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Inizio > MARS > Mars Reconnaissance Orbiter (MRO)

Ultimi commenti - Mars Reconnaissance Orbiter (MRO)

PSP_008982_1965.jpgLayered Deposits in Arabia Terra Region (True Colors; credits: Dr M. Faccin & Lunexit)56 visiteThis image shows the floor of an Unnamed Impact Crater in Arabia Terra that has Layered Deposits. There are many craters in this Region where layering is observed.

These layers are often exposed along the sides of large isolated mounds, small knobs and mesas, and other positive relief features. In some cases, the layering is expressed as narrow sinuous ridge-like structures along crater floors.
The presence of Layered Deposits is of particular interest because these materials are not likely to be related to the impact event, but rather post-impact infill of the crater. Modification of the deposits has now revealed layers of material.

HiRISE and other instruments onboard the Mars Reconnaissance Orbiter may provide more clues to the origin of the these deposits.3 commentiMareKromium08/11/08 at 14:32walthari: prendo occasione dal tuo commento per chiarire ch...

PSP_008982_1965.jpgLayered Deposits in Arabia Terra Region (True Colors; credits: Dr M. Faccin & Lunexit)56 visiteThis image shows the floor of an Unnamed Impact Crater in Arabia Terra that has Layered Deposits. There are many craters in this Region where layering is observed.

These layers are often exposed along the sides of large isolated mounds, small knobs and mesas, and other positive relief features. In some cases, the layering is expressed as narrow sinuous ridge-like structures along crater floors.
The presence of Layered Deposits is of particular interest because these materials are not likely to be related to the impact event, but rather post-impact infill of the crater. Modification of the deposits has now revealed layers of material.

HiRISE and other instruments onboard the Mars Reconnaissance Orbiter may provide more clues to the origin of the these deposits.3 commentiMareKromium08/11/08 at 13:05John Koenig: Anche qui io sono attratto verso la possibilit? ch...

Mawrth_Vallis-The_Pyramid-GIF.gifZooming on a "Pseudo-Pyramid" - Mawrth Vallis (GIF-Movie, by Carlo Contu)62 visiteAcquisition date: January, 05, 2007
Local Mars Time: 15:32
Latitude: 22,5° North
Longitude: 341,8° East
Range to target site: 286,8 Km
Original image scale range: 28,7 cm/pixel (with 1 x 1 binning) so objects ~86 cm across are resolved
Emission angle: 6,3 °
Phase angle: 59,4 °
Solar incidence angle: 53°, with the Sun about 37° above the horizon 14 commentiMareKromium08/07/08 at 11:37walthari: per quanto possa essere "strano" ? un ri...

North_Polar_Regions-Chasma_Boreale-PIA01926-det.jpgThe Walls of Chasma Boreale80 visiteThe Martian terrain in this remarkable image is at the head of a large chasm, named Chasma Boreale, which cuts through Mars' North Polar Layered Deposits (MNPLD). These ice-rich layered deposits are about 3000 mt (about 9.800 feet) thick and 1000 Km (1.600 miles) across, much like the Greenland ice-sheet on Earth. The head of Chasma Boreale ends in a steep icy cliff more than 1000 mt (about 3300 feet) high. The cliff has both light- and dark-toned layers, seen at right in this image. The image was taken by the HiRISE camera on NASA's MRO. The internal layers of the ice-sheet are visible in the cliff walls. The dark-toned flat area in the center and left of the image is the floor of this chasm, which contains many craters.
Scientists have proposed that Chasma Boreale was formed by a catastrophic flood that began under the ice-sheet and was later widened by wind erosion. However, the large number of craters on the chasm's floor implies that the floor is much older than the ice sheet. These craters should have been removed by the suggested flood; their presence has caused some Mars researchers to instead speculate that no large flood occurred and that Chasma Boreale was not covered with very much ice.

In addition to layered ice, there is also some material within the north polar layered deposits that appears to be composed of sand. The dark material near the base of the cliff wall is thought to be aprons of debris being eroded from sand-rich layers. Zooming in on this dark material with HiRISE reveals ripples, which are diagnostic of moving sand.

Some bright spots of material visible on the cliff wall were not present in previous years. These are likely patches of water frost. Each year layers of carbon dioxide and water frost coat this terrain before being removed during the summer. The water frost lasts longer, and patches that are shaded by nearby steep topography (such as this one) can persist even into late summer.

An unexpected surprise, not visible with previous camera resolutions, is the fragmentation of the exposed surfaces of these icy layers into polygonal blocks. These blocks appear to be breaking away from the layer margins and forming boulder-sized debris, which then rolls down slope (a process called mass-wasting). These boulders are likely to be large blocks of dusty water ice; once separated from the main ice-sheet they can be eroded away by sunlight. More boulder-sized objects are visible out in the floor of the chasm. Polygons are also visible throughout the chasm floor, indicating that water-ice is just below the surface.
Image TRA_000845_2645 was taken by the HiRISE camera on Oct. 1, 2006. The complete image is centered at 84.6 degrees latitude, 3.4 degrees east longitude. The range to the target site was 316 kilometers (198 miles). At this distance the image scale is 63 centimeters (25 inches) per pixel (with 2 x 2 binning), so objects about 186 centimeters (73 inches) across are resolved. The image shown here has been map-projected to 50 centimeters (20 inches) per pixel. North is up. The image was taken at a local Mars time of 3:34 p.m. and the scene is illuminated from the west with a solar incidence angle of 62.3 degrees, thus the sun was about 27.7 degrees above the horizon. At a solar longitude of 114.3 degrees, the season on Mars is northern summer. 1 commenti08/03/08 at 10:17John Koenig: Stratificazioni!

