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| Description: The central indentation in this Messenger image from 2009 is believed to be a caldera (sunken vent) of an explosive volcano on Mercury. It is unlikely to be an impact crater, as it completely lacks a raised crater wall. Picture Stats: Views: 646 Filesize: 198.84kB Height: 900 Width: 900 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=16005 |