Occam’s razor: cause they don’t exist! Gravity is a theory they needed to invent to make the fake ball conditioning work.
So name the phenomenon that makes heavier things displace lighter things.
And then tell my why that happens.
You sure like to avoid direct questions, much like liars and likes.
Density, buoyancy, the indisputable properties of mass and matter... I thought your question was rhetorical. Gravity IS a theory. Or have you proved it?
Right, it's a theory.
A testable and repeatable theory. We call it a force, and it radiates spherically from a center: hence, the only logical shape for planets is a sphere.
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