| Risultati della ricerca nelle immagini - "Formation" |
Clouds-PIA14965-PCF-LXTT.jpgClouds over Charlier Crater (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)134 visiteOrbit Number: 43473
Latitude: 68,057° South
Longitude: 190,213° East
Instrument: VIS
Captured: October, 2nd, 2011
Mars Local Time (M.L.T.): 19:45 (Early Evening Hours)
MareKromium
|
|
Craters-Unnamed_Crater-Arabia_Terra-PCF-LXTT.jpgDelta Formation in Arabia Terra (Saturated Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)56 visitenessun commentoMareKromium
|
|
ESP_017405_2270_RED_abrowse.jpgNorthern Hemisphere Gullies on West-Facing Crater Slope (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)164 visiteThis image shows the Eastern (West-facing) side of an Unnamed Impact Crater in the Mid-Latitudes of the Northern Hemisphere.
Like many Mid-Latitude Craters, this one has Gullies along its Walls that are composed of Alcoves, Channels and Debris Aprons. The origins of these Gullies have been the subject of much debate; they could have formed by flowing water, liquid Carbon Dioxide, or dry granular flows. The orientation of these Gullies is of interest because many Craters only contain Gullies on certain Walls, such as those that are Pole-facing. This could be due to changes in orbital conditions and differences in solar heating along specific Walls.
Many of the other features observed in and around this Crater however are indicative of an ice-rich terrain, which may lend credence to the water formation hypothesis, at least for the Gullies visible here. The most notable of these features is the "Scalloped Terrain" in and around the Crater.
This type of Terrain has been interpreted as a sign of surface caving, perhaps due to sublimation of underlying ice.
Another sign of ice is the presence of parallel lineations and pitted material on the Floor of the Crater, similar to what is referred to as concentric Crater Fill. Parallel linear cracks are also observed along the Crater Wall over the Gullies, which could be due to thermal contraction of ice-rich material.
All of these features taken together are evidence for ice-rich material having been deposited in this Region during different climatic conditions that has subsequently begun to melt and/or sublimate under current conditions. More recently, Aeolian Deposits have accumulated around the Crater as evidenced by the parallel ridges dominating the landscape.
Dust Devil Streaks are also visible crossing the Aeolian Ridges.
Written by: Dan BermanMareKromium
|
|
ESP_022195_1335_RED_abrowse-Slope_Linea-PCF-LXTT-2.jpgTransient "Slope Linea Formation" in a well-preserved Unnameed Southern Crater (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)215 visiteAcquisition date: 21 April 2011
Mars Local Time (M.L.T.): 14:48 (Early Afternoon)
Latitude (centered): 45,9° North
Longitude (East): 9,5°
Range to Target Site (Spacecraft Altitude): 250,9 Km (156,8 miles)
Original Image Scale Range: 25,1 cm/pixel (with 1 x 1 binning) so objects ~75 cm across are resolved
Map Projected Scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 2,0°
Sun-Crater-Spacecraft Angle (Phase Angle): 37,9°
Solar Incidence Angle (S.AI.A.): 40° (with the Sun about 50° above the Local Horizon)
Solar Longitude: 278,5° (Northern Winter)
MareKromium
|
|
Mammatus-02.jpgClouds of Time (Natural Colors - Credits: Dr Paolo C. Fienga/LXTT/IPF)15158 visite"...Mihi, quanto plura recentium seu veterum revolvo, tanto magis ludibria rerum mortalium cunctis in negotiis obversantur..."
(Tacito)
"...(e) Quanto più le memorie antiche e recenti io scruto, tanto più mi fanno sorridere gli umani eventi..." (trad. libera)MareKromium
|
|
SOL040-041-GIF-Movie-MF3.gifDo You See?!? - Sol 41 (the GIF-Movie frame-by-frame; credits: Dr M. Faccin)76 visitenessun commentoMareKromium
|
|
|
|
| 6 immagini su 1 pagina(e) |
|
