Humphrey on the Inside

This is a look inside a soil trench or drift dubbed 'Serpent' after the rover successfully dug into the side of the drift.

In this selfie, Spirit shows her solar panels gleaming in the Martian sunlight and carrying only a thin veneer of dust two years after the rover landed and began exploring the red planet.

NASA's Opportunity rover appears as a blip in the center of this square. This image taken by HiRISE, a high-resolution camera onboard NASA's Mars Reconnaissance Orbiter, shows the dust storm over P...

Results from Opportunity and Curiosity show Mars could have supported life.

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 ...

The piece of metal with the American flag on it in this image of a NASA rover on Mars is made of aluminum recovered from the site of the World Trade Center towers in the weeks after their destruction.

Wheel tracks from NASA's Mars rover Opportunity descending and departing the "Cape Tribulation" segment of Endeavour Crater's rim are visible in this April 21, 2017, view from the rover's Pancam. T...

The nose cone of the rocket separates during the launch phase and the Mars Exploration Rover is sent on a seven-month journey to Mars.

This full-circle panorama shows the terrain around the NASA Mars Exploration Rover Opportunity during the 3,105th Martian day, or sol, of the rover's work on Mars (Oct. 18, 2012).

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.

This image shows NASA's Mars Exploration Rover Opportunity perched on the edge of "Concepción" crater in Meridiani Planum, Mars.

This view of a rock called "Block Island," the largest meteorite yet found on Mars.

Rover 1 sits atop the deployed lander with its solar arrays and wheels stowed.

These views of Mars are just a small sampling from the 124,000 images returned by the Spirit rover. (Audio: music only)

This view from NASA's Opportunity Mars rover shows part of "Marathon Valley" as seen from an overlook north of the valley. It was taken by the rover's Pancam on March 13, 2015. This version is pres...

This photo shows fifteen of the women engineers and scientists who work on the Mars Exploration Rover. They are standing behind or kneeling beside a precise replica of the rover in the mission cont...

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 image superimposes an artist's concept of the Mars Exploration Rover Opportunity on the rim of Victoria Crater. It is done to give a sense of scale.

Take JPL Education's Pi Day challenge featuring real-world questions about NASA spacecraft -- then tweet your answers to @NASAJPL_Edu using the hashtag #PiDay. Answers will be revealed on March 16.

This 180-degree mosaic of images from the navigation camera on the NASA Mars Exploration Rover Opportunity shows terrain near the rover during the 3,153rd Martian day, or sol, of the rover's work o...

Some of the team members from NASA's Mars Exploration Rover project were still in college -- or even high school -- when the rovers landed in 2004. Hear their stories of becoming part of this remar...

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

Opportunity used its panoramic camera to record this eastward horizon view on the 2,407th Martian day, or sol, of the rover's work on Mars (October 31, 2010).

The second Mars Exploration Rover, Opportunity, was the first NASA mission lifted on what is referred to as a Delta II "heavy" rocket.

View the many unique areas that the Mars Exploration Rover Opportunity traveled during its 11 year historic journey. (Audio: music only)