Nasa bid to contact Mars rover
The Mars rover Spirit has marked its seventh year on the red planet.
Not only is it stuck in a sand trap, it hasn't communicated with Earth since March.
Nasa does not know whether Spirit is dead, but the space agency is diligently listening for it.
A pair of Mars orbiters has been making daily overhead passes hoping for a signal from Spirit, which became mired in sand in April 2009.
Meanwhile, its twin, Opportunity, is exploring a 300-foot-diameter crater and will move onto another target in several months.