NASA'sbeleaguered Mars rover Spirit may no longer be much of a rover, but it's notthe end of the road for her yet. The semi-stuck robot still has plenty ofscience left to do on the red planet, mission scientists say.
"There?sactually a whole class of scientific objectives that you can only address froma vehicle that doesn?t move. So far we've pretty much tended to ignorethose," said rover mission principal investigator Steven Squyres ofCornell University in Ithaca, New York.
The rover'shandlers will try over the next week to position the rover to maximize theamount of solar radiation it receives to give it the best chance of making itthrough the winter.
"Energyis getting so low that we think we only have, you know, at maximum anotherhalf-dozen drives to be able to do that before we have to hunker down and getthrough the winter campaign," said science team member Ray Arvidson of theWashington University in St. Louis.
That wintercampaign won't see the rover doing much: "In the dead of winter, it cantry to survive, that's about it," Arvidson told SPACE.com.
Spirit isequipped with an X-band transmitter and receiver on its high-gain antenna thatcan find the Deep Space Network and establish communication over about 20 to 30minutes. Doppler tracking of the rover's signal can "very, very accuratelylocate the rover." Those measurements added up over six months could beused to locate the precession, or wobble, of Mars' spin axis.
Smallvariations in the precession can in part be driven by the properties of a planet'score, such how big it is or whether it is liquid or solid.
"Sothis could provide major new information about the interior," Arvidsonsaid.
A roverwouldn't be able to do this kind of science because it would constantly changeposition, so a stationary target is needed, Squyres noted. Spirit's predicamentprovides the perfect opportunity to do this kind of science, Arvidson said.
Spirit willalso operate a weather station while it's stuck in place.
Morelong-range driving is out of the question, because even if it is freed, Spiritwill still only be a 4-wheel-drive vehicle ? good if you're climbing mountainson Earth, but not if you're a Mars rover. The rover has six wheels, like itsrobotic twin Opportunity, but two of its wheels are broken.
"Withfour-wheel drive in this pretty dicey area, we're not going to go veryfar," Arvidson said.
With thebackwards motions done over the past week, "we already have newly exposedsoils," Arvidson said. So even though Spirit will rove no more,"there's still a lot to do," he added.
How muchSpirit will be able to do in this new phase of the rovermission isn't known; even mission managers don't know how long the hobbledrobot will last.
"Arewe going to have an eighth year?" Arvidson asked.
- Video - Spirit: The Little Mars Rover That Could
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