For the 5th time since landing on Mars, the remarkable Spirit and Opportunity rovers have had their mission time extended, possibly as far as 2009. It's an amazing achievement given that they were expected to last at best 90 days. Yet the two rovers have been hard at work since January 2004 and despite many problems, including dust on their solar panels and a dragging wheel on Spirit, they continue to return valuable scientific data. To date, Spirit has driven 7.26 kilometers (4.51 miles) and has returned more than 102,000 images. Opportunity has driven 11.57 kilometers (7.19 miles) and has returned more than 94,000 images.