| Piú votate - Mars Reconnaissance Orbiter (MRO) |
PSP_005609_1470_RED_abrowse-02.jpgInside Hale Crater (EDM n.2 - processing by: Dr M. Faccin; Natural Color credits: Lunexit)55 visitenessun commentoMareKromium
(8 voti)
|
|
ESP_014330_1960_RED_abrowse.jpgIsland-like Features on the Floor of Grjota Valles (Natural Colors; credits: Lunexit)56 visitenessun commentoMareKromium
(8 voti)
|
|
ESP_014404_1275-GB-LXT-04.jpgExtremely Unusual Surface Feature in Argyre Planitia (Natural Colors - SuperEDM n.3 - credits: Dr G. Barca & Lunexit)58 visiteA nostro parere, grazie a quest'ultimo EDM (ottenuto dal nostro grande Amico e Partner, Dr G. Barca), la natura della Surface Feature può essere accertata con un elevatissimo margine di sicurezza: si tratta della traccia di un impatto (sui generis).
Un impatto recentissimo, il quale ha visto la disintegrazione (probabilmente l'esplosione) del bolide negli immediati pressi del suolo (il che significa, in altre parole, che l'impatto, si, c'è stato, ma solo fra i detriti derivati dall'esplosione - con traccia della fiammata al suolo - ma SENZA una collisione vera e propria tra il bolide - che doveva essere piccolo e leggero - e la superficie).
Secondo noi, il "mistero" è risolto. Ma se Voi aveste opinioni in merito...scrivete!MareKromium
(8 voti)
|
|
ESP_014344_2195_RED_abrowse.jpgFeatures of Galaxias Fossae (Natural Colors; credits: Lunexit)56 visitenessun commentoMareKromium
(8 voti)
|
|
ESP_014083_0945_RED_abrowse-02.jpgActive Geyser on Mars: the "Mouth" (Natural Colors; credits: Dr M. Faccin & Lunexit)56 visitenessun commentoMareKromium
(8 voti)
|
|
PSP_010412_2475_RED_abrowse.jpgUnnamed Crater with DD Tracks (Natural Colors; credits: Lunar Explorer Italia)56 visitenessun commentoMareKromium
(8 voti)
|
|
Psp_010434_1575_red.jpgFan at Valley Mouth (possible True Colors; credits: Lunar Explorer Italia)59 visiteThis image shows the intersection of a Valley with the floor of a large Impact Crater. The Valley appears to have transported sediment that was deposited on the Crater Floor when the flow slowed. As the Eastern side of the lobate deposit appears to have been sheared off, it is possible that continuing flow from the valley eroded into its own deposits.
The deposit is noticeably different in color from the crater floor, indicating that the Valley transported different sediments. Since the large crater is shallow, likely due to infilling, this suggests that multiple sources of sediment and perhaps multiple deposition processes have affected the geology at this site.
The deposited material in the lobe at the Valley Mouth displays some interesting textural features. Small boulders are commonly present on its surface. This may demonstrate relatively energetic deposition as in a flash flood, although it is possible that the boulders are superimposed debris from later impact craters.
The Southern End of the deposit is also fracturing into blocks or slabs. These could be relics of old mud cracks, or of thermal contraction cracks formed in Permafrost.
§§§
Mars Local Time: 15:42 (middle afternoon)
Coord. (centered): 22,4° South Lat. and 336,3° East Long.
Spacecraft altitude: 259,3 Km (such as about 162,1 miles)
Original image scale range: 25,9 cm/pixel (with 1 x 1 binning) so objects ~78 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 2,6°
Phase Angle: 68,2°
Solar Incidence Angle: 66° (meaning that the Sun is about 24° above the Local Horizon)
Solar Longitude: 143,2° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
(8 voti)
|
|
Psp_009352_1770_red.jpgLight Toned Materials and Plains in Southern Meridiani Planum (Extremely Enhanced Natural Colors; credits: Lunexit)56 visitenessun commentoMareKromium
(8 voti)
|
|
PSP_006952_1870_RED_abrowse-00~0.jpgDunefield in West Arabia Terra Unnamed Crater (context frame; MULTISPECTRUM - credits: Lunexit)71 visiteThis image shows dunes in an unnamed crater in the West Arabia Terra region.
The rim of the crater lies to the South of the image (Sx) and a dark, toned field of barchan sand dunes rests on the crater floor in the Northern portion of the observation (Dx). MareKromium
(8 voti)
|
|
PSP_008311_1835_RED_abrowse-00.jpgFeatures and Mineralogy of Aram Chaos (context-frame - MULTISPECTRUM; credits: Lunexit)109 visiteThis image is from Aram Chaos, a large crater connected to the Ares Vallis Outflow Channel. It is called “chaos” because of the rough floor topography, large slumped blocks and large fractures that may have been caused by removal of subsurface material.MareKromium
(8 voti)
|
|
PSP_001474_2520_RED-new_lake-00~0.jpgThe Northern Lakes: Lake "Lunexit" (context image; MULTISPECTRUM - Credits: Lunexit)66 visitenessun commentoMareKromium
(8 voti)
|
|
PSP_005194_1070_RED_browse.jpgFaulting in the South Polar Layered Deposits54 visiteThe scarp shown in this image marks the edge of the Polar Layered Deposits. These layered deposits are a mixture of dust and water-ice. Each layer is thought to record information about the state of the Martian climate at the time of its deposition.
The polar layered deposits were once more extensive, but have been eroded back to their current size. Most of this erosion takes places at inclined scarps (such as this one) which retreat as icy material is ablated away.
Other processes are also operating on these deposits as exemplified by the fault that is visible on the left of the image. Layers appear offset from one side of the fault to another indicating that the layered deposits have been fractured into large blocks that have moved relative to each other. The source of the stress that caused this fracturing is unknown; some possible examples are subsidence of the underlying terrain or perhaps melting of a portion of the base of the ice-sheet.
This particular Region of the Layered Deposits (Ultimi Lingula) contains many examples of this brittle fracture (which is otherwise rare in these Deposits). Another less obvious fault lies near the center of the image at the base of the scarp. This fault does not break through, or even deform, the upper layers which may indicate that the fault occurred when only half the layered deposits had accumulated. These observations point to a history of faulting in this region that at least spans the age range of these Layered Deposits. MareKromium
(8 voti)
|
|
| 2235 immagini su 187 pagina(e) |
 |
3 | |
|
|
|
|
|
|
|
|
