Unparallel lines

The finding of unparalleled lines soon after Opportunity's landing in 2004 gives scientists clues about Mars's landscape, and indicates it was influenced by moving currents, such as volcanic flow, wind, or water.

Blueberry-like spheres

This image taken in March 2004 shows spherules, nicknamed blueberries, which have helped scientists understand Mars's former wet environment.

Iron meteorite

The photo taken Jan. 6, 2005 shows a large iron meteorite nicknamed Block Island, found by Opportunity.

10 Kilometers

On Feb. 7, 2007, Opportunity had rolled past the 10-kilometer mark.

Shelter Island

Weeks after finding its first meteorite, Block Island, Opportunity finds Shelter Island. It took this photo in October 2009.

12 Miles

On Jan. 28, 2010, Opportunity passed 12 miles of driving, and NASA shared this artist concept to highlight the milestone.

20 Miles

On July 17, 2011, Opportunity surpassed 20 miles of driving.

More blueberries

Opportunity discovered more blueberry-like spheres, which have helped scientists understand Mars's once wet environment, in September of 2012.

Clay rocks

The discovery of clay rocks in 2013 suggests Mars in earlier days had a neutral-water environment.

10-Year Selfie

An Opportunity selfie taken early January 2014.

Pinnacle Island

Nicknamed Pinnacle Island, a fist-sized rock appeared in front of Opportunity early January 2014, puzzling NASA scientists. The image above shows the ground on Dec. 26, 2013, the 3,528th Martian day, or Sol, and Jan. 8, 2014, or Sol 3540.

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Photos: The Opportunity Rover's 10 Years On Mars

Remarkably, this Martian rover is still chugging along.

Ten years ago, the Opportunity rover landed on Mars. What started out as a three-month mission has remarkably stretched into a decade.

The rover has certainly aged during this time. Mars Exploration Rover project manager John Callas says Opportunity suffers from arthritis in its robotic arm, has a non-functioning front wheel, and occasionally has "senior moments" with its flash memory. Even so, it’s chugging along into its second decade on the red planet, unlike its twin Spirit, which landed weeks before Opportunity did in 2004 and gave out after being stuck in a sand trap in 2010. In 2012, Curiosity joined Opportunity on Mars.

We’ve dug into NASA’s photo archives to reflect back on Opportunity’s tenure. Here's to 10 more years.

[Image: NASA/JPL-Caltech]

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