PASADENA, Calif., Oct. 9 (UPI) -- The U.S. space agency's Phoenix Lander is investigating soil on Mars' northern plains for signs that water was once present.
The National Aeronautics and Space Administration said the lander, during the past two weeks, used its 8-foot-long robotic arm to move a rock nicknamed "Headless" about 16 inches and snapped an image of the rock with its camera.