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Is it me, or are the caves on mars unusually (un-naturally) round? Are there any equivalent photos of caves on earth?<br /><br />http://msnbcmedia.msn.com/j/msnbc/Components/Photos/070319/070319_marscaves_hmed_940a.hlarge.jpg<br /><br />http://www.space.com/scienceastronomy/070402_mm_mars_caves.html