Are Space Probes on completed Galaxies returned to the players supply?
Yes. They are scored and removed to the each players supply/inventory so that they can be used again on a later turn. (Note: Space Stations are a different matter. When a Station is completely surrounded by tiles, a player has the option to score the Station immediately and then remove it to inventory for later use, or leave it as a docking station for one of his own Space Ships to use.
