The Opportunity rover landed near this large crater and drove to the edge to take a look at the rocks inside. (It was easier than digging!) They learned that water probably used to fill it. Meanwhile, the Mars Reconnaissance Orbiter aimed its telescope at the same crater as it sped by overhead, and was just able to get a picture
of the rover on the surface! The shadow of its camera mast is especially clear.
Credit: NASA/JPL/Cornell/University of Arizona