After a weekend of driving that took it about 10 feet across the surface of Mars, the Spirit rover was parked on Monday in front of a rock that NASA scientists plan to study for much of the next week. Though Spirit is capable of moving more quickly across the rugged surface of the red planet, the six-wheeled craft spent 30 minutes traveling to the rock, nicknamed "Adirondack" by project managers, because like any Earth-bound tourist it stopped repeatedly to take pictures. "We went for a little Sunday drive," joked mission manager Mark Adler. The scientists believe that the pyramid-shaped...