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Risultati della ricerca nelle immagini - "Color" |
030-OPP-SOL269-1N152063405EFF37B5P1910L0M1.jpgClouds over Endurance (in the early morning)144 visiteUna nota (è proprio il caso di dirlo...) di "colore": abbiamo già ricevuto commenti che esprimono dubbi sull'accuratezza del nostro programma di "colorazione" dei frames e svariati Lettori si domandano il motivo per cui il cielo di Marte lo "coloriamo" di rosa, arancio, rosso e non di blu. Allora, cerchiamo di darVi due risposte molto semplici e definitive:
1) il programma in questione è un gioco: funziona (e cioè "colora") solo una volta date determinate premesse. Cambiate le premesse, cambiano i colori e nessuno sa - oggi come oggi - se le nostre premesse (come quelle della NASA o di qualsiasi altro) sono effettivamente accurate o no;
2) non abbiamo elementi, a parte il Rayleigh Scattering (che, ribadiamo, non è detto che su Marte conduca ai medesimi risultati che vediamo sulla Terra), i quali supportino l'ipotesi di "Cieli Azzurri su Marte". Al limite, come già ipotizzato in passato, potremmo supporre e sostanziare l'idea di cieli rosati al mattino, celeste chiarissimo nelle ore del mezzogiorno e del primo pomeriggio, per poi arrivare ad un rapido abbattimento della luminosità dalla metà del pomeriggio, con cielo di colore azzurro/blu molto scuro all'orizzonte e nero dai 45/50° e sino allo Zenith.
Al tramonto, ipotizziamo - al contrario di quello che fa la NASA - una colorazione rosso/arancio intensa nei pressi dell'area in cui il Sole cala mentre il resto del cielo dovrebbe rimanere color azzurro tenebra.
Se le polveri in sospensione fossero effettivamente presenti in grandi quatitativi, allora potremmo anche ipotizzare la permanenza di una luminosità arancio/rosa diffusa - ma solo nei pressi dell'area in cui il Sole è tramontato - per alcune ore dopo il tramonto. Per il resto, cielo molto scuro con già visibili una moltitudine di stelle, anche di medio/minima magnitudine.
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088-SOL932-McMurdo_L257F-A814R1_cbr2-00.jpgMc Murdo Panorama (1)77 visiteCaption NASA originale:"This beautiful scene reveals a tremendous amount of detail in Spirit's surroundings. Many dark, porous-textured volcanic rocks can be seen around the Rover, including many on Low Ridge. Two rocks to the right of center, brighter and smoother-looking in this image and more reflective in infrared observations by Spirit's Miniature Thermal Emission Spectrometer, are thought to be meteorites. On the right, "Husband Hill" on the horizon, the rippled El Dorado sand dune field near the base of that hill and lighter-toned Home Plate below the dunes provide context for Spirit's travels since mid-2005. Left of center, tracks and a trench dug by Spirit's right-front wheel, which no longer rotates, have exposed bright underlying material. This bright material is evidence of sulfur-rich salty minerals in the subsurface, which may provide clues about the watery past of this part of Gusev Crater".
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088-SOL932-McMurdo_L257F-A814R1_cbr2-01.jpgMc Murdo Panorama (2)64 visiteCaption NASA originale:"Spirit has stayed busy at Winter Haven during the past six months even without driving.
In addition to acquiring this spectacular panorama, the Rover Team has also acquired significant new assessments of the elemental chemistry and mineralogy of rocks and soil targets within reach of the rover's arm. The team plans soon to have Spirit drive to a very nearby spot on Low Ridge to access different rock and soil samples while maintaining a good solar panel tilt toward the Sun for the rest of the Martian Winter.
Despite the long span of time needed for acquiring this 360° view - a few images at a time every few Soles over a total of 119 Soles because the available power was so low -- the lighting and color remain remarkably uniform across the mosaic".
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088-SOL932-McMurdo_L257F-A814R1_cbr2-02.jpgMc Murdo Panorama (3)66 visiteCaption NASA originale:"This fact attests to the repeatability of Wintertime Soles on Mars in the Southern Hemisphere.
