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Spirit's days of wandering the Martian landscape are over, as NASA resigns itself to leaving the bogged-down rover in place to survive the Red Planet's winter.

The space agency said Tuesday that it's ending efforts to extricate the robot from the loose soil where it's been trapped since April. Spirit will instead continue to function as a stationary science platform – so long as it makes it through the harsh winter months.

NASA's new plan for the next few weeks is to jostle Spirit into place where it's solar arrays can soak in as much sunlight as possible. In past winters, a then-mobile Spirit had been able to position itself to allow for maximum sun exposure. But its current fix has left Spirit caught at an unfavorable tilt.

Spirit's electronics are designed to withstand temperatures of about -40° Fahrenheit while operating and -67° F in hibernation mode, according to NASA. Scientists predict the Martian winter – which begins in May – will see temperatures drop below -40° F, leaving no other option than to abandon rescue plans.

Time is now of the essence to position the rover for the Martian winter. Solar power is expected to become insufficient to power any further driving by mid-February, giving NASA only a few weeks to prepare the rover.

“Getting through the winter will all come down to temperature and how cold the rover electronics will get,” said John Callas, project manager for Spirit at NASA's Jet Propulsion Laboratory in a prepared statement. “Every bit of energy produced by Spirit's solar arrays will go into keeping the rover's critical electronics warm, either by having the electronics on or by turning on essential heaters.”

If Spirit wakes up in the spring, NASA intends to give the machine new life as a stationary science platform.

“This is not a day to mourn Spirit. This is not a day of loss,” said McCuistion. “Spirit will continue to make contributions to science and the understanding of Mars. It will continue to excite the public globally, I believe.”

NASA said there's a class of experiments that only a stationary vehicle can do that the agency has put off during its six years of Martian mobility. One is to begin studies of tiny wobbles in the rotation of Mars in order to determine if the core is liquid or solid. Tools on Spirit's robotic arm can also examine the composition of nearby soil. Spirit can also watch how wind pushes the soil across the terrain from its new permanent home on Mars. ®

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