These conglomerate rocks on Mars could only have been formed by water. (NASA/JPL-Caltech/MSSS)
The rover found rocks that could only have been formed by water currents.
The next step in exploring Mars, the rover named Curiosity has safely landed.
Curiosity landed on Mars on Aug. 5. (Los Alamos National Laboratory/Creative Commons)
One image shows Curiosity dangling from a parachute before touchdown.