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Fraser
2005-Sep-13, 12:31 AM
SUMMARY: This image of a Martian crater was taken by the European Space Agency's Mars Express spacecraft in May, 2004. The crater is unevenly weathered, with a gentle slope on the wind-facing side, and a steep slope on the lee-side - on Earth these features are called ‘barchanes’, and usually form in arid regions. There's a dune field on the bottom of the crater, that seems to be composed of sand of volcanic origin; how it got to the bottom of this crater is a mystery.

View full article (http://www.universetoday.com/am/publish/martian_crater_dunes.html)
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