Archive December 2009
"Wispy Streaks" on Saturn’s moon Rhea
Detailed view
of the wispy trailing hemisphere of Rhea.
The high-resolution images for this 16-frame mosaic across Rhea’s trailing hemisphere were taken by the Cassini spacecraft on November 21, 2009, during its 24,455-kilometer non-targeted encounter with Saturn’s second largest moon. The mosaic shows Rhea’s bright wispy terrain, marked by sets of tectonically formed ice cliffs similar to those of Saturn’s moon Dione, and a part of a large impact basin at the bottom.
Image Credit: NASA/JPL/Space Science Institute/Mosaic by astroarts.org
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Rhea – Crater Upon Crater
Close-up image of Rhea showing numerous craters.
Craters imprinted upon other craters record the long history of impacts endured by Saturn’s moon Rhea. This view looks toward the mid-southern latitudes of the Saturn-facing side of Rhea (1,528 kilometers across). The image was taken by Cassini’s narrow-angle camera on October 13, 2009, from a distance of approximately 45,000 kilometers. Image scale is 262 meters per pixel.
Image Credit: NASA/JPL/Space Science Institute/astroarts.org
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Fog in Valles Marineris
Dense, low lying fog in Valles Marineris.
Image of the western part of Valles Marineris, taken by the High Resolution Stereo Camera (HRSC) on board ESA’s Mars Express spacecraft on May 25, 2004, showing dense ground fog.
This image has not yet been officially released by ESA.
Image Credit: ESA/DLR/FU Berlin (G. Neukum)/astroarts.org
References:
A. Inada et al.: Wavelength Dependency and Angular Effects of Reflectance of Fog in Valles Marineris (PDF; 1.7 MB)
A. Inada et al.: Dust Haze in Valles Marineris observed by HRSC and OMEGA onboard Mars Express (PDF; 1.9 MB)
D. Möhlmann: Adsorption water driven processes on Mars (PDF; 1.7 MB)
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