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Old December 20th 05, 03:33 PM posted to sci.astro.amateur
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Default Why are craters round?

Chris L Peterson:
... Unlike craters on other Solar System bodies,
those on Earth are always altered by weathering and erosion, often
nearly beyond recognition as craters.


The weathering of craters on Earth is quite like the weathering of
craters on other bodies, no?
http://www.msss.com/mars_images/moc/2003/09/19/ and
http://www.astronomy.com/asy/default.aspx?c=a&id=3753 reveal
weathering of craters on Mars. There are also examples of eroded
craters on numerous other bodies, including Venus and the moons of
Saturn
http://www.planetary.org/news/2005/0...mages_of_Titan.
html (and probably all the large moons of both Saturn and Jupiter).

While we usually think of weathering in the terrestrial sense (even if
the wind and rain are on another world) as being largely responsible
for crater weathering, the lunar crater Gassendi shows that aeons of
solar wind may also weather a crater.

Davoud
Also feeling a bit eroded by the weather at the moment...

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