This image obtained October 16, from the Mars Hand Lens Imager (MAHLI) camera on NASA's Mars rover Curiosity shows a small bright object on the ground beside the rover at the "Rocknest" site. NASA's ... more 

This image obtained October 16, from the Mars Hand Lens Imager (MAHLI) camera on NASA's Mars rover Curiosity shows a small bright object on the ground beside the rover at the "Rocknest" site. NASA's Mars rover has swallowed its first scoopful of dirt from the Red Planet's surface -- and found some bright-colored objects that experts briefly thought might be man-made, the US space agency said less