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Mars rover clocks 10 years on job

| Thursday, Jan. 23, 2014, 9:09 p.m.
This artist rendering depicts the NASA rover Opportunity on the surface of Mars. Opportunity landed on the red planet on Jan. 24, 2004, and is still exploring. Its twin, Spirit, stopped communicating in 2010. (AP Photo/NASA)

LOS ANGELES — The rover Opportunity is still chugging along, a decade since it landed on Mars.

Sure, it has some wear and tear. One of its six wheels and two instruments stopped working long ago. It has an arthritic joint. Its flash memory occasionally suffers a senior moment.

But these problems are considered minor for a journey that was supposed to be just a three-month adventure.

“No one ever expected this — that after 10 years a Mars exploration rover would continue to operate and operate productively,” project manager John Callas said Thursday.

NASA has scrutinized Earth's planetary neighbor for decades, starting with quick flybys and later with orbiters, landers and rovers.

Opportunity touched down on Jan. 24, 2004. Its twin Spirit, had landed several weeks earlier. The rovers outlasted their warranty by years, but Spirit stopped phoning home in 2010 when it got stuck in sand.

Meanwhile, Opportunity has logged 24 miles crater-hopping. The solar-powered NASA rover is now in a sunny spot on the rim of Endeavour Crater where it's spending its sixth winter poking into rocks and dirt.

Its power levels have unexpectedly improved. A recent “selfie” showed dust on its solar panels was later wiped away by blowing winds.

Early discoveries by the two rovers pointed to a planet that was once tropical and moist. However, the signs of water suggested an acidic environment that would have been too harsh for microbes.

More recently, Opportunity uncovered geologic evidence of water in Endeavour Crater that's more suited for drinking — a boon for scientists searching for extraterrestrial places where primitive life could have thrived. The crater is the largest of five craters examined by Opportunity.

A study published by the journal Science Friday — on Opportunity's 10th anniversary — determined the rocks from the crater are the oldest yet — about 4 billion years old. The rocks interacted with water during a time when environmental conditions were favorable for microscopic organisms.

“This is really a neat area,” said deputy project scientist Ray Arvidson of Washington University in St. Louis.

In 2012, Opportunity was joined on Mars by Curiosity, which is rolling across bumpy terrain toward a mountain. With snazzy tools like a laser, Curiosity quickly became the world's favorite rover.

Opportunity snatched some of the attention back this month when it discovered a rock shaped like a jelly doughnut that suddenly appeared in its field of view, probably after its wheel kicked it up. Scientists said it's unlike any rock they have seen on Mars before.

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