The greatest job on two planets
Guiding the rovers from millions of miles away takes skill, patience
...
...
The rover Spirit has a right front wheel that no longer can rotate on its axle and has to be driven around gingerly as it drags its broken wheel, Maxwell said.
"It's like driving a broken grocery cart by remote control from 100 million miles away," he said. "So it has its challenges."
Read the article about the Mars rover drivers at ComputerWorld.

