Rover team members Kim Lichtenberg and Joseph Carsten watch motions of a test rover at NASA's Jet Propulsion
Laboratory, Pasadena, Calif., as the rover carries out commands for
driving forward with an arc toward the right. The experiment was designed
to assess whether this maneuver could pivot the rover around the immobile
right-front wheel, since the right-front wheel on NASA's rover Spirit has
been inoperable for more than three years.
This work on July 15, 2009, was part of a series of tests at JPL designed
to determine the best way to get Spirit out of a Martian patch of soft
soil called "Troy," where Spirit's wheels have dug in. The test setup, in
a box that team members are calling the dustbin, simulates the situation
at Troy. The box holds about 2.7 tons of a powdery mixture of diatomaceous
earth and fire clay. This material has physical properties similar to the
soil at Troy. The top surface is sloped at 10 degrees.
To see updates on the efforts to free the Spirit rover, visit the JPL
Free Spirit website.