Humphrey on the Inside

This Sept. 21, 2016, scene from the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity shows "Spirit Mound" overlooking the floor of Endeavour Crater. The mound stands near the ...

This image shows rocky debris and dust, which planetary scientists call "regolith" or "soil," that has been churned up by the rover wheels.

The cruise stage provides power, communication and propulsion for the rover and lander within its cocoon made up of the heatshield and backshell for the cruise to Mars.

As part of its investigation of "Victoria Crater," Opportunity examined a promontory called "Cape Verde" from the vantage point of "Cape St. Mary," the next promontory clockwise around the crater's...

NASA's Mars Rover Opportunity catches its own late-afternoon shadow in this dramatically lit view eastward across Endeavour Crater on Mars.

This set of images from NASA’s Mars Reconnaissance Orbiter shows a fierce dust storm is kicking up on Mars, with rovers on the surface indicated as icons.

A round of applause at NASA's Jet Propulsion Laboratory in Pasadena, California, for a successful end to the mission of NASA's Opportunity Mars rover on Feb. 13, 2019.

NASA's Mars Exploration Rover Opportunity has been on the western rim of Endeavour Crater in Meridiani Planum for about two years. Until May 2013, it was investigating sedimentary layers that are ...

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 blink comparison aids evaluation of a drive by NASA's Mars Exploration Rover Spirit during the rover's 2,099th Martian day, or sol (Nov. 28, 2009).

The first episode documents the hurdles leading up to both launches. From Mother Nature being uncooperative to a problem with the cork insulation on the rocket, lift-off was no small feat. Ultimate...

Opportunity used its panoramic camera (Pancam) to acquire this view of "Solander Poin." The southward-looking scene, presented in false color, shows Solander Point on the center horizon, "Botany Ba...

This artist's concept animation depicts key events in NASA's Mars Exploration Rover mission, including launch; cruise; entry, descent & landing; egress; and, surface operations.

Opportunity captured this view of "Burns Cliff" after driving right to the base of this southeastern portion of the inner wall of "Endurance Crater."

NASA's Mars Exploration Rover Opportunity has been working on Mars since landing inside Eagle Crater on Jan. 25, 2004 (Universal Time; evening of Jan. 24, Pacific Standard Time).

This false-color view 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 view from the Mars Exploration Rover Opportunity's panoramic camera is a false-color composite rendering of the first seven holes that the rover's rock abrasion tool dug on the inner slope of ...

On March 20, 2004, NASA's Mars Exploration Rover Opportunity used a wheel to dig a trench revealing subsurface material beside the lander hardware that carried the rover to the surface of Mars 55 M...

Download a PDF of the 2015 - 2016 Mars Calendar.

Near the lower left corner of this view is the three-petal lander platform that NASA's Mars Exploration Rover Spirit drove off in January 2004.

This Aug. 15, 2014, scene from the Pancam on NASA's Mars Exploration Rover Opportunity looks back toward part of the west rim of Endeavour Crater that the rover drove along, heading southward, duri...

In February 2015, NASA's Mars Exploration Rover Opportunity is approaching a cumulative driving distance on Mars equal to the length of a marathon race. This map shows the rover's position relative...

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

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...

Download a PDF of the Explore Mars Sticker.