The Mars rover Opportunty, after spending two years in Victoria crater, is now more than halfway to the huge Endeavour crater. So far, it has taken Opportunity two years to cover six miles from Victoria.
Endeavour is particularly interesting to scientists because satellite images have shown it contains clays. Clays implies water, and water could support life. Endeavour is also a very old crater, dating from a time when Mars could have been more suitable for biology.
Though the Mars rovers are remarkable machines, six miles in two years is extremely slow. A manned expedition could cover that distance in one day.
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