This image taken by the panoramic camera onboard Opportunity shows the rover's now-empty lander, the Challenger Memorial Station, at Meridiani Planum, Mars. Credit: NASA
This image from Opportunity's panoramic camera features the remains of the heat shield that protected the rover from temperatures of up to 2,000 degrees Fahrenheit as it made its way through the martian atmosphere. Credit: NASA
This stunning image features the heat shield impact site of NASA's Mars Exploration Rover Opportunity. Its heat shield hit the ground south of "Endurance Crater" on Jan. 24, 2004. Credit: NASA
This approximate true-color panorama, dubbed "Lion King," shows "Eagle Crater" and the surrounding plains of Meridiani Planum. Credit: NASA
NASA's Mars Exploration Rover Opportunity captured a view of wispy afternoon clouds, not unlike fair weather clouds on Earth, (Oct. 2, 2006). Credit: NASA
As Opportunity crept farther into "Endurance Crater," the dune field on the crater floor appears even more dramatic, as seen in this false-color image. Credit: NASA
This self-portrait of NASA's Mars Exploration Rover Opportunity comes courtesy of the Sun and the rover's front hazard-avoidance camera. Credit: NASA
The pointy features, dubbed "Razorback," in this image may only be a few centimeters high but they generate major scientific interest. Credit: NASA
This view combines frames taken by the panoramic camera on Opportunity's 652nd through 663rd Martian days, or sols (Nov. 23 to Dec. 5, 2005), at the edge of "Erebus Crater." Credit: NASA
This view of a rock called "Block Island," the largest meteorite yet found on Mars, comes from the panoramic camera (Pancam) on Opportunity. Credit: NASA
Opportunity used its navigation camera for this northward view of tracks the rover left on a drive from one energy-favorable position on a sand ripple to another. Credit: NASA
A self-portrait of NASA's Mars Exploration Rover Opportunity taken in late March 2014 (right) shows that much of the dust on the rover's solar arrays has been removed since a similar portrait from January 2014 (left). Credit: NASA
This scene from NASA's Mars Exploration Rover Opportunity shows "Lunokhod 2 Crater," which lies south of "Solander Point" on the west rim of Endeavour Crater. Credit: NASA
This vista from NASA's Mars Exploration Rover Opportunity shows "Wdowiak Ridge," from left foreground to center, as part of a northward look with the rover's tracks visible at right. Credit: NASA
The small spherules on the Martian surface in this close-up image are near Fram Crater, visited by NASA's Mars Exploration Rover Opportunity during April 2004. Credit: NASA
This close-up view of a target rock called "Last Chance" was acquired by the microscopic imager on the arm of NASA's Mars Exploration Rover Opportunity on March 3, 2004. Credit: NASA
On March 20, 2004, NASA's Mars Exploration Rover Opportunity used a wheel to dig a trench revealing subsurface material beside the lander hardware. Credit: NASA
This scene from NASA's Mars Exploration Rover Opportunity looks upward at "Knudsen Ridge" on the southern edge of "Marathon Valley" from inside the valley. Credit: NASA
From its perch high on a ridge, NASA's Mars Exploration Rover Opportunity recorded this image of a Martian dust devil twisting through the valley below. Credit: NASA
Marathon Valley" on Mars opens northeastward to a view across the floor of Endeavour Crater in this scene from the panoramic camera (Pancam) of NASA's Mars Exploration Rover Opportunity. Credit: NASA
This scene from the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity shows "Spirit Mound" overlooking the floor of Endeavour Crater. Credit: NASA
This May 29, 2016 photograph was captured by the microscopic imager on NASA's Mars Exploration Rover Opportunity, with enhanced color. Credit: NASA
NASA's Mars Exploration Rover Opportunity worked for 30 months on a raised segment of Endeavour Crater's rim called "Cape Tribulation" until departing that segment in mid-April 2017. Credit: NASA
Toward the right side of this scene is a broad notch in the crest of the western rim of Endeavour Crater. Wheel tracks in that area were left by NASA's Mars Exploration Rover Opportunity. Credit: NASA
This late-afternoon view from the front Hazard Avoidance Camera on NASA's Mars Exploration Rover Opportunity shows a pattern of rock stripes on the ground, a surprise to scientists on the rover team. Credit: NASA
NASA's Mars Exploration Rover Opportunity recorded the dawn of the rover's 4,999th Martian day, on Feb. 15, 2018, yielding this processed, approximately true-color scene. Credit: NASA/JPL-Caltech/Cornell/USGS<br>