Front wheel on Mars rover stops

One of the wheels on Nasa's Martian rover Spirit has stopped working.

The robotic vehicle is now dragging the wheel as it moves to a slope where it can get maximum sunshine on its solar cells to sustain it through the winter. Spirit's right-front wheel has played up before because of a lubrication problem, but engineers on Earth were able to return it to normal operation.

This time, however, it appears to be the motor that rotates the wheel that has ceased to function.

Only part of the text from this article have been posted -- read more @ BBC Science News.