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Message: <blockquote data-quote="KrAzY_iN_LuV" data-source="post: 7468804" data-attributes="member: 210849"><img src="http://media.sacbee.com/static/weblogs/photos/images/2010/may10/nasa2_sm/nasa16.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />       A Subtle Difference -- Subtle  color  differences on Saturn's moon  Mimas are  apparent in this false-color view of Herschel Crater  captured by NASA'sCassini   spacecraft during its closest-ever flyby of that moon.  The image shows terrain-dependent color  variations, particularly the  contrast between the bluish materials in  and around Herschel Crater and  the greenish cast on older, more heavily  cratered terrain elsewhere.  The origin of the color differences is not  yet understood, but may be  caused by differences in the surface  composition between the two  terrains. False color images from Cassini's   previous closest encounter, in 2005, also showed such variations. During   this flyby on Feb. 13, 2010, Cassini came  within about 5,900 miles of Mimas and  these images were obtained with Cassini's narrow-angle camera on that day at a   distance of approximately 10,000 miles from Mimas.   NASA/JPL/Space  Science Institute             <img src="http://media.sacbee.com/static/weblogs/photos/images/2010/may10/nasa2_sm/nasa17.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />      Phobos -- This image of Mars' moon Phobos was  taken by the High Resolution Stereo  Camera (HRSC) on Mars Express. The HRSC  camera is operated by the German  Aerospace Center  and the Mars  Express mission is operated by  the European Space Agency. The HRSC took  this image using the nadir  channel on March 7, 2010, on HRSC Orbit  7915. The image has been  enhanced to bring out the features in the less  illuminated areas. ESA/DLR/FU  Berlin (G. Neukum)            <img src="http://media.sacbee.com/static/weblogs/photos/images/2010/may10/nasa2_sm/nasa18.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />      Eyjafjallajokull Volcano in Infrared   -- On Sat., April 17, 2010, the Advanced Land  Imager (ALI)  instrument aboard NASA's Earth  Observing-1  (EO-1) spacecraft obtained this false-color infrared   image of Iceland's Eyjafjallajokull volcano. A strong thermal source   (denoted in red) is visible at the base of the Eyjafjallajokull plume.   Above and to the right, strong thermal emission is also seen from the   lava flows located at FimmvorduhalsFimmvorduhals  episode was in a location with no ice cap, there was little of the violent  interaction  between lava and water that took place at Eyjafjallajokul  and that  generated the massive volcanic plume.  NASA/JPL/EO-1   Mission/GSFC/Ashley Davies  between March 20 and April 13,  2010, where lava first reached the  surface, generating impressive lava  fountains and lava flows. As the            <img src="http://media.sacbee.com/static/weblogs/photos/images/2010/may10/nasa2_sm/nasa19.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />      Another World -- This other  worldly  landscape is actually Dagze Co, one of many  inland lakes in Tibet. In  glacial times, the  region was considerably wetter, and lakes were  correspondingly much  larger, as evidenced by the numerous fossil  shorelines that circle the  lake and attest to the presence of a  previously larger, deeper lake.  Over millennia changes in climate have  resulted in greater aridity of  the Tibetan Plateau.  NASA/GSFC/METI/ERSDAC/JAROS,   and U.S./Japan ASTER Science  Team             <img src="http://media.sacbee.com/static/weblogs/photos/images/2010/may10/nasa2_sm/nasa20.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />       Proctor Crater, Mars  -- This view from the High Resolution Imaging  Science Experiment (HiRISE)  camera on NASA's  Mars  Reconnaissance Orbiter is of the  Proctor Crater. The relatively bright,  small ridges are ripples. From  their study on Earth,  and close-up  examination by the MER rovers (roving elsewhere on Mars),   scientists surmise that the ripples are composed of fine sand (less  than  200 microns in diameter) or fine sand coated with coarser sand and   granules. This image is a portion of the HiRISE observation taken on   Feb. 9, 2009. The larger, darker bedforms are dunes composed of sand,   most likely of fine size. Ripples tend to move slower than dunes.   Because of this, over time, ripples get covered with dust, possibly   explaining the bright tone visible here. The dunes are dark probably   because they are composed of basaltic sand (derived from dark, volcanic   rock) that is blown by the wind enough that dust does not sufficiently   accumulate to change their color.  NASA/JPL-Caltech/University   of Arizona            <img src="http://media.sacbee.com/static/weblogs/photos/images/2010/may10/nasa2_sm/nasa21.