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Tyrrhena Terra
© philcUK
(copyright information)
Uploaded: 08/27/07 12:05 AM GMT
Tyrrhena Terra
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(Main) space
I figured this detailed but quite oblique shot of Mars made for quite an interesting desktop image. The High Resolution Stereo Camera on board ESA’s Mars Express obtained these images of the Tyrrhena Terra Impact region on Mars. On the 10th of May 2007, the orbiting spacecraft snapped the pictures of the region located in the south eastern region of the planet. The Sun illuminates the scene from the south-west.
Credit: European Space Agency.
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::jswgpb
08/27/07 9:35 PM GMT
It does make a good DT, great post Phil.
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I find it interesting that there is what appears to be a mound in the middle of each crater. The meteor itself maybe? Very neat picture none the less.
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There are 00000010 kinds of people in the world. Those who speak binary and those who don't. -mw
Mike – the mounds in the centre of the craters aren’t the foreign body that struck the planet or moon – they usually disintegrate or liquefy on impact and get thrown back out as part of the impact ejecta. What you are seeing here is referred to as a complex crater. Above a certain size, which varies with planetary gravity, the collapse and modification of the crater is much more extensive, and the resulting structure becomes a complex crater or central peak crater. The collapse of the cavity is driven by gravity, and involves both the uplift of the central region and the inward collapse of the rim. The central uplift is formed in a process in which material with little or no strength attempts to return to a state of gravitational equilibrium. The surrounding ‘basin’ is formed by the collapse of material that has been destabilised in the impact, ether by pulverisation, melting or vaporisation. The melted wax petal like formations around the rim of the crater are called the ejecta blanket and the appearance of these petal formations may be linked to subsurface liquids.
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