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PrometheiPlanum.jpgPromethei Terra (Natural Colors + MULTISPECTRUM; credits: ESA & Lunexit)58 visitePromethei Planum, an area seasonally covered with layer of ice more than 3500 mt thick layer of ice in the Martian South Polar Region, was the subject of the High Resolution Stereo Camera’s focus on 22 September 2005 as Mars Express was in orbit above the Red Planet.
Promethei Planum lies at approx. 76° South Lat. and 105° East Long.
An approx. 100 Km-large and 800 mt-deep impact crater is visible in the Northern part of the image. The crater’s interior is partly covered in ice.
In the centre of the image are structures that may have been created by basaltic lava flow from a volcano. This area is covered in ice. The dark dunes towards the bottom of the image are most likely made up of dust originating from this lava flow or volcanic ash.
A broad sheet of ice, which is an extension of the South Polar Ice Cap is located South of the lava flow. The steep flanks clearly show white, clean ice. The thickness of the ice is between 900 and 1100 mt.MareKromium
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HD-189733b-PIA10364.jpgHD-189733b - Exoplanet in Vulpecula58 visite"...Vulpes non capitur muneribus..."
(Proverbio Medioevale)
"...L'astuzia non si lascia vincere (non la si può corrompere) dai (con) regali..." (trad. libera)MareKromium
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HD-189733b.jpgHD-189733b - Exoplanet in Vulpecula58 visite"...Saepe condita luporum fiunt rapinae vulpium..."
(Proverbio Medioevale)
"...Sovente le volpi riescono a sottrarre anche le prede nascoste dai lupi..." (trad. libera)MareKromium
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NGC-2808-The_Region.jpgLooking towards the Centaurus Region58 visite"...Vetera extollimus, recentium incuriosi..."
(Tacito)
"...Magnifichiamo l'antichità e trascuriamo l'attualità..."MareKromium
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NGC-2808-1.jpgNGC 2808 - Omega Centauri (Globular Star Cluster)58 visite"...In culpa est animus, qui se non effugit unquam..."
(Orazio)
"...Un animo consapevole non può sfuggire a se stesso..." (trad. libera)
Nota per i Lettori: ho tradotto "in culpa" come se stesse a significare "nella consapevolezza". Non è una svista, ma una semplice interpretazione personale.MareKromium
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Craters-Pollack_Crater-H1201_0001_ND3_crop_wide-0.jpgPollack Crater and "White Rock" (RAW Frame; credits: ESA - Mars Express)58 visitenessun commentoMareKromium
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Craters-Pollack_Crater_and_White_Rock-20020419a-PCF-LXTT.jpgPollack Crater and "White Rock" (Slightly Saturated Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)58 visiteCaption NASA:"White Rock is the unofficial name for this unusual landform which was first observed during the Mariner 9 Mission in the early 70's. As later analysis of additional data sets would show, White Rock is neither white nor dense rock. Its apparent brightness arises from the fact that the material surrounding it is so dark. Images from the Mars Global Surveyor MOC camera revealed dark sand dunes surrounding White Rock and on the floor of the troughs within it.
Some of these dunes are just apparent in the THEMIS image. Although there was speculation that the material composing White Rock could be salts from an ancient dry lakebed, spectral data from the MGS TES instrument did not support this claim. Instead, the White Rock deposit may be the erosional remnant of a previously more continuous occurrence of air fall sediments, either volcanic ash or windblown dust.
The THEMIS image offers new evidence for the idea that the original deposit covered a larger area.
Approximately 10 Km to the South-East of the main deposit are some tiny knobs of similarly bright material preserved on the floor of a small crater. Given that the eolian erosion of the main White Rock deposit has produced isolated knobs at its edges, it is reasonable to suspect that the more distant outliers are the remnants of a once continuous deposit that stretched at least to this location.
