The Mars rover Spirit will go on a two-week trip through rocky terrain to reach the border of a crater named Bonneville, NASA announced Thursday. The crater is 150 meters (492 feet) long and about 15 meters (49 feet) deep and offers a window into Mars’ geology, said Ray Arvidson, assistant chief of scientists at the National Aeronautics and Space Administration’s Jet Propulsion Laboratory in Pasadena, California.