This image shows the view from the Mars Exploration Rover Spirit after it successfully completed a 115 degree turn to face northwest, the direction it will roll off the lander. (Xinhua Photo/Reuters) 

    This image shows the view from the Mars Exploration Rover Spirit after it successfully completed a 115 degree turn to face northwest, the direction it will roll off the lander. The image was taken by the rover's navigation camera. (NASA website)