Transponder control plant
The TCP is a large facility dedicated to the maintenance of the Planar Transponder Unit, a device capable of receiving signals from dimensions different than our own and automatically retransmitting a different signal in return.
This building has no effect besides working toward the scientific victory. It cannot be built if this victory condition is disabled. Like terraforming projects, it cannot be bought out, so it should be built on a planet with the highest production output.