| Piú viste - A Tribute To Mars Global Surveyor |
Craters-Unnamed_Crater-PIA06699-PCF-LXTT.jpgDark Slope Streaks (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)147 visiteCaption NASA:"Dark Slope Streaks are a common feature on the Slopes thickly-mantled by Dust in the Tharsis, Arabia, and Western Amazonis Planitia egions of Mars. Less common are light-toned Slope Streaks, which often occur in the same area as Dark Streaks. They are most common in Arabia Terra, and some are shown in this MGS image. Slope Streaks are probably the result of sudden Avalanches of extremely dry Dust. The behavior of the avalanching dust is somewhat fluid-like and it is a phenomenon often observed during the Martian year.
MareKromium
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Phobos_from_Mgs-011.jpgMartian Limb and Phobos (Natural Colors; credits: NASA/MGS/MSSS)146 visiteUna spettacolare veduta del bordo ("limb") di Marte e della sua luna "misteriosa", Phobos, la quale costituisce anche uno degli oggetti pi "bui" dell'intero Sistema Solare. Ecco il commento originale a questa immagine:
"Phobos is one of the darkest objects in the Solar System. Thus, 4 wide angle images were obtained to make the picture of Phobos over the martian limb: a pair of red and blue wide angle images was acquired for the limb and a pair of separate images were required to see Phobos. The wide angle images illustrate the fact that Phobos is mostly colorless (dark gray); the faint orange/red hue in the wide angle picture is a combination of slight differences in the focal lengths of the blue and red cameras and the orange/red illumination provided by reflection of sunlight off Mars. To a person standing on Phobos, the Red Planet would fill most of the sky".
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Martian_Mountains-MGS-01.jpgCharitum Montes (Natural Colors; credits: NASA/MGS/MSSS)146 visiteCaption originale: "This is a perspective view of the Charitum Montes, the Mountain Range that bounds Southern Argyre Planitia, created by combining red and blue Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) wide angle images with topography from the MGS Mars Orbiter Laser Altimeter (MOLA). Carbon dioxide frost coats some of the hills, craters, and mountainsides in this southern springtime image. The picture is located near 57 South Lat. and 43West Long. North is toward the top, South toward the bottom. Sunlight illuminates the scene from the upper left. The area shown is about 355 Km. A smaller portion of this image was previously released in July 2003 as "Frosty Mountains."
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Hellas_Planitia.jpgHellas Planitia in Winter (Natural Colors; credits: NASA/MGS/MSSS)144 visite"This picture captures two dust storms, each large enough to cover Arizona or New Mexico. One is located near the lower left, the other at the lower right. Taken on April 8, 2001 (Mid-Southern Winter), this is a mosaic of six MOC daily global images centered around Hellas Planitia in the Martian Southern Hemisphere. Hellas Planitia is the dominant elliptical feature just below the center of the picture. The bright, nearly white surfaces along the lower (southern) edge of the picture are covered by wintertime frost. The strong temperature difference between the winter frost and the warmer air just off the edge of this Polar Cap generates winds that - at this time of year - are often strong enough to lift Dust into large, reddish-brown, billowy clouds".
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Chasmas-Eos_Chasma-M1200712-01.jpgDustfalls in Eos Chasma (2 - Original NASA/MGS/MSSS b/w - EDM n.1)143 visitenessun commento
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Craters-Tikhonravov_Crater-PIA03962-01.jpgSedimentary Rocks inside Tikhonravov Crater - Arabia Terra (Saturated Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)143 visiteCaption NASA originale:"This MGS-MOC image shows Layered Sedimentary Rocks exposed by erosion, then mantled by Dust, in Tikhonravov Crater in central Arabia Terra. Dark Slope Streaks occur where some of the Dust has slid down the layered Slopes".
Location near: 13,8 North Lat. and 324,8 West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern AutumnMareKromium
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Martian_Limb-MGS-E23-00100_limb-01.jpgMartian Limb, Clouds, Haze and Outer Space (Original NASA/MGS/MSSS b/w Frame)139 visiteCaption originale:"Mars Global Surveyor orbits the Red Planet 12 times each day. Half of each orbit is spent on the day side of Mars, which is where most Mars Orbiter Camera images are obtained because sunlight is required to illuminate the Surfaces being observed. However, on the night side of Mars, the wide angle cameras can see clouds and hazes above the sunward Martian Limb. This blue wide angle camera image, obtained on the night side of Mars on May 15, 2003, shows Clouds picking up the first sunlight before dawn near 55 North Latitude. The scene is illuminated by sunlight from the right. The Sun is actually on the other side of the Planet and has not yet risen over this Region. The dark area on the left side of the picture is the Martian Surface at night. The dark band on the right side is Outer Space. The bright features just right of center are the Clouds hanging above the Martian Limb over Mars' Northern Plains. North is up and the Spacecraft was moving Southward when the image was acquired".
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Ares_Vallis-M1104220Det.gifAres Vallis137 visitenessun commento
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Craters-Crater_Cluster-Meridiani_Planum-PIA07151_modest-01.jpgCrater Cluster in Meridiani Planum (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)137 visitenessun commentoMareKromium
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Craters-Crater_Cluster-Meridiani_Planum-PIA07151_modest-00.jpgCrater Cluster in Meridiani Planum (Original NASA/MGS/MSSS b/w Frame)135 visiteUna piccola porzione di Meridiani Planum, caratterizzata da un grande ed antico cratere (in alto) e da una moltitudine di crateri pi piccoli che tanto ci ricordano il Cratere Endurance. certo, sarebbe bello andare a dare un'occhiata a questo strano paesaggio dal basso ma...Opportunity troppo lontana e, in questa zona, quasi certamente, non ci arriver mai.
Ma poi, in fondo, chiss...
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Craters-Unnamed_Crater-North_Polar_Regions-MGS-2.jpgUnnamed Crater in the Northern Plains (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)134 visitenessun commentoMareKromium
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Channels-Unnamed_Channel_near_Cydonia_Region-PIA07272-00.jpgArabia Terra, near Cydonia Region: the "Sphynx" River (Original NASA/MGS/MSSS b/w Frame)133 visiteE' davvero gratificante (e difficile) commentare immagini di simile impatto e bellezza: stiamo osservando il letto, ormai prosciugato (ma con degli abbondanti depositi di "qualcosa" che rimasto adagiato e ben visibile sul fondo - forse fango?), di un antico fiume Marziano. Siamo nella pianura conosciuta come Arabia Terra, in prossimit della famosissima Cydonia Mensae.
Dato che questo fiume (a quanto ne sappiamo) passa attraverso la Regione di Cydonia, abbiamo deciso di chiamarlo, in omaggio ai "monumenti" che molti pensano si trovino in quella misteriosa zona di Marte, "Sphynx River": il Fiume della Sfinge.
Con buona pace, ovviamente, degli Amici della NASA...
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