This is the time of year when Mars is farthest from the Sun, so there is much less Dust Storm and Dust Devil activity than at other times of the year".
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OPP-SOL901-PIA08753-001.jpgBeagle Crater and 360° Panorama from Sol 901 through 904 (1)53 visiteCaption NASA originale:"This 360° view shows one of Opportunity's last stops on the now-familiar surface of Meridiani Planum before reaching different terrains associated with the very large Victoria Crater. In the center of the mosaic - frames 7 to 11 - is Beagle Crater, an impact crater about 35 mt (115 feet) wide. On the far left and wrapping around to the far right, Opportunity's tracks are visible approaching the crater".
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OPP-SOL901-PIA08753-002.jpgBeagle Crater and 360° Panorama from Sol 901 through 904 (2)53 visiteCaption NASA originale:"Though it looks relatively fresh in orbital images, from a closer vantage point Beagle Crater appears moderately eroded.
The crater walls are slumped and the middle of the crater bowl is filled with rippled sand. However, a slightly raised crater rim remains, and in a few places (for instance, on the inside left wall), cliffs of outcrop appear to be preserved in the crater. Ejected rocks from Beagle Crater surround the Rover, many with the distinctive, fine-grained layering commonly seen in the rocks of Meridiani Planum. Many of these rocks have surfaces smoothed by wind erosion. Wind erosion also formed the sand drifts nestled among the rocks".
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OPP-SOL901-PIA08753-003.jpgBeagle Crater and 360° Panorama from Sol 901 through 904 (3)53 visiteCaption NASA originale:"Because impact craters have well-understood shapes when they form, the altered appearance of eroded craters gives scientists clues to the processes that modified them. By observing how filled an impact crater has become and how worn its edges are, scientists can estimate how long its surface has been exposed to erosion. The many-sided outline of a crater such as Beagle and the blocky appearance of its ejecta may also tell scientists about the strength of the underlying bedrock. Based on observations such as these, scientists know that Beagle Crater is fresher than Eagle and Fram craters near Opportunity's Landing Site and more similar in form to Viking and Voyager craters in the plains to the North of Beagle".
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OPP-SOL901-PIA08753-004.jpgBeagle Crater and 360° Panorama from Sol 901 through 904 (4)53 visiteCaption NASA originale:"Opportunity made other observations at Beagle Crater, such as spectroscopic measurements taken with the PanCam and the Miniature Thermal Emission Spectrometer, to help scientists assess the composition of the rocks and determine whether Beagle Crater was excavated into the surface rocks of Meridiani Planum or into the ejecta blanket of Victoria Crater".
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OPP-SOL901-PIA08753-005.jpgBeagle Crater and 360° Panorama from Sol 901 through 904 (5)56 visiteCaption NASA originale:"Beagle Crater takes its unofficial name from a great ship of exploration, the HMS Beagle, whose most famous passenger was British naturalist Charles Darwin. During the Beagle expedition around the world, Darwin conducted many of the observations that led to his theory of natural selection. Scientists have unofficially named many rocks and features in the area of Beagle Crater after the Galapagos Islands and the varieties of finches Darwin observed there. The name Beagle Crater also commemorates the ill-fated British lander, Beagle 2, reminding us how difficult space exploration can be".
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OPP-SOL901-PIA08753-006.jpgBeagle Crater and 360° Panorama from Sol 901 through 904 (6)53 visiteCaption NASA originale:"Opportunity took the mosaic of images that make up this 360-degree view of the Rover's surroundings with the Panoramic Camera (PanCam) on the Rover's 901st through 904th Soles, or Martian days (such as from Aug. 6 through Aug. 9, 2006), of exploration. This is an approximate true-color image combining exposures taken through the PanCam's 753-, 535- and 432-nanometer filters".
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OPP-SOL901-PIA08753-007.jpgBeagle Crater and 360° Panorama from Sol 901 through 904 (7)81 visitenessun commento
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OPP-SOL901-PIA08753-009.jpgBeagle Crater and 360° Panorama from Sol 901 through 904 (8)53 visitenessun commento
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