| Piú votate - Mars Reconnaissance Orbiter (MRO) |
ESP_025399_2535-PCF-LXTT.jpgSpring on the Edge of the North Polar Erg (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)128 visiteMars Local Time: 14:14 (early afternoon)
Coord. (centered): 73,3° North Lat. and 355,1° East Long.
Spacecraft altitude: 317,5 Km (such as about 198,5 miles)
Original image scale range: 31,8 cm/pixel (with 1 x 1 binning) so objects ~ 95 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: POLAR STEREOGRAPHIC
Emission Angle: 2,1°
Sun - Mars - MRO (or "Phase") Angle: 59,4°
Solar Incidence Angle: 58° (meaning that the Sun is about 32° above the Local Horizon)
Solar Longitude: 49,0° (Northern Spring)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
(6 voti)
|
|
ESP_025118_2570_RED-PCF-LXTT-00C.jpgDefrosting Northern Dunes (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)88 visiteMars Local Time: 13:58 (early afternoon)
Coord. (centered): 76,6° North Lat. and 104,1° East Long.
Spacecraft altitude: 317,7 Km (such as about 198,6 miles)
Original image scale range: 31,8 cm/pixel (with 1 x 1 binning) so objects ~ 95,0 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: POLAR STEREOGRAPHIC
Emission Angle: 0,8°
Sun - Mars - MRO (or "Phase") Angle: 63,5°
Solar Incidence Angle: 63° (meaning that the Sun is about 27° above the Local Horizon)
Solar Longitude: 39,2° (Northern Spring)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
(6 voti)
|
|
ESP_021899_1095_RED_abrowse-01-PCF-LXTT.jpgDD Tracks on a Southern Dunefield (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 796 visitenessun commentoMareKromium
(6 voti)
|
|
ESP_021942_1520_abrowse-PCF-LXTT.jpgGully-like Feature inside Terby Crater (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)299 visitenessun commentoMareKromium
(6 voti)
|
|
ESP_016036_1370_RED_abrowse-02-PCF-LXTT.jpgDunes in Noachis Terra (EDM n.2 - Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)231 visitenessun commentoMareKromium
(6 voti)
|
|
Psp_001700_2505_red-00~0.jpgLauth Crater and the Frozen "Pseudo-Lake" of Vastitas Borealis (CTX Frame - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)306 visiteThe right side of PSP_001700_2505 shows a portion of a Frost Patch on a Mound inside a Northern Hemisphere Crater (unofficially known as "Lauth Crater").
The Frost Patch has remained largely stable at least since the Viking era (late 1970s). The bright Frost Region is bounded by a Dunefield on the North-East. Several sizes of Dunes are visible. The size classes probably represent generations of Dunes that formed under a variety of dominant wind conditions. MareKromium
(6 voti)
|
|
PSP_004072_1845_RED_abrowse-00.jpgThe "End" of Lethe Vallis (CTX Frame - Enhanced Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)102 visiteHiRISE image PSP_004072_1845 shows the funnel-shaped Terminus of Lethe Vallis, a winding Channel in the Elysium Planitia Region of Mars.
Lethe Vallis flows from South-West to North-East between 2 basins: Cerberus Palus and Eastern Elysium Plantia. Where it empties into the latter, the Channel abruptly widens (see the EDM n.1).
On the West side (up) of this HiRISE image, Lethe Vallis is approx. 800 mt wide; on the East side (down), it is more than 7 Km in width. As the fluid that carved the Channel spread out, its erosive power diminished. Thus, where the Channel is wider, it contains numerous high-standing Mesas that are primarily composed of pre-existing material that was not fully eroded away.
The Floor of Lethe Vallis is covered in solidified Lava and blanketed by a thin layer of light-toned Dust. The Lava has a rough, ridged appearance where its surface buckled as it cooled, and a smoother polygonal texture where it was not significantly deformed. Interestingly, Lava textures are visible high on the Banks and Terraces of the Lethe Vallis. Farther away from the Channel, the Terrain is older and more heavily cratered.MareKromium
(6 voti)
|
|
PSP_004072_1845_RED_abrowse-01.jpgThe "End" of Lethe Vallis (EDM n.1 - Enhanced Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)106 visitenessun commentoMareKromium
(6 voti)
|
|
PSP_003695_1250_RED_abrowse-00.jpgUnnamed Southern Crater with Large Dunefield and DD Streaks (CTX Frame - Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)60 visitePSP_003695_1250 shows a Southern Hemisphere crater with gullies, dunes, periglacial modification, bright rock deposits and Dust Devil Tracks.
Although these features are all common on Mars, there are not many places that have all of them together as viewed here.
The gullies seen at the top of the image are likely caused by wet debris flows. They have deposits of multiple ages. The gully on the left has bright deposits that have been modified by periglacial processes overlain by slightly darker deposits that have not been modified. Periglacial processes, such as seasonal freezing and thawing, are responsible for the polygonal fractures seen near the gullies and around the image.
The dark material in the center of the image is a dune field.
There are several different sizes and orientations of dunes — these different orientations indicate that the dominant winds in the area have changed throughout time.
The dark streaks that criss-cross on the outskirts of the dune field are DDT.
DDs are spinning cells of dust that travel across the Martian Surface. As they move, they pick up and redeposit particles, as well as disturbing dust on the surface.
They are responsible elsewhere on Mars for removing dust from the solar panels of the Mars Exploration Rovers Spirit and Opportunity, which has helped to extend their missions way beyond the 90-day primary mission.
Note that the black rectangular feature near the top right of the image is a data gap resulting from data transmission problems; it is not a real feature. MareKromium
(6 voti)
|
|
PSP_009342_1725_RED_abrowse-08.jpgWorm-like Indigenous Lifeform? (Enhanced Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 427 visitenessun commentoMareKromium
(6 voti)
|
|
PSP_009342_1725_RED_abrowse-09.jpgWorm-like Indigenous Lifeform? (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 218 visitenessun commentoMareKromium
(6 voti)
|
|
PSP_002922_1725_RED_abrowse-03.jpgPossible Volcanic "Mouth", on Arsia Mons' Flank (EDM - Natural Colors - credits for the additional process.: Dr Paolo C. Fienga)92 visitenessun commentoMareKromium
(6 voti)
|
|
| 2234 immagini su 187 pagina(e) |
 |
|
|
|
|
8 | |
|
|
|
|
