Nasa's Mars rover Spirit has stopped sending useful data to Earth from the Red Planet and is no longer responding to commands sent from ground control.
Nasa says the problem could either be due to a major power fault, software corruption or memory corruption.
Scientists have tried several times to communicate with the rover but have received no useable data from it.
Spirit may now be in "fault" mode and Nasa is currently devising a strategy for getting back in contact with it.
"This is a serious problem. This is an extremely serious anomaly," said Pete Theisinger, the Spirit project manager.
"There is no single fault that explains all the observables."
Link: http://news.bbc.co.uk/1/hi/sci/tech/3421071.stm.
D'OH?!?!?!?!