| Piú votate - Mars Reconnaissance Orbiter (MRO) |
Psp_009593_1365_red.jpgGeometry of Ramparts for Crater in Middle Southern Latitudes (possible True Colors; credits: Lunar Explorer Italia)57 visiteMars Local Time: 15:35 (middle afternoon)
Coord. (centered): 43,4° South Lat. and 258,9° East Long.
Spacecraft altitude: 251,3 Km (such as about 157,0 miles)
Original image scale range: 50,3 cm/pixel (with 1 x 1 binning) so objects ~1,51 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 8,3°
Phase Angle: 88,9°
Solar Incidence Angle: 83° (meaning that the Sun is about 7° above the Local Horizon)
Solar Longitude: 111,9° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
(5 voti)
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PSP_010281_1510_RED_abrowse-01.jpgSedimentary Layers in Columbus Crater (edm - possible True Colors; credits: Lunar Explorer Italia)57 visiteVisible in this edm is a north-facing slope (roughly 250 meters, or 800 feet, across) exposing finely layered sedimentary rock.
In this possibly true-color view, layers with a dark silver-gray appearance may be intrinsically darker, or may have a texture that more effectively collects dark sand particles, than adjacent layers with a brighter appearance.MareKromium
(5 voti)
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PSP_006528_1120_RED_abrowse-00~0.jpgSources of Basaltic Sand (context frame; MULTISPECTRUM - credits: Lunexit)56 visiteSand dunes are among the most prominent wind-formed features found on Mars. Their morphologies depend on the winds and also on the local supply of sand grains, so they provide clues to the nature of both the Martian Atmosphere and Surface.
Dunes form through the accumulation of coarse sand grains carried by the wind by means of saltation, or bouncing along the surface. Monitoring the present day dune activity can help determine the timescale over which Martian rocks are eroded, as the impacting grains sandblast the surface over time. The sands of Mars must be continually replenished as the coarse grains are ground into fine dust by repeated impacts. Finding the hidden sources of fresh sand is a challenge for HiRISE.MareKromium
(5 voti)
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Psp_009531_2155_red.jpgPits near Galaxias Region (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunar Explorer Italia)59 visiteMars Local Time: 15:21 (early afternoon)
Coord. (centered): 35,2° North Lat. and 142,2° East Long.
Spacecraft altitude: 296,1 Km (such as about 185,1 miles)
Original image scale range: 59,3 cm/pixel (with 1 x 1 binning) so objects ~1,78 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 2,3°
Phase Angle: 42,6°
Solar Incidence Angle: 45° (meaning that the Sun is about 45° above the Local Horizon)
Solar Longitude: 109,7° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
(5 voti)
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Psp_009544_2160_red.jpgCratered Cones in Galaxias Colles (Saturated Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunar Explorer Italia)56 visiteMars Local Time: 15:20 (early afternoon)
Coord. (centered): 35,7° North Lat. and 147,0° East Long.
Spacecraft altitude: 295,9 Km (such as about 185,0 miles)
Original image scale range: 29,6 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: 0,8°
Phase Angle: 44,1°
Solar Incidence Angle: 45° (meaning that the Sun is about 45° above the Local Horizon)
Solar Longitude: 110,1° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
(5 voti)
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Psp_009510_1825_red.jpgUnnamed Crater with Deposits in Meridiani Planum (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunar Explorer Italia)56 visiteMars Local Time: 15:28 (early afternoon)
Coord. (centered): 2,4° North Lat. and 359,9° West Long.
Spacecraft altitude: 272,1 Km (such as about 170,1 miles)
Original image scale range: 27,2 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: 4,1°
Phase Angle: 51,3°
Solar Incidence Angle: 55° (meaning that the Sun is about 35° above the Local Horizon)
Solar Longitude: 108,9° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
(5 voti)
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Psp_009529_2260_red.jpgSmall Mound in Arcadia Planitia (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunar Explorer Italia)58 visiteMars Local Time: 15:17 (early afternoon)
Coord. (centered): 45,8° North Lat. and 194,9° East Long.