The fact that so little remains of the larger deposit suggests that the material is very easily eroded and simply blows away".MareKromium
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O-Mariner9-72-Pollack_Crater_and_White-Rock.jpgPollack Crater and "White Rock" from Mariner 9 (RAW Frame - credits: NASA)58 visite"...It was interesting to browse through the Mariner 9 data set to locate these images, because evidently the Mariner 9 Team wasn't sure to make of these strange bright deposits.
The first one I posted was described as "white rock" in a comment on the image, and that name has stuck. But another image's descriptive comment read "curious ice patches".
Another totally misidentified not only the nature but the location of the photo, describing it as "Polar Cap".
Comments on images of other places in the Mariner 9 Catalog generally reflect the fact that Mars had not yet been systematically surveyed by an orbiter, so the scientists often weren't quite sure what they were looking at, and even when it was clear there were craters, those craters had mostly not yet been named.
I came across comments like "peculiar filametary structure" and "possible craters" and "streaky detail" and "cloud?" and "multitude of surface detail" and "odd fork-shaped bright pattern."
It's fun to browse through that table and imagine surveying Mars, with a spacecraft stationed at the Planet for the first time, made all the more dramatic by its initial obscuration by a dust storm that slowly cleared.
Mariner 9 is one of the more challenging data sets to work with because it's just so old. However, everything you need to access it, find images, view them, and convert them to more familiar formats is readily available online. First of all, the data itself can be found by browsing the data volumes at the PDS Imaging Node, and you can learn a little bit about the data at the National Space Science Data Center. To figure out what's what and to try to track down images of specific areas, you can download this spreadsheet (XLS format, zipped, 7.5 MB) containing an index to all the images.
The images are all in a format that won't be familiar to most of you, but like most spacecraft data you can convert a folder full of images to PNG format using my favorite amateur-produced software, Björn Jónsson's IMG2PNG. However, if you're only working with a couple of images, I'd recommend a different amateur-produced piece of software for converting the images, Piotr Masek's MarinerView, because MarinerView can be used to correct the Mariner 9 images (one at a time) for the little white specks of noise that are spattered across every one.
I'm slowly working on tracking down images of "White Rock" taken by every mission. First Mariner 9, then the Viking orbiters, then Mars Global Surveyor's MOC, then Mars Odyssey THEMIS, then Mars Express HRSC, and, finally, I should be able to produce Mars Reconnaissance Orbiter views from three different instruments: HiRISE, CTX, and CRISM. Stay tuned for further installments...".
Emily Lakdawalla (Planetary Society)MareKromium
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SOL1008-MIC-01.jpgPebbles in the "wet" (?) Martian Sand... - Sol 1008 (True Colors; credits: Dr M. Faccin)58 visiteUn altro SPLENDIDO Lavoro del Dr Faccin, che ci porta - a nostro parere - ancora un pò più vicini alla realtà di Marte. Una realtà che, per innumerevoli motivi e colpe (anche nostre, ovviamente), se ne sta ancora "sotto la sabbia" del Pianeta più famoso del Sistema Solare...
Ma, come vedete bene in questo frame, piano-piano, stiamo "smuovendo" quella sabbia (ci viene da dire "palesemente umida"...) sotto la quale, forse, si cela una grandissima Sorpresa...
Comunque, diamo tempo al Tempo, et procedemus!...MareKromium
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OPP-SOL569-1.jpgRover Tracks and Martian Paving - Sol 569 (True Colors + MULTISPECTRUM; credits: Dr G. Barca & Lunexit)58 visitenessun commentoMareKromium
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SOL1287-0.jpgRobotic Arm At Work! - Sol 1287 (True Colors; credits: Dr M. Faccin)58 visitenessun commentoMareKromium
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Enceladus-IMG003035.jpgNot for Human Eyes... (by Karl Kofoed)58 visiteCaption NASA:"In this artist's rendering, a distant Sun forms a halo (refracted sunlight by ice crystals) amid streamers of pure water ice particles, which spew into space from cracks in the South Polar surface of Saturn's tiny moon Enceladus". MareKromium
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