Mawrth_Vallis-The_Pyramid-HSol.jpgThe "Pseudo-Pyramid" of Mawrth Vallis (credits: Dr M. Faccin)96 visiteEd ecco qui, in versione a colori naturali ed extra-magnificata, la pseudo-piramide di Mawrth Vallis.

Opera della Natura? Opera "Artificiale"? Secondo noi, si tratta di un rilievo assolutamente particolare, questo è certo, e quindi da studiare. Ma il fatto di scendere ulteriormente in dettaglio e parlare di "artificialità", visti gli elementi (scarsissimi!) che abbiamo a disposizione, a nostro - onesto - parere, sembra eccessivo (e l'idea di restare colpiti anche noi dalla "Sindrome di' Hoagland", sinceramente, non ci riempie di gioia...).

Sempre complimenti al Dr Faccin per l'elaborazione ed all'ottimo Carlo Contu, per l'individuazione del rilievo.22 commentiMareKromium07/31/08 at 18:12Ufologo: Contaccambio l'abbraccio PCF! Ma sai, un po il...

Mawrth_Vallis-The_Pyramid-HSol.jpgThe "Pseudo-Pyramid" of Mawrth Vallis (credits: Dr M. Faccin)96 visiteEd ecco qui, in versione a colori naturali ed extra-magnificata, la pseudo-piramide di Mawrth Vallis.

Opera della Natura? Opera "Artificiale"? Secondo noi, si tratta di un rilievo assolutamente particolare, questo è certo, e quindi da studiare. Ma il fatto di scendere ulteriormente in dettaglio e parlare di "artificialità", visti gli elementi (scarsissimi!) che abbiamo a disposizione, a nostro - onesto - parere, sembra eccessivo (e l'idea di restare colpiti anche noi dalla "Sindrome di' Hoagland", sinceramente, non ci riempie di gioia...).

Sempre complimenti al Dr Faccin per l'elaborazione ed all'ottimo Carlo Contu, per l'individuazione del rilievo.22 commentiMareKromium07/31/08 at 11:44Paolo C. Fienga: Carissimo Max...hai scordato una "s"... ...

Mawrth_Vallis-The_Pyramid-HSol.jpgThe "Pseudo-Pyramid" of Mawrth Vallis (credits: Dr M. Faccin)96 visiteEd ecco qui, in versione a colori naturali ed extra-magnificata, la pseudo-piramide di Mawrth Vallis.

Opera della Natura? Opera "Artificiale"? Secondo noi, si tratta di un rilievo assolutamente particolare, questo è certo, e quindi da studiare. Ma il fatto di scendere ulteriormente in dettaglio e parlare di "artificialità", visti gli elementi (scarsissimi!) che abbiamo a disposizione, a nostro - onesto - parere, sembra eccessivo (e l'idea di restare colpiti anche noi dalla "Sindrome di' Hoagland", sinceramente, non ci riempie di gioia...).

Sempre complimenti al Dr Faccin per l'elaborazione ed all'ottimo Carlo Contu, per l'individuazione del rilievo.22 commentiMareKromium07/30/08 at 14:24Gianluigi: Horas tibi serenas, et cura ut valeas!

Mawrth_Vallis-The_Pyramid-HSol.jpgThe "Pseudo-Pyramid" of Mawrth Vallis (credits: Dr M. Faccin)96 visiteEd ecco qui, in versione a colori naturali ed extra-magnificata, la pseudo-piramide di Mawrth Vallis.

Opera della Natura? Opera "Artificiale"? Secondo noi, si tratta di un rilievo assolutamente particolare, questo è certo, e quindi da studiare. Ma il fatto di scendere ulteriormente in dettaglio e parlare di "artificialità", visti gli elementi (scarsissimi!) che abbiamo a disposizione, a nostro - onesto - parere, sembra eccessivo (e l'idea di restare colpiti anche noi dalla "Sindrome di' Hoagland", sinceramente, non ci riempie di gioia...).

Sempre complimenti al Dr Faccin per l'elaborazione ed all'ottimo Carlo Contu, per l'individuazione del rilievo.22 commentiMareKromium07/30/08 at 13:52MareKromium: Ave Gigi: in errore versari - puto, prae misera me...

Mawrth_Vallis-The_Pyramid-HSol.jpgThe "Pseudo-Pyramid" of Mawrth Vallis (credits: Dr M. Faccin)96 visiteEd ecco qui, in versione a colori naturali ed extra-magnificata, la pseudo-piramide di Mawrth Vallis.

Opera della Natura? Opera "Artificiale"? Secondo noi, si tratta di un rilievo assolutamente particolare, questo è certo, e quindi da studiare. Ma il fatto di scendere ulteriormente in dettaglio e parlare di "artificialità", visti gli elementi (scarsissimi!) che abbiamo a disposizione, a nostro - onesto - parere, sembra eccessivo (e l'idea di restare colpiti anche noi dalla "Sindrome di' Hoagland", sinceramente, non ci riempie di gioia...).

Sempre complimenti al Dr Faccin per l'elaborazione ed all'ottimo Carlo Contu, per l'individuazione del rilievo.22 commentiMareKromium07/30/08 at 12:56Gianluigi: Ave Paulus! Sed non est "...Versus scribere m...

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