A lot of AI put a Quantum Reactor on bases which is dumb (already endless), but also on some sats which could be clever for resupply, IF the sat was the Sensor Satellite, AND IF the AI was smart enough to drop them one per system cloaked in uncolonized systems, AND IF the Resupply Minister was smart enough to use them by combining the sat with a fleet needing resupply for one turn, AND IF also smart enough to remove the sat from the fleet next turn so that it could move onward. But the AI is not that smart, so just do it if you are a human. Quantum reactors are expensive if put on more than one or two ship designs. Sensor Satellites are no maintenance and cheap and needed anyway. Bases are expensive and require a base yard ship to build them remotely and pay maintenance....