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jueves, 9 de junio de 2016

NASA : Frosted Dunes on Mars .- Heladas dunas en Marte

http://www.nasa.gov/image-feature/frosted-dunes-on-mars

Closeup of frosted sand dunes on surface
Sand dunes cover much of this terrain, which has large boulders lying on flat areas between the dunes. It is late winter in the southern hemisphere of Mars, and these dunes are just getting enough sunlight to start defrosting their seasonal cover of carbon dioxide. Spots form where pressurized carbon dioxide gas escapes to the surface. 
 
This image was taken on March 27, 2016, at 15:31 local Mars time by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter. The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colo. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.
Image Credit: NASA/JPL/University of Arizona
Caption: Alfred McEwen
Last Updated: June 7, 2016
Editor: Sarah Loff
NASA
Guillermo Gonzalo Sánchez Achutegui
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