Does the flat earth society even try to put together a theory regarding the creation of our universe? Or is just, gravity is wrong, heliocentric model is wrong, but the big bang is right?
You can't be a flat Earther if you believe the Big bang is right.
Is there any proof that anything floats in a vacuum?
The fact that we don't have proof anything floats on vacuum, is a proof that buoyancy is a product of downward force of gravity.
Big bang actually doesn't account for shapes of planets, how they were formed or anything.
Knowing how farm a wheat doesn't mean you know how to make bread with the wheat.