaissance Orbiter By the Numbers
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11.16.2015 Change Observed in Martian Sand Dune
10.05.2015 'The Martian' Story's Ares 4 Landing Site
10.05.2015 The Ares 3 Landing Site (Figure A)
09.30.2015 Avalanche Ho!
06.29.2015 Mars Exploration Zone Layout Considerations
06.17.2015 Active High-Latitude Dune Gullies
06.03.2015 Crisp Crater in Sirenum Fossae
05.20.2015 Sedimentary Rock Layers on a Crater Floor
05.20.2015 Honey, I Shrunk the Mesas
05.11.2015 Icy Wonderland
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03.25.2015 Pitted Landforms in Southern Hellas Planitia
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02.18.2015 Lava Flow Near the Base of Olympus Mons
02.09.2015 Yardangs in Arsinoes Chaos, Mars
02.04.2015 Curiosity Rover at 'Pahrump Hills'
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Graben Cutting Lava Flow in TharsisThis 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. The image covers an area about 6 kilometers (4 miles) wide.
Relations like this can be used to establish the relative ages of features on the surface. The graben is from the upper left to middle right of the image. The lava flow is from lower left to upper right. In this case, the trough cuts the lava flow, indicating that it is younger. If the trough existed when the flow occurred, lava would have spilled into and flooded it before the flow was able to proceed to the north.
Another interesting feature in this lava flow is the trace of a central channel, indicated by two roughly parallel linear features within the flow. After the first lava flowed across this area, the rest of the flow was probably concentrated in this inner channel. The channel was still full of lava when the flow stopped, and so the surface is still at the same height as the rest of the flow.
This image is one product from an Oct. 13, 2010, HiRISE observation catalogued as ESP_019747_1975, of an area centered at 17.4 degrees north latitude, 235.9 degrees east longitude. Other image products from this observation are available at http://hirise.lpl.arizona.edu/ESP_019747_1975.
NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems, Denver, built the spacecraft. The High Resolution Imaging Science Experiment is operated by the University of Arizona, Tucson, and the instrument was built by Ball Aerospace & Technologies Corp., Boulder, Colo.
Image Credit: NASA/JPL-Caltech/University of Arizona