The Mars rover Spirit has turned five years old, proving a longevity never thought possible when the probe first landed on the Red Planet on the 3es of January, 2004. Its sister rover, Opportunity, landed 3 weeks later.
NASA's John Callas said: "These rovers are incredibly resilient considering the extreme environment the hardware experiences every day. We realise that a major rover component on either vehicle could fail at any time and end a mission..."
The pair of rovers have revealed much about the history of water on Mars, including data sbout the Red Planet's equator billions of years ago. Spirit is currently exploring the Gusev crater, while Opportunity is in a flat region.