As I understand it, if Hubble was turned on the Earth in a geo-stationary orbit it would struggle to pick out a couple of tanks on the ground. So how large would a telescopic satellite need to be (geo-stationary) to pick out a nickel on the ground? Is it even technically possible? I gather the size and weight would make it at least financially infeasible? Furthermore, are there technologies in the pipeline that could make it more technologically and financially feasible in the future? I.E. Improvements in optical technology that could make it much smaller and/or lighter. I understand drone aircraft would be the better option, but this is not what I'm asking. Many thanks.