The sage of six paths sealed the remaining part of the Juubi and formed the moon. I'm guessing he did it in a planetary Devastation kinda way. If that were the case then the Gedo Statue should have been the Core of the moon.
When Madara Stole the Gedo Statue, Shouldn't that have upset the equilibrium at the Core? (Considering just how large the gedo Statue is). I'm trying to understand this cause assuming the Juubi was sealed into forming the moon then wouldn't releasing the Juubi also mean undoing the seal, thereby causing the the moon to like, fall or something?