Humphrey on the Inside

Opportunity's wheels dug more than 10 centimeters (4 inches) deep into the soft, sandy material of a wind-shaped ripple in Mars' Meridiani Planum region during the rover's 446th martian day, or sol...

Environmental testing

This March 21, 2016, image from the navigation camera on NASA's Mars rover Opportunity shows streaks of dust or sand on the vehicle's rear solar panel after a series of drives during which the rove...

This artist's rendering depicts NASA's Mars Exploration Rovers, Spirit and Opportunity. The twin rovers were launched in 2003 and arrived on Mars in January 2004.

This graphic shows the ongoing contributions of NASA’s rovers and orbiters during a Martian dust storm that began on May 30, 2018.

NASA's Mars Exploration Rover Opportunity captured this stereo view after beginning to ascend the northwestern slope of "Solander Point" on the western rim of Endeavour Crater.

This image from the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity shows where a rock called "Pinnacle Island" had been before it appeared in front of the rover in early Jan...

This image taken by the panoramic camera onboard Opportunity shows the rover's now-empty lander, the Challenger Memorial Station, at Meridiani Planum, Mars.

This color view of a mineral vein called "Homestake" comes from the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity.

After driving uphill about 139 feet (42.5 meters) during the 3,485th Martian day, or sol, of its work on Mars (Nov. 12, 2013), NASA's Mars Exploration Rover Opportunity captured this image with its...

The Mars Exploration Rover-2 is moved to a workstand in the Payload Hazardous Servicing Facility.

A lunar eclipse, a solar eclipse and Mars has a close encounter with a comet.

This stereo scene from NASA's Mars Exploration Rover Opportunity shows part of "Marathon Valley," a destination on the western rim of Endeavour Crater, as seen from an overlook north of the valley.

Spirit acquired this mosaic while investigating the area east of the elevated plateau known as "Home Plate" in the "Columbia Hills." The trench exposed a patch of nearly pure silica, with the comp...

This before-and-after pair of images of the same patch of ground in front of NASA's Mars Exploration Rover Opportunity 13 days apart documents the arrival of a bright rock onto the scene.

6th Year Anniversary Graphic

While driving eastward toward the northwestern flank of "McCool Hill," the wheels of NASA's Mars Exploration Rover Spirit churned up the largest amount of bright soil discovered so far in the mission

Members of the Mars Exploration Rover Mission's Entry, Descent and Landing team rejoice at the news that mission control received its first signal from Spirit, indicating the rove...

Rover team members with rover.

Researchers used NASA's Mars Exploration Rover Opportunity to find a water-related mineral on the ground that had been detected from orbit, and found it in the dark veneer of rocks on the rim of En...

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.

In the Payload Hazardous Servicing Facility, an overhead crane lowers the Mars Exploration Rover (MER) aeroshell toward a rotation stand.

This image is an approximately true color rendering of the slope of "Endurance Crater," which the Opportunity rover explored in 2004.

From left: Dave Lavery, program executive for Solar System Exploration at NASA Headquarters, Dr. Ed Weiler, associate administrator, Office of Space Science, NASA Headquarters, Pe...

Entry, descent and landing manager, Rob Manning (facing camera), hugs Richard Cook, the current Mars Exploration Rover project manager after Opportunity's successful landing at Meridiani Planum, Mars.