NASA's Mars Opportunity rover captured this image of an outcrop called "Olympia" along the northwestern margin of the "Erebus" crater on the planet Mars in this photograph released by NASA December 5, 2005. NASA's durable twin Mars rovers have successfully explored the surface of Mars for a full Martian year (687 Earth days). NO ARCHIVES REUTERS/NASA/JPL-Caltech/Cornell/Handout 0 Photo: HO