I don't know, but in that picture they look more like shadows of ridges than holes in the ground. Maybe it's the focus.
From: cavera...@aol.comTo: greater_houston_gro...@yahoogroups.com, Texascavers@texascavers.com, floridacav...@yahoogroups.com, cav...@cs.yale.edu, moca...@lists.umsl.eduSub
Mars Caves Forged by Volcanoes and Meteors
Larry O'Hanlon, Discovery News
Oct. 29, 2007 -- If Mars looks like a primordial Earth-on-ice, the similarity
ends just below the surface where Martian caves are borne not of slow dripping
processes but from brief, intensely violent times, say research
