Would a very heterogeneous planet be spherical?
I have a planet with homogeneous core and mantle, but a thick crust separated in two parts: the north half is composed of water and the south part is an alloy of heavy metals, making the north lighter than the south.
What would be consequences on planet shape? The usual - not perfect - spherical form is generated because of gravity, but here, the gravity center would be slightly offbeat because of surface height heavier on a side compared to another.
I know that an effect (if any) would be very slight considering the implication of the crust in global planet weight, but I'm still curious of details.
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