The chief scientist of NASA missions of exploration rovers on Mars, Steve Squyres, announced the 'mysterious' appearance of a rock at the Opportunity rover, in a place where 'there was nothing 12 days before.'

The images captured by the robot generated a stir in the team leading the mission, which is already mulling possible explanations for the sudden appearance of this rock.
The announcement was made during a ceremony at the California Institute of Technology (Caltech ), which is celebrating 10 years of service on Mars Opportunity . During the meeting, the photographs sent by the rover 12 days apart, in which you can see almost the same landscape with the difference in the presence of a rock show .
Opportunity was standing in that area due to bad weather on Mars. Now , the experts kept there until they can resolve the reason for this 'surprise' . Or rock was thrown to that spot after a meteorite impact or they consider likely , arrived there after detached by the passage of Opportunity : So far, two possible explanations were shuffled .