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.
We aren’t talking about ‘planets’, we are talking about Earth. The one place we know that humans live. Which is a flat plane. We are not spinning through space. The sun and moon are small local lights.
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