PASADENA, Calif. (AP) - NASA scientists said Thursday they may send the Opportunity rover on a one-way trip to the depths of a crater on Mars so the robot can finish out its days studying stacks of layered rock that may have formed long ago at the bottom of a salty extraterrestrial ocean. The multiple layers of bedrock that line much of the inner slope of Endurance crater stand in cliffs 16 to 33 feet tall in places. They are seen in a sweeping color panorama that NASA released Thursday at Jet Propulsion Laboratory. "It's the most spectacular view we've...
