In this April 13, 2005 iimage provided by NASA's Jet Propulsion Laboratory shows a synthetic image of the Spirit Mars Exploration Rover on the flank of "Husband Hill" that was produced using "Virtual Presence in Space" technology. Five years after the NASA rover Spirit landed on Mars, the six-wheel robotic geologist and its twin, Opportunity, are still on the job.
March 29, 2011 6:27:11 AM PDT
By ALICIA CHANG, AP Science Writer
LOS ANGELES - March 29, 2011 --
The prospect of ever hearing from the stuck Mars rover Spirit is fading after it failed to respond to repeated calls from Earth.