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jueves, 8 de octubre de 2015

NASA :All Along the Fractures .- A lo largo de las Fracturas

Hola amigos: A VUELO DE UN QUINDE EL BLOG., The High Resolution Imaging Science Experiment (HiRISE);  de la cámara a bordo del Orbitador de Reconocimiento de Marte de la NASA;  toma a menudo imágenes de las dunas de arena de Marte,  para estudiar los suelos móviles. Estas imágenes proporcionan información acerca de la erosión y el movimiento de material de la superficie, sobre los patrones de viento y tiempo, incluso de los granos del suelo y tamaños de grano. Sin embargo, mirando más allá de las dunas, estas imágenes también revelan la naturaleza del sustrato debajo.
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Dunes on the surface of Mars photographed in close by the Mars Reconnaissance Orbiter
The High Resolution Imaging Science Experiment (HiRISE) camera aboard NASA's Mars Reconnaissance Orbiter often takes images of Martian sand dunes to study the mobile soils. These images provide information about erosion and movement of surface material, about wind and weather patterns, even about the soil grains and grain sizes. However, looking past the dunes, these images also reveal the nature of the substrate beneath.
Within the spaces between the dunes, a resistant and highly fractured surface is revealed. The fractured ground is resistant to erosion by the wind, and suggests the material is bedrock that is now shattered by a history of bending stresses or temperature changes, such as cooling, for example.
Alternately, the surface may be a sedimentary layer that was once wet and shrunk and fractured as it dried, like gigantic mud cracks. In either case, the relative small and indistinct fractures have trapped the dark dune sand marching overhead. Now the fractures have become quite distinct, allowing us to examine the orientation and spacing of the fractures to learn more about the processes that formed them.
This view is one image product from HiRISE observation ESP_042223_1890, taken July 30, 2015, at 2:33 p.m. local Mars time, 8.719 degrees north latitude, 67.347 degrees east longitude.
HiRISE is one of six instruments on the Mars Reconnaissance Orbiter. The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colorado. 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. Lockheed Martin Space Systems, Denver, built the orbiter and collaborates with JPL to operate it.
Image Credit: NASA/JPL-Caltech/University of Arizona
Caption: Mike Mellon
Last Updated: Oct. 7, 2015
Editor: Sarah Loff
NASA
Guillermo Gonzalo Sánchez Achutegui
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