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Psp_001481_2410_red-00.jpgEolian and Periglacial Activities in Vastitas Borealis (DD Tracks and Polygons)58 visiteThis image shows a region of approximately 7 x 7 km (4.4-by-4.4 miles) located in Vastitas Borealis, part of the Northern Plains.

The surface imaged is relatively young, as indicated by the lack of recent impact craters.
Eolian and Periglacial activity seem to be the dominant geological processes at work, as shown by numerous crisscrossing DD Tracks and ubiquitous polygonal features, respectively.

Dust Devils form when the sun warms up the air near a flat, dry surface. Warm air then rises quickly through the cooler air above and starts spinning, causing a forward motion. The spinning, forward-moving cell may pick up dust and sand as it advances, thus leaving behind a "clean" track. We infer from this image that a thin veneer of light-colored particles of dust and/or fine-grained sand cover relatively darker materials, apparent in the dust devil tracks.

The tracks pictured in this image are in many cases more than 30 mt (27 yards) wide and over 4 Km (2,5 miles) long, surpassing the dimensions of average terrestrial DD tracks.MareKromium

as16-113-18289.jpgAS 16-113-18289 - Earthrise, Lunar Horizon and Casper58 visiteCaption NASA:"Pre-landing photo of Earthrise, with the Command Module visible just above the Lunar Horizon to the left of Earth".MareKromium

OPP-SOL1096-1N225494166EFF79TVP1962L0M1.jpgMartian Horizon (1) - Sol 109658 visitenessun commentoMareKromium

as16-114-18421.jpgAS 16-114-18421 - The interior of Plum Crater (1)58 visitenessun commentoMareKromium

as16-114-18468.jpgAS 16-114-18468 - The "UV" Astronomy Camera58 visitenessun commento

Jupiter-NO-00-022807_3.jpgJupiter! (after New Horizons' Fly-By)58 visitenessun commentoMareKromium

Jupiter_s_Aurorae.jpgJovian Aurorae58 visiteNASA's HST has recently taken images of Jupiter in support of the New Horizons Mission. The images were taken with Hubble's Wide Field Planetary Camera 2 and the Advanced Camera for Surveys. Hubble will continue to photograph Jupiter, as well as its volcanically active moon, Io, over the next month as the New Horizons spacecraft flies past Jupiter. New Horizons is en route to Pluto, and made its closest approach to Jupiter on February 28, 2007. Through combined remote imaging by Hubble and in situ measurements by New Horizons, the two missions will enhance each other scientifically, allowing scientists to learn more about the Jovian atmosphere, the Aurorae, and the charged-particle environment of Jupiter and its interaction with the Solar Wind.
For this photo, the combined ultraviolet- and visible-light images of Jupiter were taken with Hubble from February 17-21. The image segments in the boxes, obtained using the Advanced Camera for Surveys's ultraviolet camera, show auroral emissions that are always present in Jupiter's polar regions. The equatorial regions of Jupiter were imaged in blue light by the Wide Field Planetary Camera 2. Cloud features in Jupiter's main atmosphere are revealed. In the ultraviolet views, the atmosphere looks more hazy because sunlight is reflected from higher in the atmosphere.MareKromium

OPP-SOL1103-1M226103347EFF798DP2936M2M1-01.jpgAfter the removal of a "Berry" (2 - extra-detail mgnf) - Sol 110258 visiteL'ingrandimento che Vi proponiamo è (a nostro parere) piuttosto buono, ma ancora lontano dall'essere definitivamente illuminante: quello che si vede è una superficie a matrice granulare, piena di spazi vuoti (come delle "sacche" o dei "pori") e con al suo interno qualcosa che sembrano dei "filamenti" di colore chiaro, disposti a matassa nella porzione centrale del dettaglio.

La domanda, ovvia, è solo una: stiamo parlando del residuo di un rilievo avente natura "organica"? Ai posteri l'ardua sentenza...1 commenti