NASA's attempts to free its Mars rover Spirit from deep sand met some minor success recently. The body of the vehicle was lifted half an inch, and Spirit moved 2.5 inches. That's not much, but it's better than previous attempts.
The odds, however, are still probably against getting the rover free. NASA, therefore, is also preparing for Spirit's future as a stationary probe. The area immediately around Spirit happens to be geologically interesting; several intriguing rocks are within reach of its robotic arm. So, NASA wants to free the rover, but it doesn't want to do anything that might preclude continuing to gather data from where Spirit is now.
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