Mars research teams are ecstatic about the progress of the Spirit and Opportunity rovers, each now in position to open new chapters in exploring the enigmatic red planet. The Opportunity Mars rover at Meridiani Planum has begun wheeling into a huge and deep impact crater, dubbed Endurance. Meanwhile, on the other side of the planet, sister ship Spirit has nearly reached the base of the impressive Columbia Hills, perhaps a geological paradise within Gusev Crater.