Problem: Home systems for players who have yet to join the launched game appear as unnoccupied planets. Players claim them and then when the true owner joins, all the planets revert back to the planned owner and the squatter loses everything.

The current solution that we have in mind is to turn the planets invisible until the player joins. So your probe might fly through and nothing is there and then a few days later when you fly through there will be planets and a new player.

We don't see a downside to this solution, but comments are invited.