| Risultati della ricerca nelle immagini - "dunes," |
Craters-Holden_Crater-1-PIA03192.jpgHolden Crater's Dunes (1)53 visiteOriginal caption:"These dunes occur on the floor of Holden Crater".
Image information: VIS instrument;
Latitude: 25,8° S;
Longitude: 326,5° E:
Resolution: 17 meter/pixel.
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Craters-Holden_Crater-2-PIA03192.jpgHolden Crater's Dunes (2)53 visiteProsieguo del frame precedente; nessun commento.
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Dunes-PaleoDunes-1.jpgPaleodunes (1 - Original NASA/MGS/MSSS b/w Frame)53 visiteCaption NASA:"A pair of MGS-MOC images shows close-up views of a Sand Dunefield that was first detected by the Viking Orbiters in the late 1970's. What is surprising about the MOC images is that they reveal a dune field unlike any other thus far seen on Mars: this one has Impact Craters on its Surface, and LOTS of them! The field of parallel Ridges North of the Dunefield is a wind-eroded material named "Apollinaris Sulci". It is possible that the Dunefield shown here was once covered by this wind-eroded material and was later exhumed. Regardless, the Dunes were somehow hardened and have been exposed as hard rock on the Martian Surface long enough for many Impact Craters smaller than a few hundred meters (such as few hundred yards) across to form. These Dunes are therefore quite ancient: one might say that this is a 'fossilized' Dunefield".
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Dunes-PaleoDunes-2.JPGPaleodunes (2 - Original NASA/MGS/MSSS b/w Frame)53 visiteCaption NASA:"A similar effect at a much smaller scale can be seen by examining some Sandstones and Siltstones on Earth (if conditions were right, ripples formed in either water or wind are preserved in such rocks). The first MOC view, labeled M03-00006, was taken on July 1, 1999. The second view, M07-05007, was acquired September 26, 1999. Both MOC images are illuminated from the left. The Dunefield is located East of the Apollinaris Patera volcano and North-East of Gusev Crater (at about 12,5° South Lat. and 181° West Long.)".
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Dunes-PaleoDunes-3.JPGPaleodunes (3 - Original NASA/Viking 2 Project b/w Frame)53 visitenessun commento
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North_Polar_Features-Dunes-MGS-03.JPGNorth Polar Dunes (Original NASA/MGS/MSSS b/w Frame)65 visiteCaption NASA originale:"This MGS-MOC image shows dunes covered with a seasonally-deposited layer of solid Carbon Dioxide (CO2) in the North Polar Region of Mars. The dark spots indicate areas where the CO2 frost has begun to change, either by being sublimed away, or by becoming rougher or coarser-grained, such that it appears darker than surrounding frost. Over the course of the Spring season, the frost will be completely removed and the dark sands that make up the dune field will be visible by Summer".
Location near: 77,7° North; 41,7° West
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Spring
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OPP-SOL058-xpe_pubeng_approved_032204_outside_eagle-B058R1.jpgOutside Eagle Crater: small Side-Winders, back-shell & parachute - Sol 5877 visiteCaption NASA originale:"This image from Opportunity is part of the first set of pictures that was returned to Earth after the Rover exited Eagle Crater. Scientists are busy analyzing Opportunity's new view of the plains of Meridiani Planum. The plentiful ripples are a clear indication that wind is the primary geologic process currently in effect on the plains. On the left of the image are two depressions - each about 1 mt across - that feature bright spots in their centers. One possibility is that the bright material is similar in composition to the rocks in Eagle Crater's outcrop and the surrounding darker material is what's referred to as "lag deposit," or erosional remnants that are much harder and more difficult to wear away".
Nota: alcuni Ricercatori hanno pensato che quelle 2 depressioni con 'qualcosa' che emerge dal loro centro sìano due affioramenti di acqua. La NASA, al riguardo, oltre a quello che avete letto nella "Caption", non ha - per quanto ne sappiamo - mai aggiunto altro.
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OPP-SOL059-1F133421802EDN0830P1111R0M1_MtBlanc-B064R1.jpgMont Blanc - Sol 5977 visiteCaption NASA originale:"This image taken by the H.A. Camera on the Rover Opportunity shows the Rover investigating a bright patch of soil dubbed "Mont Blanc".
The Rover used its Microscopic Imager, located on the instrument deployment device, or arm, to take pictures of Mont Blanc on Sol 59 (such as 2 sols after it exited Eagle Crater). Later, Opportunity observed the spot with its Moessbauer and Alpha Particle X-ray Spectrometers, also located on the arm.
Though Mont Blanc appears unusually bright amidst the dark plains of Meridiani Planum, scientists believe it is the same red dust that blankets most of the surface of Mars.
The soil patch appears to have collected downwind of Eagle Crater. The Rover is facing Northwest".
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OPP-SOL071-1N134495215EFF0922P1970R0M1.jpgSide-Winders, on Sol 71122 visiteGuardate questo frame del Sol 71 di Opportunity: si tratta di una vista relativamente ravvicinata dell'oceano di Side-Winders che circondano il Rover mentre si sta spostando da Anatolia verso il Cratere Endurance. Osservate bene le "dunette sinuose" che si vedono in questo frame e poi andate a dare un'occhiata ai Side-Winders che circondano Opportunity mentre viaggia e raggiunge il Cratere Vostok. In linea d'aria, fra questa zona di Meridiani Planum e quella dove si trova il sepolto Cratere Vostok ci saranno circa 2,5/3 Km (più o meno): due zone (relativamente) vicine, eppure i paesaggi che vediamo ci sembrano molto diversi.
Voi che ne dite?!?
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OPP-SOL1402-1N252648246EFF8826P0655L0M1-2.jpgVictoria, under clouds of Dust and Fogs... - Sol 1402 (MULTISPECTRUM; credits: Lunexit)54 visitenessun commentoMareKromium
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OPP-SOL187-1.jpgThe Dunes of Endurance Crater - Sol 187 (Approximate True Colors; credits: NASA/JPL-Caltech)167 visiteNel Mare Magnum delle ipotesi relative alle possibili origini di queste stranissime increspature della sabbia che giace sul fondo e sui fianchi dell'Endurance Crater ci sentiamo in dovere di aggiungere anche la nostra teoria alle tante esistenti: noi crediamo che le "dune" che si vedono non sono il risultato dell'azione di agenti esterni alla superficie di Marte (quali, ad esempio, dei curiosi "mulinelli d'aria" chiamati "dust devils"), bensì il prodotto di eventi sotterranei, forse di origine magnetica.
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OPP-SOL358-1P159971557EFF40FWP2372L7M1.jpg"Side-Winders" from Sol 358 (1)74 visiteDal Sol 358 del Rover Opportunity, ci arrivano queste immagini dell'orizzonte di Meridiani Planum e delle sue incredibili dune che noi abbiamo battezzato "Side-Winders" (espressione difficilmente traducibile - lett. "lato del vento" - la quale sta a significare un "movimento ondeggiante e sinuoso", proprio come quello che vediamo caratterizzare le forme delle dunette che circondano Opportunity).
Questa immagine è stata ripresa con il "filtro 7".
Inutile dire che sull'origine di queste formazioni sabbiose stiamo ancora brancolando nel buio...
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