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />      Bright Layered Deposits --  Martian  landforms have been shaped by winds, water, lava flow, seasonal  icing  and other forces over millennia. This view shows color variations  in  bright layered deposits on a plateau near Juventae Chasma in the  Valles  Marineris region of Mars. A brown  mantle  covers portions of the bright deposits. Researchers have found  that  these bright layered deposits contain opaline silica and iron  sulfates.    NASA/JPL-Caltech/University  of Arizona             <img src="http://media.sacbee.com/static/weblogs/photos/images/2010/may10/nasa2_sm/nasa22.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />       Dunes of Mars   -- Dunes of sand-sized materials have been trapped on the floors of   many Martian craters. This is one example, from a crater in Noachis   Terra, west of the giant Hellas impact basin. The High  Resolution Imaging Science Experiment (HiRISE)  camera on NASA's Mars   Reconnaissance Orbiter captured this view on Dec. 28, 2009. The dunes   here are linear, thought to be due to shifting wind directions. In   places, each dune is remarkably similar to adjacent dunes, including a   reddish (or dust colored) band on northeast-facing slopes. Large angular   boulders litter the floor between dunes. NASA/JPL-Caltech/University   of Arizona            <img src="http://media.sacbee.com/static/weblogs/photos/images/2010/may10/nasa2_sm/nasa23.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />       A Burst of Spring  -- Spring has sprung on Mars,   bringing with it the disappearance of carbon dioxide ice (dry ice)  that  covers the north polar sand dunes.  In spring, the  sublimation of the ice (going directly  from ice to gas) causes a host of  uniquely Martian phenomena. In this  image streaks of dark basaltic sand  have been carried from below the  ice layer to form fan-shaped deposits  on top of the seasonal ice. The  similarity in the directions of the fans  suggests that they formed at  the same time, when the wind direction and  speed was the same. They  often form along the boundary between the dune  and the surface below.   NASA/JPL-Caltech/University  of Arizona             <img src="http://media.sacbee.com/static/weblogs/photos/images/2010/may10/nasa2_sm/nasa24.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />      Dry Valleys, Antarctica -- The  McMurdo Dry  Valleys are a row of valleys west of McMurdo  Sound,  Antarctica, so named because of their extremely low humidity  and lack  of snow and ice cover. Photosynthetic bacteria have been found  living  in the relatively moist interior of rocks. Scientists consider  the Dry  Valleys to be the closest of any terrestrial environment to Mars. With its  14 spectral bands from the visible  to the thermal infraredASTER   images Earth to map  and monitor the  changing surface of our planet. ASTER is one  of five Earth-observing  instruments launched  Dec. 18, 1999, on NASA's  Terra satellite.   The broad spectral coverage and high spectral  resolution of ASTER provides  scientists with critical information  for surface mapping and monitoring  of dynamic conditions and temporal  change.  NASA/GSFC/METI/ERSDAC/JAROS,  and  U.S./Japan ASTER Science  Team   wavelength region and its high spatial  resolution of about 50 to 300  feet,            <img src="http://media.sacbee.com/static/weblogs/photos/images/2010/may10/nasa2_sm/nasa25.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />      Hellas Planitia -- This image  from the High Resolution Imaging Science Experiment (HiRISE)   camera on NASA's Mars   Reconnaissance Orbiter covers a small portion of the northwest  quadrant  of Hellas Planitia on Mars. With a   diameter of about 1,400 miles and a depth reaching the lowest elevations   on Mars, Hellas is  one of the largest  impact craters in the solar system. The area has a  number of unusual  features, which are thought to be quite old because of  the high crater  density. The crater inside Hellas has been filled with  material, which  may be related to volcanic activity on the basin's  northwestern rim. It  also might be related to the presence water and  water ice. However,  there is evidence elsewhere that the ground here is  rich with ice. NASA/JPL-Caltech/University  of  Arizona/International Research School of Planetary Sciences              <img src="http://media.sacbee.com/static/weblogs/photos/images/2010/may10/nasa2_sm/nasa27.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />      Cumulonimbus Cloud Over Africa --  High  above the African continent, tall, dense cumulonimbus clouds,  meaning  'column rain' in Latin, are the  result of  atmospheric instability. The clouds can form alone, in  clusters, or  along a cold front in a squall line. The high energy of  these storms is  associated with heavy precipitation, lightning, high  wind speeds and  tornadoes. NASA </blockquote>

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