HiRISE | Nanedi Vallis: Tributaries and Albedo Changes (PSP_001508

NASA/JPL/University of Arizona

Nanedi Vallis: Tributaries and Albedo Changes
PSP_001508_1850 Science Theme: Composition and Photometry

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This HiRISE image shows a part of Nanedi Vallis, one of the Martian valley networks. The valley networks are thought to have formed by flowing water in the distant past when the climate on Mars was warmer and wetter than it is today.

Some scientists have suggested that the valley networks could have been produced in a climate like the dry, cold one of Mars today if the liquid water was protected by an overlying ice layer. Others think that glacial activity may be responsible for them, but the majority believe that the valley networks are evidence of ancient flowing water.

Valley networks are characterized by their blunt, theater-shaped heads and their approximately constant width along their reaches. They often have tributaries, as seen in this image, that connect with the main trunk of the valley.
Written by: Kelly Kolb (17 March 2010)

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Acquisition date:	21 November 2006	Local Mars time:	3:31 PM
Latitude (centered):	5.0 degrees	Longitude (East):	310.9 degrees
Range to target site:	269.3 km (168.3 miles)	Original image scale range:	from 26.9 cm/pixel (with 1 x 1 binning) to 107.8 cm/pixel (with 4 x 4 binning)
Map projected scale:	25 cm/pixel and North is up	Map projection:	EQUIRECTANGULAR
Emission angle:	2.3 degrees	Phase angle:	50.9 degrees
Solar incidence angle:	53 degrees, with the Sun about 37 degrees above the horizon	Solar longitude:	138.9 degrees, Northern Summer
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North azimuth:	97 degrees	Sub-solar azimuth:	21.8 degrees
For map-projected products
North azimuth:	270 degrees	Sub solar azimuth:	196.5 degrees

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All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible: Image: NASA/JPL/University of Arizona

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For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.