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NASA: Sanddyne funnet på Mars


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NASA har funnet noen fantastiske sanddyner på Mars!

post-16776-1232544629_thumb.jpg

Release date: 22 May 2000

http://www.msss.com/moc_gallery/ab1_m04/images/M0400291.html

 

Her er samme stedet, tre år senere

post-16776-1232545272_thumb.jpg

Release date: 30 September 2003

http://www.msss.com/moc_gallery/e19_r02/im...1/E2101421.html

 

Disse sanddynene har tilsynelatende ikke forandret seg på tre år, fantastisk.

 

Bilder av sanddynene tatt i en annen vinkel:

post-16776-1232544899_thumb.jpgpost-16776-1232544905_thumb.jpg

Virkelig flotte sanddyner.

 

 

 

"Seeing Mars up close through the narrow angle camera has been a humbling experience. We often find surfaces for which there are no obvious analogs on Earth, like certain ridges that look like dunes. Our terrestrial geologic experience seems, at times, to fail us," Edgett said. "Perhaps it is because water is the dominant force of erosion on Earth, even in the driest desert regions. But on Mars that force of change may have been something else, like wind. The ridges seen in places like the Valles Marineris floors are strange. They aren't dunes because they occur too close together, their crests are too sharp, their slopes too symmetrical. They often appear to be a specific layer of material that has undergone erosion -- we just wish we knew what processes are involved that cause this kind of erosion."
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