It is a fact that we could launch light sails, and even heat up Mars a bit. The idea might be silly, but at least it is thinking big. Some other big idea will be better, including several of those listed after the light-sails bit.
The earth-sized radio telescope made out of Starlink transceivers is an obvious winner. Total coverage ground radar using the transceiver antenna is another.
The earth-sized radio telescope made out of Starlink transceivers is an obvious winner. Total coverage ground radar using the transceiver antenna is another.