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Fraser
2006-Jun-02, 03:48 AM
SUMMARY: This false colour image, taken by ESA's Mars Express spacecraft, shows the heavily eroded Aram Chaos region on Mars. The region is a 280-km (174-mile) wide circular structure located between two outflow channels. Scientists think that the eastern portion of the nearby Valles Marineris was responsible for torrents of ice and water that chopped up the landscape millions of years ago.

View full article (http://www.universetoday.com/am/publish/eroded_aram_chaos.html)
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Melusine
2006-Jun-02, 12:57 PM
Emily Lakdawalla (http://planetary.org/blog) said something about the Mars images being worthy of hanging in an art gallery, and these are no exception--quite striking and there's more to come!

BTW, Fraser is at a perfect post number: :razz:

Join Date: Jul 2003
Location: Courtenay, BC, Canada
Posts: 8,888

SOFTEC
2006-Jun-03, 04:30 AM
This region has more of the appearance of expansion than any water flow. It appears that a very hot mantle started cracking and lava flowed into the lesions. The surface was very cold and created a scab effect. The surface is not that old either. The meteor hits are of very small size, such as you would expect within the past 10,000 years timeframe and even now. If you look closely, you see "cones" that appear to be created by hot rock and mud flows. Quiet possibly, this was created after a very large meteor hit elsewhere or, tectonics of massive molten rock movement. We need a higher resolution photo within a few meters per pixel to really tell what has happened here.

JonClarke
2006-Jun-03, 11:29 AM
Chaos regions on Mars are the generally the source of major outflow channels, indicating that they have given rise to large amounts of water. Similar textures occur on earth in permafrost regions, though at a much smaller scale. The meting of the ice may well have been triggered by volcanism, evidence for volcanic cones and flows is consistent with evidence for liquid water.

Jon

nebulosity8669
2006-Jun-11, 07:42 PM
What a marvelous image! My first thought, immediately after I made it my screen background, was: What a great jigsaw puzzle that would make.

If any of you have the chance, visit JPL in Pasadena. They have astounding wall-sized prints of some of the most striking planetary images taken in the last 30 years. They make you feel like you are in the image...of course, a few of them are in 3-d, so with the glasses, you are!