Rover Ready to Roll Onto Martian Surface By ANDREW BRIDGES, AP Science Writer PASADENA, Calif. - NASA 's Spirit rover has fully unfolded itself and stretched up to its full 4-foot, 11-inch height, making it ready to drive off the lander that delivered it to Mars, the space agency said. The rover could reach the martian surface as early as Wednesday morning. "It now stands at full height and all six wheels are in their final position," mission manager Jennifer Trosper said during a news conference at NASA's Jet Propulsion Laboratory on Saturday. The unfolding was one of the most...