NASA: Mars Exploration Rover Mission
NASA’s Mars Rover Opportunity has arrived at the rim of a crater approximately five times wider than a previous stadium-sized one it studied for half a year.
Initial images from the rover’s first overlook after a 21-month journey to “Victoria Crater” show rugged walls with layers of exposed rock and a floor blanketed with dunes. The far wall is approximately 800 meters (one-half mile) from the rover. [Go here for more plus pics]