According to the mission status webpage:
The rover's drive on sol 1378 (Nov. 18, 2007) ended early when Spirit's unusable, right front wheel got snagged on a buried rock, causing the rover to turn and drive into a "keep-out zone." Two Martian days later, on sol 1380 (Nov. 20, 2007), the drive faulted out again when the rover experienced more than 90-percent slip after traveling 3.6 meters (11.8 feet). The rover's handlers continue to work on strategies for enabling Spirit to drive away from the outcrop.
Spirit needs to successfully cross "Home Plate" where it is now, reaching the site and then inching down the slope since Spirit cannot climb that steeply anymore. Although Martian winter is not expected to start until around April 2008, the team wants to have Spirit in position by January.
As soon as Martian winter is over however the intention, says MER science principle investigator Steve Squyres, "is to put the pedal down and head for von Braun." Von Braun is the next science site the team is anxious to get to. Opportunity's landing site was much closer to the equator and not as subject to seasonal fluctuation's in solar power and continues to work away studying the "Smith" rock layer that is part of the "bathtub ring" around Victoria Crater that the rover has recently been able to drop down into.
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