Mars rover to enter giant crater (AP)

This image provided by NASA Friday Sept. 7, 2007 shows the view from the rim of Mars' Victoria Crater about 130 feet from where controllers intend to start the Opportunity rover's descent inside the crater. Victoria Crater contains an exposed layer of bright rocks that may preserve evidence of interaction between the Martian atmosphere and surface from millions of years ago, when the atmosphere might have been different from today's. Victoria is the biggest crater Opportunity has visited. Opportunity's planned descent into the giant Victoria Crater was delayed, but now the rover is preparing to drive into the 800-meter-diameter crater (half-mile-diameter) as early as Sept. 11.  (AP Photo/NASA)AP - Two months after surviving a giant dust storm, one of NASA's robotic rovers on Mars began a risky drive Tuesday into a crater blasted open by a meteor eons ago.