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Blast from the (Very Recent) Past
In the center of this image is a very sharp-rimmed impact crater just 35 mt wide. 
It lies in a bright, dust-covered region, but is surrounded by a slightly darker spot about 3 Km wide. The impact event created a blast of high winds that disturbed the dust and darkened the spot.
Since dust is constantly settling over the Region, the fact that we can still see the dark region means the impact event occurred of late, perhaps in recent decades. There are many dark streaks on topographic slopes over an even wider region surrounding the dark spot - these could be due to dust avalanches triggered by the impact, either from the air blast or from seismic shaking of the ground.
There are also rays of very small (approx. 1 mt in diameter) secondary craters extending radially outward from the 35-mt crater, created by the impact of rocks ejected from the main crater. 
Thus a small impact crater has modified the surface over an area more then 10.000 times greater than that of the crater's interior.
Parole chiave: Mars from orbit - Craters - Recent Impact Crater

Blast from the (Very Recent) Past

In the center of this image is a very sharp-rimmed impact crater just 35 mt wide.
It lies in a bright, dust-covered region, but is surrounded by a slightly darker spot about 3 Km wide. The impact event created a blast of high winds that disturbed the dust and darkened the spot.
Since dust is constantly settling over the Region, the fact that we can still see the dark region means the impact event occurred of late, perhaps in recent decades. There are many dark streaks on topographic slopes over an even wider region surrounding the dark spot - these could be due to dust avalanches triggered by the impact, either from the air blast or from seismic shaking of the ground.
There are also rays of very small (approx. 1 mt in diameter) secondary craters extending radially outward from the 35-mt crater, created by the impact of rocks ejected from the main crater.
Thus a small impact crater has modified the surface over an area more then 10.000 times greater than that of the crater's interior.

PSP_004026_1765-3-GB-PCF-LXTT.jpg PSP_004026_1765_RED_abrowse-10-MF-PCF-LXTT.jpg PSP_004030_1855_RED_browse.jpg PSP_004038_1255_RED_abrowse.jpg PSP_004046_2080_RED_browse-PCF-LXTT.jpg
Informazioni sul file
Nome del file:PSP_004030_1855_RED_browse.jpg
Nome album:MareKromium / Mars Reconnaissance Orbiter (MRO)
Valutazione (4 voti):55555(Mostra dettagli)
Parole chiave:Mars / from / orbit / - / Craters / - / Recent / Impact / Crater
Copyright:NASA/JPL/University of Arizona e Lunar Explorer Italia per la pulizia digitale e la colorizzazione del frame
Dimensione del file:2509 KiB
Data di inserimento:Giu 28, 2007
Dimensioni:4076 x 2048 pixels
Visualizzato:56 volte
URL:https://www.lunexit.it/gallery/displayimage.php?pid=17279
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MareKromium   [Feb 13, 2011 at 04:45 PM]
Un esempio bellissimo e lampante di "impatto/non-impatto" (osśa di traccia lasciata al suolo da un bolide disintegratosi quasi del tutto PRIMA di impattare il suolo stesso). - paolo

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