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jueves, 10 de septiembre de 2015

NASA : Methane Painting .- Pintura de metano en Saturno

Hola amigos: A VUELO DE UN QUINDE EL BLOG., hemos recibido información de la Agencia Espacial NASA, sobre una fotografía captada por el satélite Cassini, sobre la atmósfera del planeta Saturno que parece una pincelada oscura, pero su satélite Dione, sigue intacto.
NASA, nos dice: ¿Por qué se ve Saturno como si hubiera sido pintada con un pincel oscura en esta imagen infrarroja, pero Dione parece intacta? Tal vez un artista con gustos muy específicos en paletas?
La respuesta es el metano. Esta imagen fue tomada en una longitud de onda que es absorbida por el metano. Las áreas oscuras se ven aquí en Saturno son regiones con nubes gruesas, donde la luz tiene que viajar a través de más metano en su camino hacia y de regreso de la atmósfera. Desde Dione (698 millas o 1.123 kilómetros de diámetro) no tiene una atmósfera rica en metano el camino de Saturno hace, no experimentar absorción similares - la luz del sol, simplemente rebota en su superficie helada.

More information.............
http://saturn.jpl.nasa.gov/

Saturn and Dione
Why does Saturn look like it's been painted with a dark brush in this infrared image, but Dione looks untouched? Perhaps an artist with very specific tastes in palettes?

The answer is methane. This image was taken in a wavelength that is absorbed by methane. Dark areas seen here on Saturn are regions with thicker clouds, where light has to travel through more methane on its way into and back out of the atmosphere. Since Dione (698 miles or 1,123 kilometers across) doesn't have an atmosphere rich in methane the way Saturn does, it does not experience similar absorption -- the sunlight simply bounces off its icy surface.

Shadows of the rings are seen cast onto the planet at lower right.

This view looks toward Saturn from the unilluminated side of the rings, about 0.3 degrees below the ring plane. The image was taken with the Cassini spacecraft wide-angle camera on May 27, 2015 using a spectral filter which preferentially admits wavelengths of near-infrared light centered at 728 nanometers.

The view was acquired at a distance of approximately 618,000 miles (994,000 kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 84 degrees. Image scale is 37 miles (59 kilometers) per pixel.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit
or
 http://www.nasa.gov/cassini . The Cassini imaging team homepage is at

Credit: NASA/JPL-Caltech/Space Science Institute
Last Updated: Sep. 10, 2015
Editor: Tony Greicius
Tags:  Cassini, Dione, Image of the Day, Jet Propulsion Laboratory, Saturn, Solar System,
NASA
Guillermo Gonzalo Sánchez Achutegui