BBC NEWS | Technology | Mars rovers roll on to five years
The US space agency's (Nasa) Mars rovers are celebrating a remarkable five years on the Red Planet.
The first robot, named Spirit, landed on 3 January, 2004, followed by its twin, Opportunity, 21 days later.
It was hoped the robots would work for at least three months; but their longevity in the freezing Martian conditions has surprised everyone. (...)