| |
Mars Reconnaissance Orbiter (MRO)
|
|
|
Psp_009855_2625_red.jpgUnusually-looking "Mound" in the NPLD (natural colors; credits: Lunexit)65 visiteThe North Polar Layered Deposits (NPLD) are composed of a stack of ice-rich layers that is up to several kilometers thick. Each layer is thought to contain information about the climate that existed when it was deposited, so the stack of layers within the NPLD may represent a record of how climate has varied on Mars in the recent past.
We can see these internal layers exposed in the many troughs and scarps that have been cut by erosion into the stack. One of these troughs, visible in this image, contains a 500 meter (1640 feet) thick section of this layering.
However, the layers are not the only interesting thing being shown here. There is a conical mound part-way down the slope that is approximately 40 m (130 ft) high. One possible explanation for this anomaly is that it may be the remnant of a buried impact crater that is now being exhumed. As the NPLD accumulated, impacts occurred throughout its surface which were then buried by additional ice. These buried craters are generally inaccessible to us, but in a few rare locations, erosion that forms a trough (like this one) can uncover these buried structures. For reasons that are poorly understood right now, the ice beneath the site of the crater is more resistant to this erosion, so when material is removed in forming the trough the ice beneath the old impact site remains, creating this isolated hill.
An inspection of the full-resolution data shows that polygonal blocks, up to 10 mt (33 feet) across, make up this mound. Although covered with reddish dust, the blocks resemble ice-rich blocks seen in other exposures of the NPLD.MareKromium
|
|
Psp_009820_1510_red.jpgOutcrops in Eridania Basin (possible True Colors; credits: Lunar Explorer Italia)85 visiteMars Local Time: 15:37 (middle afternoon)
Coord. (centered): 28,7 South Lat. and 180,0 East Long.
Spacecraft altitude: 254,2 Km (such as about 158,9 miles)
Original image scale range: 50,9 cm/pixel (with 1 x 1 binning) so objects ~1,53 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,3
Phase Angle: 72,7
Solar Incidence Angle: 73 (meaning that the Sun is about 17 above the Local Horizon)
Solar Longitude: 120,1 (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
|
|
Psp_009802_1700_red.jpgGanges Cavus' Walls and Interior (possible True Colors; credits: Lunar Explorer Italia)65 visiteMars Local Time: 15:30 (middle afternoon)
Coord. (centered): 9,9 South Lat. and 308,4 East Long.
Spacecraft altitude: 264,1 Km (such as about 165,1 miles)
Original image scale range: 26,4 cm/pixel (with 1 x 1 binning) so objects ~52,8 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 8,3
Phase Angle: 67,2
Solar Incidence Angle: 61 (meaning that the Sun is about 29 above the Local Horizon)
Solar Longitude: 119,4 (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
|
|
Psp_009799_2205_red.jpgFeatures of Deuteronilus Mensae (natural colors; credits: Lunexit)70 visiteThis image shows Lineated Valley Fill and Lobate Debris Aprons in the Deuteronilus Mensae Region. Deuteronilus Mensae is located on the northern edge of Arabia Terra and borders the high-standing, heavily-cratered Southern Hemisphere and the low, uncratered plains that cover most of the Northern Hemisphere of Mars.
The Region is characterized by Hills and Mesas surrounded by debris Slopes and broad Valleys.
Many of the valley floors in the Deuteronilus Mensae Region exhibit complex alignments of small Ridges and Pits often called Lineated Valley Fill.
The cause of the small-scale texture is not well understood, but may result from patterns in ice-rich soils or ice loss due to sublimation (ice changing into water vapor).
The linear alignment may be caused by downhill movement of ice-rich soil or by glacial flow.
For example, flowing ice on Earth typically develops wrinkles or ridges and pits due to stresses in the ice as it moves.
The result is flow patterns, called stream lines that follow the valleys and curve around obstacles. In this image, stream lines are diverted or curve around the Mesas.
The mesas in this image are also surrounded by aprons of debris that appear to have flowed away from the Mesa. Recent results from the SHAllow RADar (SHARAD) instrument, another instrument onboard the Mars Reconnaissance Orbiter, indicate that lobate debris aprons in Deuteronilus Mensae, similar to those visible here, are composed of material dominated by ice [Plaut et al., 2008] and are interpreted to be potential debris-covered glaciers or rock glaciers.
The Debris Aprons in this image appear to lie on top of the Lineated Valley Fill and are therefore probably younger deposits.MareKromium
|
|
Psp_009797_1525_red.jpgThe Central Peak of Isil Crater (possible True Colors; credits: Lunar Explorer Italia)63 visiteMars Local Time: 15:37 (middle afternoon)
Coord. (centered): 27,0 South Lat. and 87,9 East Long.
