I can't believe its been five years since the landing of the Mars Rovers. Its amazing that they have survived 5 years when their missions were only to last 6 months.
From Steve Squyres of Cornell University, in Ithaca, N.Y. Squyres is principal investigator for the rover science instruments:
"The journeys have been motivated by science, but have led to something else important. This has turned into humanity's first overland expedition on another planet. When people look back on this period of Mars exploration decades from now, Spirit and Opportunity may be considered most significant not for the science they accomplished, but for the first time we truly went exploring across the surface of Mars."