I am still amazed - everyday - about the Rovers on Mars. It's a fantastic achievement of US scientists and manufacturers, and NASA. The whole is done very professional and I like also the coverage through Internet. We can see everyday what's happening with Spirit and Opportunity. http://marsrovers.jpl.nasa.gov/home/index.html Now the Marsrover Opportunity is almost at the rim of a large crater called Endurance (diameter: 200 meter). The crater is also deep so we will be able to see not just some surface geology. The images will be beautiful, I am sure. Some distance photo's show already several thick geologic layers. I think you should take a look. http://marsrovers.jpl.nasa.gov/gall...30a/1NN094EFF19CYL00P1829L000M1-B095R1_br.jpg.