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ZZ-Mercury-Terminator-PIA10937-0.jpgNorthern Latitudes and a possible Orbital Anomaly (natural colors; credits: Lunexit)56 visiteAbout 91 minutes after MESSENGER’s closest pass by the Planet, MDIS acquired this image of Mercury’s Northern Surface, which is one in a set of 48 that form a mosaic of the departing Planet. In this image, the left portion of the Surface fades into darkness at the Terminator, the line between the sunlit dayside of the Planet and the dark night side.
The left-side portions of the surface that are just coming out of the darkness are being hit with the first rays of morning sunlight. Some of the surface to the right of this scene can be viewed in this previously released image looking toward Mercury’s North Pole (PIA10193).
Date Acquired: January 14, 2008
Image Mission Elapsed Time (MET): 108830334
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 0,8 Km/pixel (0,5 miles/pixel) Scale: The width of this image is about 800 Km (approx. 500 miles)
Spacecraft Altitude: about 30.700 Km (approx. 19.100 miles)MareKromium
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PHOE-SOL090-PIA11054-2.jpgIce Cold Sunrise on Mars - Sol 90 (natural colors; credits: Lunexit)56 visiteFrom the location of NASA's Phoenix Mars Lander, above the Martian Arctic Circle, the Sun does not set during the peak of the Martian Summer.
This period of maximum solar energy is past — on Sol 86, the 86th Martian Day after the Phoenix landing, the Sun fully set behind a slight rise to the North for about half an hour.
This red-filter image taken by the lander's Surface Stereo Imager, shows the Sun rising on the morning of Sol 90, Aug. 25, 2008, the last day of the Phoenix nominal mission.
The image was taken at 51 minutes past Midnight (Local Solar Time) during the slow sunrise that followed a 75 minute "night". The skylight in the image is light scattered off atmospheric dust particles and ice crystals.
The setting Sun does not mean the end of the Mission. In late July, the Phoenix Mission was extended through September, rather than the 90-Sol duration originally planned as the Prime Mission.MareKromium
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PHOE-SOL090-PIA11055.jpgVastitas' Surface, according to NASA - Sol 90 (natural colors; credits: NASA)56 visiteDuring the first 90 Martian Days, or Soles, after its May 25, 2008, landing on an Arctic Plain of Mars, NASA's Phoenix Mars Lander dug several trenches in the workspace reachable with the Lander's Robotic Arm (LRA).
The Lander's Surface Stereo Imager camera recorded this view of the workspace on Sol 90, early afternoon Local Mars time (overnight Aug. 25 to Aug. 26, 2008). The shadow of the the camera itself, atop its mast, is just left of the center of the image and roughly a third of a meter (one foot) wide.
The workspace is on the north side of the lander. The trench just to the right of center is called "Neverland".MareKromium
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OPP-SOL1094-1.jpgVictoria's Paving - Sol 1094 (True Colors; credits: Dr G. Barca)56 visitenessun commentoMareKromium
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OPP-SOL1074-1.jpgFrom inside Victoria - Sol 1074 (True Colors; credits: Dr G. Barca)56 visitenessun commentoMareKromium
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OPP-SOL1063-1.jpgFrom inside Victoria - Sol 1063 (True Colors; credits: Dr G. Barca)56 visitenessun commentoMareKromium
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PSP_009161_1450_RED-01.jpgLong Shadows over Ariadnes Colles (edm - natural colors; credits: Lunexit)56 visiteThis edm shows one of the hills in detail.
The hill appears criss-crossed by long fractures and most of them made apparent by the shadows they cast.
The shadows indicate that the fractures “stick out” from their surroundings, and hence that they are more resistant to erosion. In terrestrial environments this occurs when fluids flow along the fractures, leaving behind cementing minerals or when fractures are filled by igneous materials.MareKromium
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PSP_009161_1450_RED-00.jpgLong Shadows over Ariadnes Colles (ctx frame- natural colors; credits: Lunexit)56 visiteAriadnes Colles is a labyrinth-like cluster of hills, mesas and knobs located near Terra Cimmeria, in the Southern Highlands of Mars.
This image, which covers a portion of that labyrinth, was acquired only a few Soles away from Winter Solstice.
Winter Solstice occurs in the shortest Sol of the year, when the Sun travels the lowest in the Martian sky, making shadows appear very long. These conditions are ideal to analyze modest relief features, that would pass unnoticed when illuminated from above but are highlighted when illuminated from the side.MareKromium
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PSP_009151_1465_RED.jpgRock Outcrops in Southern Mid-Latitude Crater (natural colors; credits: Lunexit)56 visiteThis image shows part of the floor of a large Impact Crater in the Southern Hemisphere. The crater lies at the edge of the Hellas Impact Basin; although it is roughly 50 Km across, it is dwarfed by the giant Hellas structure, which has seen a varied and interesting geologic history.
This image captures a diverse range of rocks on the Crater Floor. A small cliff running across the middle of the image marks the edge of one rock unit, but variations in tone or texture in the northern part of the image suggest a varied history of deposition. Exposures of light, intermediate and dark materials may correspond to different types of deposition, or perhaps alteration after the rocks were laid down. Some units appear rich in boulders, suggesting that they are breaking up into blocks, while at other sites there are thin layers.
This diversity indicates a varied geologic history. Hellas Basin is a low Region, and may have once held lakes or seas where sediments could have been deposited.
This site is also just west of Hadriaca Patera, an old volcano. Sediment could also have been deposited by wind, or in streams on the surface. Unraveling the history of the region will require many images to illustrate the diversity of rocks and map out where they occur.MareKromium
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PSP_009192_1890_RED-00.jpgRelatively Recent Slope Streak started from a Dust Devil (ctx frame - natural colors; credits: Lunexit)56 visiteThis Slope Streak occurred in the time between a Viking image of the bottom of this crater (713A57, which saw no streak) and a MOC image (R12/01917, as reported by Schorghofer et al. (2007).
That paper suggested that the Slope Streak may have been caused by a Dust Devil that had passed by (its track is visible in the MOC image). Our HiRISE image shows that there isn’t a small hill or anything at this Slope Streak’s apex, but that the dust devil track really does intersect with the apex. It is likely that the Dust Devil may have caused this Slope Streak.
Dark Slope Streaks are visible in many places on the Martian surface, often where the dust cover is thick.
One explanation for Dark Slope Streaks is that they are little avalanches in the dust. The apexes of Slope Streaks (such as the point where they start from) are often at little hills or ridges on a larger slope, with the thinking that the dust here is already close to being too steep, and then any little perturbation will start one of these tiny avalanches.
Small craters have also been seen at slope streak apexes.MareKromium
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PHOE-SOL094-MF.jpgThe "Trench" - Sol 94 (True Colors; credits: Dr M. Faccin)56 visitenessun commentoMareKromium
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SOL1344-2.jpgIgneous Variety - Sol 1344 (True Colors; credits: Dr G. Barca)56 visitenessun commentoMareKromium
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