Spacecraft altitude: 303,0 Km (such as about 189,4 miles)
Original image scale range: 60,6 cm/pixel (with 1 x 1 binning) so objects ~1,82 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,5°
Phase Angle: 44,9°
Solar Incidence Angle: 45° (meaning that the Sun is about 45° above the Local Horizon)
Solar Longitude: 109,6° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
(5 voti)
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Psp_009513_1810_red.jpgEchus Chasma (Enxtrelmely Enhanced Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunar Explorer Italia)59 visiteMars Local Time: 15:28 (early afternoon)
Coord. (centered): 1,1° North Lat. and 278,0° East Long.
Spacecraft altitude: 266,2 Km (such as about 166,4 miles)
Original image scale range: 53,3 cm/pixel (with 1 x 1 binning) so objects ~1,60 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 2,8°
Phase Angle: 53,0°
Solar Incidence Angle: 55° (meaning that the Sun is about 35° above the Local Horizon)
Solar Longitude: 109,0° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
(5 voti)
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Psp_009453_2500_red.jpgThe Southern Rim of Louth Crater (possible True Colors; credits: Lunar Explorer Italia)57 visiteMars Local Time: 14:57 (early afternoon)
Coord. (centered): 69,9° North Lat. and 103,3° East Long.
Spacecraft altitude: 313,8 Km (such as about 196,1 miles)
Original image scale range: 62,8 cm/pixel (with 1 x 1 binning) so objects ~1,88 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,5°
Phase Angle: 53,1°
Solar Incidence Angle: 53° (meaning that the Sun is about 37° above the Local Horizon)
Solar Longitude: 106,9° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
(5 voti)
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Psp_009408_2640_red.jpgMass Wasting on the North Polar Scarp (possible True Colors; credits: Lunar Explorer Italia)163 visiteMars Local Time: 13:34 (early afternoon)
Coord. (centered): 84,0° North Lat. and 230,1° East Long.
Spacecraft altitude: 316,9 Km (such as about 198,0 miles)
Original image scale range: 31,7 cm/pixel (with 1 x 1 binning) so objects ~95 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,8°
Phase Angle: 61,0°
Solar Incidence Angle: 60° (meaning that the Sun is about 30° above the Local Horizon)
Solar Longitude: 105,3° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
(5 voti)
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PSP_005514_1360_RED_abrowse~0.jpgDunefield inside Rabe Crater (False Colors - elab. Lunexit)58 visiteThis image shows part of the floor of Rabe Crater, a large (about 108 Km, or approx. 67 miles in diameter) impact crater in the Southern Highlands.
Dark dunes — accumulations of wind blown sand — cover part of crater's floor and contrast with the surrounding bright-colored outcrops. The extreme close-up view reveals a thumbprint-like texture of smaller ridges and troughs covering the surfaces of the larger dunes.
These smaller ripples are also formed and shaped by blowing wind in the thin atmosphere of Mars.
One puzzling question is why the dunes are dark compared with the relative bright layered material contained within the Crater.
The probable answer is that the source of the dark sand is not local to this Crater; rather, this topographic depression has acted as a sand trap that has collected material being transported by winds blowing across the plains outside the Crater. MareKromium
(5 voti)
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PSP_004078_2015_RED_browse-01.jpgLayered Rocks within Becquerel Crater (enhanced natural colors; credits: Lunar Explorer Italia)60 visiteRhythmic bedding in sedimentary bedrock within Becquerel Crater on Mars is suggested by the patterns in this image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter.
Three dimensional analysis based on stereo pairs of images confirmed the regularity of repetition in the thickness of the beds. In the left half of this image, some of the rhythm is apparent as a series of bundles of about 10 individual layers per bundle. By corresponding to a known 10-to-one pattern in changes in the tilt of Mars' Rotation Axis, this pattern suggests the periodicity in the rock layers results from cyclical changes in the Planet's tilt.
This view covers an area about 1150 meters (0,7 miles) wide. Individual layers in the scence average 3,6 meters (12 feet) thick. The view is presented in enhanced natural colors emphasizing the differing compositions of surface material. Sand trapped in relative low points in the terrain appears grey-blueish. Sedimentary rocks appear brown.
Faulting apparent in the image suggests that the deposits are hardened rock, not softer material. Tilting of the layers in different ways and the surface topography made the three-dimensional analysis necessary for determining the thickness of layers.
This image is a portion of the HiRISE image catalogued as PSP_004078_2015, taken on June 10, 2007.
The location of the imaged area is at 22° North Latitude, 352° East Longitude, within the Arabia Terra Region.MareKromium
(5 voti)
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