H/t MisHum (if you ignore the anti distancing pander/snark): the remote control aeroplane. Add to the battery and we are getting somewhere.
Here on Erf, this has just made redundant every would-be hijacker of a commercial flight. Sorry Zawahiri! Unless they are in league with a hacker on the ground... but, that will take more work.
Over Venus, I believe that communication is why we install our depots at L1 (especially) and L2. Energy beamers I'd considered, but abandoned.
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