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Collection:
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NASA Planetary Photo Journal Collection
Collection
NASA Planetary Photo Journal Collection
Collection
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Title:
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Slope Streak South of Olympus Mons
Title
Slope Streak South of Olympus Mons
Title
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Original Caption Released with Image:
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Click on image for larger version This HiRISE image ( PSP_0 03239_1870) reveals slope streaks in an area south of Olympus Mons in the northern hemisphere of Mars. These features are found along the slopes of impact craters, buttes, knobs, ridges, and troughs on Mars. Streaks generally start at a point source and widen downslope, traveling over and sometimes around various obstacles. The subim age
Original_Caption_Rel eased_with_Image
Click on image for larger version This HiRISE image ( PSP_0 03239_1870) reveals slope streaks in an area south of Olympus Mons in the northern hemisphere of Mars. These features are found along the slopes of impact craters, buttes, knobs, ridges, and troughs on Mars. Streaks generally start at a point source and widen downslope, traveling over and sometimes around various obstacles. The subim age
Original Caption Released with Image
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Original Caption Released with Image:
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shows a very wide dark slope that has developed small fingers at its terminus. The dark slope streak does not appear to have relief and does not disturb the pre-existing surface leaving the underlying topography intact beneath its dark trail. This can be seen particularly well near the streak termination. There are also no observable deposits of displaced materials along the terminus.
Surrounding the dark slope streak are multiple ~1 meter deep, triangular faceted scars left behind from avalanched slope materials. The high standing remnant surfaces on either side of the lower scarred surface are clearly visible. Avalanche scars are sometimes found in areas where slope streaks have formed but they are believed to be unrelated. The trail of the dark slope streak appears to cross over the avalanche scars suggesting that the slope streak formed more recently.
Slope streak formation is among the few known processes currently active on Mars. While their mechanism of formation and triggering is debated, they are most commonly believed to form by downslope movement of extremely dry sand or very fine-grained dust in an almost fluidlike manner (analogous to a terrestrial snow avalanche) exposing darker underlying material.
Other ideas include the triggering of slope streak formation by possible concentrations of near-surface ice or scouring of the surface by running water from aquifers intercepting slope faces, briny liquid flows, dry granular flow, mixed water-dust flows, and/or hydrothermal activity.
Observation Toolbox
Acquisition date: 4 April 2007
Local Mars time: 3:35 PM
Degrees latitude (centered): 7.1°
Degrees longitude (East): 218.2°
Range to target site: 274.5 km (171.6 miles)
Original image scale range: 54.9 cm/pixel (with 2 x 2 binning) so objects ~165 cm across are resolved
Map-projected scale: 25 cm/pixel and north is up
Map-projection: EQUIRECTANGULAR
Emission angle: 4.2°
Phase angle: 61.3°
Solar incidence angle: 57°, with the Sun about 33° above the horizon
Solar longitude: 213.6°, Northern Autumn
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, is the prime contractor for the project and 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 and Technology Corp., Boulder, Colo.
Original_Caption_Rel eased_with_Image
shows a very wide dark slope that has developed small fingers at its terminus. The dark slope streak does not appear to have relief and does not disturb the pre-existing surface leaving the underlying topography intact beneath its dark trail. This can be seen particularly well near the streak termination. There are also no observable deposits of displaced materials along the terminus.
Surrounding the dark slope streak are multiple ~1 meter deep, triangular faceted scars left behind from avalanched slope materials. The high standing remnant surfaces on either side of the lower scarred surface are clearly visible. Avalanche scars are sometimes found in areas where slope streaks have formed but they are believed to be unrelated. The trail of the dark slope streak appears to cross over the avalanche scars suggesting that the slope streak formed more recently.
Slope streak formation is among the few known processes currently active on Mars. While their mechanism of formation and triggering is debated, they are most commonly believed to form by downslope movement of extremely dry sand or very fine-grained dust in an almost fluidlike manner (analogous to a terrestrial snow avalanche) exposing darker underlying material.
Other ideas include the triggering of slope streak formation by possible concentrations of near-surface ice or scouring of the surface by running water from aquifers intercepting slope faces, briny liquid flows, dry granular flow, mixed water-dust flows, and/or hydrothermal activity.
Observation Toolbox
Acquisition date: 4 April 2007
Local Mars time: 3:35 PM
Degrees latitude (centered): 7.1°
Degrees longitude (East): 218.2°
Range to target site: 274.5 km (171.6 miles)
Original image scale range: 54.9 cm/pixel (with 2 x 2 binning) so objects ~165 cm across are resolved
Map-projected scale: 25 cm/pixel and north is up
Map-projection: EQUIRECTANGULAR
Emission angle: 4.2°
Phase angle: 61.3°
Solar incidence angle: 57°, with the Sun about 33° above the horizon
Solar longitude: 213.6°, Northern Autumn
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, is the prime contractor for the project and 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 and Technology Corp., Boulder, Colo.
Original Caption Released with Image
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Image Credit:
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NASA/JPL/Univ. of Arizona
Image_Credit
NASA/JPL/Univ. of Arizona
Image Credit
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Produced By:
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University of Arizona/HiRise-LPL
Produced_By
University of Arizona/HiRise-LPL
Produced By
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Mission:
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Mars Reconnaissance Orbiter (MRO)
Mission
Mars Reconnaissance Orbiter (MRO)
Mission
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Spacecraft:
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Mars Reconnaissance Orbiter (MRO)
Spacecraft
Mars Reconnaissance Orbiter (MRO)
Spacecraft
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Target Name:
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Mars
Target_Name
Mars
Target Name
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Is a satellite of:
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Sol (our sun)
Is_a_satellite_of
Sol (our sun)
Is a satellite of
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Instrument:
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HiRISE
Instrument
HiRISE
Instrument
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Product Size:
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2048 samples x 7187 lines
Product_Size
2048 samples x 7187 lines
Product Size
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facet_what:
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Sun
facet_what
Sun
facet_what
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facet_what:
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Mars
facet_what
Mars
facet_what
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facet_what:
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MRO
facet_what
MRO
facet_what
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facet_what:
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Mars Reconnaissance Orbiter (MRO)
facet_what
Mars Reconnaissance Orbiter (MRO)
facet_what
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facet_what:
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High Resolution Imaging Science Experiment (HiRISE)
facet_what
High Resolution Imaging Science Experiment (HiRISE)
facet_what
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facet_where:
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Jet Propulsion Laboratory
facet_where
Jet Propulsion Laboratory
facet_where
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facet_where:
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Denver
facet_where
Denver
facet_where
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facet_where:
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Mars
facet_where
Mars
facet_where
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facet_where:
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Arizona
facet_where
Arizona
facet_where
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facet_where:
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California
facet_where
California
facet_where
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facet_where:
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Washington
facet_where
Washington
facet_where
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facet_where:
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Jet Propulsion Laboratory (JPL)
facet_where
Jet Propulsion Laboratory (JPL)
facet_where
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facet_where:
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Olympus Mons, Mars
facet_where
Olympus Mons, Mars
facet_where
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facet_when:
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April 2007
facet_when
April 2007
facet_when
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facet_when_year:
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2007
facet_when_year
2007
facet_when_year
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Image #:
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PIA09685
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UID:
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SPD-PHOTJ-PIA09685
UID
SPD-PHOTJ-PIA09685
UID
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orignial url:
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orignial_url
orignial url
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