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Re:Perfectly round shape on the moon. by cromulent on Tuesday May 17, 2011 @12:56AM (#2555324)
Nice photo. All the things you ask about are craters. The large one is Tycho.

http://en.wikipedia.org/wiki/Tycho_(crater)

Re:Perfectly round shape on the moon. by brupm2 on Tuesday May 17, 2011 @09:34AM (#2556283)
Interesting, it's so perfectly round. Thank you.