Opportunity Spies Endeavour

NASA's Mars rover Opportunity has photographed its ultimate goal-- Endeavour Crater. The crater walls are visible jutting up from the surrounding plain.

Endeavour, at 14 miles in diameter, would be the largest crater yet visited by the rover. Reaching it, however, is far from a sure thing. Opportunity is still seven miles away. That trip could take two more Earth years. Getting there would mean Opportunity, built to last 90 days on the surface, would have operated on Mars for seven years.