Rover-team members at NASA's Jet Propulsion Laboratory, Pasadena, Calif., check slight movements by a test rover during tests simulating the challenge of getting NASA's Mars Exploration Rover Spirit out of a sand trap on Mars.

Rover-team members at NASA's Jet Propulsion Laboratory, Pasadena, Calif., check slight movements by a test rover during tests simulating the challenge of getting NASA's Mars Exploration Rover Spirit out of a sand trap on Mars. From left: Alfonso Herrera, Matt Van Kirk, Mike Seibert, Brenda Franklin.

To see updates on the efforts to free the Spirit rover, visit the JPL Free Spirit website.

View all Images