Humphrey on the Inside

Engineers for NASA's Mars Exploration Rover Mission are completing assembly and testing for the twin robotic geologists at JPL.

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...

Artist's concept of controlling the rover from Earth, scientists drive the rover along Mars' surface inspecting geological features.

NASA's Mars Exploration Rover Opportunity observed this outcrop on the "Murray Ridge" portion of the rim of Endeavour Crater as the rover approached the 10th anniversary of its landing on Mars.

NASA's Opportunity Mars rover, working on Mars since January 2004, passed marathon distance in total driving on March 24, 2015. This map shows the rover's entire traverse from landing to that point.

This is the Spirit panoramic camera's "Lookout" panorama, acquired on the rover's 410th to 413th martian days, or sols (Feb. 27 to Mar. 2, 2005).

This stereo anaglyph looking toward the northeast across "Endurance Crater" in Mars' Meridiani Planum region was assembled from frames taken by the navigation camera on NASA's Mars Exploration Rove...

These two thumbnail images, with the ghostly dot of a faint Sun near the middle of each, are the last images NASA's Opportunity rover took on Mars.

NASA's Mars Exploration Rover Opportunity is continuing its traverse southward on the western rim of Endeavour Crater during the fall of 2014, stopping to investigate targets of scientific interest...

Road trip! This compilation of images from hazard-avoidance cameras on NASA's Mars Exploration Rover Opportunity between January 2004 and April 2015 shows the rover's-eye-view of the Martian marath...

NASA's Mars Exploration Rover Opportunity drove about 12 feet (3.67 meters) on May 8, 2012, after spending 19 weeks working in one place while solar power was too low for driving during the Martian...

Scientists and engineers who worked on NASA’s Opportunity rover give mission leadership a round of applause in Mission Control at NASA’s Jet Propulsion Laboratory in Pasadena, California.

NASA's Mars Exploration Rover Opportunity obtained this view from the top of the "Cape Tribulation" segment of the rim of Endeavour Crater. The rover reached this point three weeks before the 11th ...

On the horizon in the right half of this panoramic view is an area of Mars informally named "Matijevic Hill," in commemoration of an influential rover-team leader.

Find out how the Mars Exploration Rover team traversed the Red Planet, examined the diverse environment and transformed our understanding of Mars.

NASA's Mars Exploration Rover Opportunity has extended its robotic arm for studying a light-toned rock target called "Athens" in this March 25, 2015, image from the rover's front hazard avoidance c...

This close-up image taken by Spirit highlights the nodular nuggets that cover the rock dubbed "Pot of Gold."

This synthetic image of NASA's Opportunity Mars Exploration Rover inside Endurance Crater was produced using "Virtual Presence in Space" technology.

"Marathon Valley" on Mars opens to a view across Endeavour Crater in this scene from the Pancam of NASA's Mars rover Opportunity. The scene merges many exposures taken during April and May 2016. Th...

Scientists and engineers working on NASA’s Mars Exploration Rover mission gather for a team portrait during the rovers’ prime mission on Mars in 2004 at NASA’s Jet Propulsion Laboratory in Pasadena...

NASA's Mars Exploration Rover Spirit captured this westward view from atop a low plateau where Sprit spent the closing months of 2007.

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.

NASA's Mars Exploration Rover Spirit has this view northward from the position at the north edge of the "Home Plate" plateau where the rover will spend its third Martian winter.

This beautiful scene reveals a tremendous amount of detail in Spirit's surroundings at a place called "Winter Haven," where the rover spent many months parked on a north-facing slope in order to ke...

The yellow line on this map shows where NASA's Mars Rover Opportunity has driven from the place where it landed in January 2004 -- inside Eagle crater, at the upper left end of the track -- to a po...