NASA's Opportunity rover has been on Mars for over 10 years, but that doesn't mean it's no longer useful.

The six-wheeled vehicle landed on the Red Planet on Jan. 25, 2004, and has since sent over 170,000 images back to Earth.

The rover has made a couple important discoveries lately as well, as it found clay minerals proving that water once flowed freely on Mars.

"We've basically found strong evidence for clays on both sides of the planet," said planetary scientist Steve Squyres, according to the Associated Press.

Squyres, a scientist for NASA's Mars Exploration Rover program and co-author of the recently published study in this week's edition of the journal Science, said the rover confirmed findings made by the Curiosity rover last year.

Opportunity has "seen better days" since landing on Mars, however, as it's front right wheel and robotic arm all need repair work done, according to AP.

NASA said the rover is far from done however, especially now that it has discovered water.

"This creates some of the most scientifically interesting opportunities of the entire mission," Mars Exploration Rover project manager John Callas said, according to the Associated Press.

Opportunity also recently discovered a unique object on the red planet unlike anything previously seen before by NASA experts.

The object appeared in pictures taken 12 days apart by NASA's Opportunity rover. On Dec. 26, 2013 the object was not in the location it was found on Jan. 8, according to NASA.

"It looks like a jelly doughnut, white around the outside, red in the middle," said Steve Squyres, the principal investigator of the Mars Exploration Rovers, according to AFP.

The rock has been called "Pinnacle Island," according to Squyres.

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