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From BBC News | Science & Environment | UK Edition:
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.
The rovers' data has revealed much about the history of water at Mars' equator billions of years ago.
Artist's impression of a Mars rover (Nasa)
"These rovers are incredibly resilient considering the extreme environment the hardware experiences every day," said John Callas, project manager for Spirit and Opportunity at Nasa's Jet Propulsion laboratory in Pasadena, California.
"We realise that a major rover component on either vehicle could fail at any time and end a mission with no advance notice, but on the other hand, we could accomplish the equivalent duration of four more prime missions on each rover in the year ahead."
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