The rovers and probes in space are controlled by people here on Earth. Can anyone explain to me how this system works and how they can get signals from earth to the probes/rovers on Mars in a timely manner and still be able to control the experiment or do they just take it one step at a time and have to wait a long time for the data to get to the rover/probes. Also how fast can probes get pictures and information back to Earth. Especially like Cassini and the ones that are out towards Pluto now? Thanks in advance.