Spacecraft altitude: 254,5 Km (such as about 159,1 miles)
Original image scale range: 50,9 cm/pixel (with 1 x 1 binning) so objects ~1,53 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 1,6
Phase Angle: 70,8
Solar Incidence Angle: 72 (meaning that the Sun is about 18 above the Local Horizon)
Solar Longitude: 119,2 (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
|
|
Psp_009794_1875_red.jpgRelatively Fresh (and Rayed) Crater, Windstreaks and Fissure in Cerberus Fossae (Saturated Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunar Explorer Italia)66 visiteMars Local Time: 15:29 (early afternoon)
Coord. (centered): 7,4 North Lat. and 165,3 East Long.
Spacecraft altitude: 274,7 Km (such as about 171,7 miles)
Original image scale range: 27,5 cm/pixel (with 1 x 1 binning) so objects ~82 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,1
Phase Angle: 52,4
Solar Incidence Angle: 52 (meaning that the Sun is about 38 above the Local Horizon)
Solar Longitude: 119,1 (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
|
|
Psp_009772_1545_red.jpgSchaeberle Crater (possible True Colors; credits: Lunar Explorer Italia)64 visiteMars Local Time: 15:35 (middle afternoon)
Coord. (centered): 25,4 South Lat. and 50,0 East Long.
Spacecraft altitude: 254,6 Km (such as about 159,1 miles)
Original image scale range: 50,9 cm/pixel (with 1 x 1 binning) so objects ~1,53 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,9
Phase Angle: 71,4
Solar Incidence Angle: 71 (meaning that the Sun is about 19 above the Local Horizon)
Solar Longitude: 118,3 (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
|
|
Psp_009758_2030_red.jpgExtremely Unusually-looking Northern Dunefield (possible True Colors; credits: Lunar Explorer Italia)68 visiteMars Local Time: 15:24 (early afternoon)
Coord. (centered): 22,7 North Lat. and 65,8 East Long.
Spacecraft altitude: 282,4 Km (such as about 176,5 miles)
Original image scale range: 28,3 cm/pixel (with 1 x 1 binning) so objects ~56,5 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 4,8
Phase Angle: 51,5
Solar Incidence Angle: 47 (meaning that the Sun is about 43 above the Local Horizon)
Solar Longitude: 117,8 (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
|
|
Psp_009757_2675_red.jpgHigh-Latitude Exposure of North Polar Layered Deposits (possible True Colors; credits: Lunar Explorer Italia)71 visiteMars Local Time: 14:41 (early afternoon)
Coord. (centered): 87,3 North Lat. and 77,4 East Long.
Spacecraft altitude: 342,6 Km (such as about 214,1 miles)
Original image scale range: 68,5 cm/pixel (with 1 x 1 binning) so objects ~2,06 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 23,8
Phase Angle: 47,9
Solar Incidence Angle: 66 (meaning that the Sun is about 24 above the Local Horizon)
Solar Longitude: 117,8 (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
|
|
Psp_009754_1450_red-PCF-LXTT.jpgFeatures of Atlantis Chaos (Absolute Natural Colors; credits for the additional process. and color: Dr Paolo C. Fienga - Lunexit Team)285 visiteMars Local Time: 15:37 (middle afternoon)
Coord. (centered): 34,6 South Lat. and 182,7 East Long.
Spacecraft altitude: 253,7 Km (such as about 158,6 miles)
Original image scale range: 50,8 cm/pixel (with 1 x 1 binning) so objects ~1,52 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,3
Phase Angle: 76,9
Solar Incidence Angle: 77 (meaning that the Sun is about 13 above the Local Horizon)
Solar Longitude: 117,7 (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
|
|
Psp_009743_2565_red.jpgNorthern Dunes (possible True Colors; credits: Lunar Explorer Italia)69 visiteMars Local Time: 14:20 (early afternoon)
Coord. (centered): 76,2 North Lat. and 95,3 East Long.
Spacecraft altitude: 330,1 Km (such as about 206,3 miles)
Original image scale range: 33 cm/pixel (with 1 x 1 binning) so objects ~99 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 17,0
Phase Angle: 71,6
Solar Incidence Angle: 57 (meaning that the Sun is about 33 above the Local Horizon)
Solar Longitude: 117,3 (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
|
|
Psp_009731_2165_red.jpgPeriglacial Modification of a Fairly Fresh Crater in Utopia Planitia (possible True Colors; credits: Lunar Explorer Italia)52 visiteMars Local Time: 15:19 (early afternoon)
Coord. (centered): 36,0 North Lat. and 80,7 East Long.
Spacecraft altitude: 295,3 Km (such as about 184,6 miles)
Original image scale range: 29,5 cm/pixel (with 1 x 1 binning) so objects ~89 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 8,4
Phase Angle: 53,4
Solar Incidence Angle: 45 (meaning that the Sun is about 45 above the Local Horizon)
Solar Longitude: 116,8 (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
|
|
| 2237 immagini su 187 pagina(e) |
|
|
|
|
|
11 | |
|
|
|
|
|
|
