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ESP_011618_1885_RED_abrowse-01.jpgRecent Double-Impact (edm - possible Natural Colors; credits: Lunar Explorer Italia)68 visiteThe MRO Context Imager (CTX) team has been discovering many new impact events on Mars, and then they request HiRISE follow-up imaging to confirm an impact origin and to identify and measure the craters.
Crater clusters are common as these small (typically less than 1 meter diameter) objects break up in the thin Martian air and separate a little bit to make crater clusters up to a few hundred meters wide. The example shown here is the result of an impact that occurred between May 2003 and September 2007.
It was first discovered as a dark spot in a CTX image acquired in March 2008, but later found to be partly visible at the very edge of a CTX image acquired in September 2007.
A dark spot is not present in the previous image of this location with sufficient resolution to have detected it, acquired by the visible THEMIS camera on Mars Odyssey in May 2003. Thus the impact might have formed anytime between May 2003 and September 2007. The dark markings are created by removing or disturbing the surficial dust cover, and so far new impact sites have been discovered only in dust-covered regions of Mars.
Although small Martian crater clusters are common, this example is unusual because there is a dark line between the two largest craters. We hypothesize that atmospheric breakup coincidentally made two nearly equal-size objects that impacted close together in space and time so the air blasts interacted with each other to disturb the dust along this line.
Hundreds of these small objects (mostly asteroid fragments) impact Mars per year. A comparable number of small objects impact Earth each year, but explode in the upper reaches of our atmosphere and have no effect on the surface, fortunately for those of us who live here.MareKromium
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SOL483-2N169237348ESFAAB2P1560L0M1.jpgGusev Skyline - Sol 483 (Natural Colors; credits: Lunar Explorer Italia)68 visitenessun commentoMareKromium
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SOL661-6-GB-LXT.jpgRocky Skyline - Sol 661 (possible True Colors; credits: Dr Barca & Lunar Explorer Italia)68 visitenessun commentoMareKromium
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Landslide-Terra_Sirenum-20090302a-PCF-LXTT.jpgLandslide in Terra Sirenum (Enhanced Natural Colors; credits: Dr Paolo C. Fienga - Lunar Explorer Italia)68 visiteCoord.: 11,6° South Lat. and 186,9° East Long.MareKromium
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PSP_010501_2615_RED_abrowse.jpgAbalos Undae (Natural Colors; credits: Lunar Explorer Italia)68 visiteMars Local Time: 14:25 (early afternoon)
Coord. (centered): 81,6° North Lat. and 279,6° East Long.
Spacecraft altitude: 318,7 Km (such as about 199,2 miles)
Original image scale range: 63,8 cm/pixel (with 1 x 1 binning) so objects ~ 1,91 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,1°
Phase Angle: 69,6°
Solar Incidence Angle: 70° (meaning that the Sun is about 20° above the Local Horizon)
Solar Longitude: 145,8° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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SOL1833-1843-GB-CHANGINGS-01.jpgThe "Unbelievable Behaviour" of some Martian pseudo-Rocks... - Sol 1833/Sol 1843 (credits: Dr G. Barca)68 visitenessun commentoMareKromium
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Minds-MF.jpgA Beautiful Mind (by Marco Faccin)68 visitenessun commentoMareKromium
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SOL626-GIF-GP.gifBetween Day and Night... - Sol 626-631 (GIF-Movie; credits: Giorgio Picciau)68 visiteUn interessantissimo GIF-Movie realizzato dal nostro Amico e Partner, Giorgio Picciau, il quale ci mostra (a condizione che osserviate il filmato con la MASSIMA attenzione!) delle possibili e minime - ma non per questo scarsamentre significative - alterazioni digitali (tampering).
Le Yellow Bars aggiunte da Giorgio Vi saranno di uteriore aiuto per cogliere delle leggere (e non agevolmente spiegabili) variazioni del contesto ripreso.
ATTENZIONE: onde non essere fraintesi, ribadiamo che non stiamo parlando di un SICURO Image Tampering, ma solo di una POSSIBILE alterazione (ed infatti l'eventualità che le citate variazioni di contesto - che qualifichiamo come "minime" - possano essere attribuite sia ad un modestissimo cambio delle condizioni superficiali esterne - Tau + lighting conditions -, sia ad un fattore generico di disturbo del segnale nella trasmissione dei dati da Marte a Terra - noise + data loss - non è eliminabile).
Ed in ogni caso...Complimenti a Giorgio Picciau per l'Occhio e la Pazienza!MareKromium
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APOLLO_15_-_AS15-84-11309_HR.jpgAS 15-84-11309 - The Texture of Hadley68 visite144:47:51 MT - This is the first in a vertical strip of 500mm images of Mt. Hadley taken by Dave Scott from Station 6. Two sets of linear features can be seen on the mountain: a set running diagonally down from the upper right to the lower left and a nearly horizontal set dipping down slightly to the left. The diagonal set is the more prominent when the mountain is viewed as a whole and these are believed to be due to lighting effects. The features in the horizontal set, when viewed from lunar orbit, appear to be benches that may have resulted from slumping on the steep mountain face. A full discussion can be found starting on page 5-11 in the Apollo 15 Preliminary Science Report.MareKromium
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SOL1919-2N296733443ESFB1DQP1561L0M1.jpgHorizon... - Sol 1919 (Natural Colors; credits: Lunar Explorer Italia)68 visitenessun commentoMareKromium
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PSP_010630_2115_RED_abrowse-00.jpgCraters and possible "Pingo" in Mamers Vallis (ctx frame - Natural Colors; credits: Lunar Explorer Italia)68 visiteThis image was suggested by Mr. Dennis Mitchell's 8th grade NASA team, Evergreen Middle School, Cottonwood, CA, as part of the HiRISE Quest Student Image Challenge.
They write: "Located near Mamers Valles, this image shows numerous fluvial features that indicate this area was once rich with water. The lineated valley fill suggests an ice-rich soil. [Of particular interest] is a small cone-like feature [located on the floor of a 2 Km-diameter] impact crater in the center of the ctx frame.MareKromium
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The_Sun~0.jpgPurple Sun (by Marco Faccin)68 visitenessun commentoMareKromium
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