Scientists at the Jet Propulsion Laboratory in Pasadena, California, are still excited about the missions of the twin rovers on Mars, despite glitches with one of them, Spirit.
Experts are now trying to determine whether the rover Opportunity spotted evidence of a mineral that typically forms in water, perhaps providing a clue as to whether the Martian surface was once a wetter place.
NASA is also planning to roll Opportunity onto the surface of the red planet as soon as early Saturday, less than a week after it landed.
Meanwhile, the computer repairs to Spirit continue. Experts think some of the balky responses from Spirit may be related to using up too much computer memory prior to landing. Despite the glitches, NASA doesn't think it'll detract from the useful lifetime of the rover.