This Aug. 15, 2014, composite image released by NASA and made by NASA's Mars Exploration Rover Opportunity, shows a view looking back toward part of the west rim of Endeavour Crater that the rover drove along, heading southward, during the summer of 2014. NASA announced Thursday, Sept. 11, 2014, that the rover has reached the base of Mount Sharp, its long-term science destination since landing two years ago. Officials say drilling could begin as early as next week at an outcrop of rocks called Pahrump Hills. (AP Photo/NASA, JPL-Caltech, Cornell University, Arizona State University)
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