Deprnds what center you are talking about. But, I am pretty sure that you are talking of the Galactic Core. If you make it and enter the core you will find Steve, who will talk to you about how you will bring the Galaxy to unite, how he is awesome, and will offer you a lovely timeshare opp. He will then award you with the Staff of Life which can instantly terraform any planet to T3 in an instant. After this you will end up outside the core, and will find that you cannot enter it again.