NASA's Spirit Mars rover has arrived at a site dubbed "Home Plate" within Gusev crater. But what the robot found has left scientists puzzled. As the Mars machinery relays images of the area, the sightseeing has sparked healthy debate within the team running the mission. "Well, so far it has been great," said Steve Squyres, lead Mars Rover Exploration scientist at Cornell University. "It's the most spectacular layered rock we've ever seen at Gusev," he told SPACE.com. The images relayed so far by Spirit of Home Plate "really are stunning," Squyres added. "Many of us were pretty much reduced to...