As Mathano is meant to be a training galaxy it is very unfortunate that there is no single unexplored planet left. I’m having a hard time trying to understand how a new player could possible learn how to play the game when your actions are so limited and starting resources so high. I doubt any new players will like the experience of playing in Mathano after they realize all they can do is overbuilding their one and only planet. It would likely be better if not the top 20 were removed every now and then but every player being allowed to stay for no longer than 10 days (which should be enough to explore a huge number of planets and try out new economic strategies).
A fix is planned, hopefully soon. It will likely be based on a planet cap instead of a time cap.
This has been addressed; feel free to continue the discussion below: