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No, gravity for microscopic purposes may as well not exist. Surface tension matters for very small creatures.

Silicon is basically impossible as a building block for life. It forms bonds that are too strong, meaning it requires much more energy to fuel life processes and reducing the rate of chance collisions which lowers the prospects for abiogenesis.

Carbon is the only realistic choice; it is the only element abundant enough with the right balance of stability and versatility.




I guess I was thinking more about pressure than gravity (though the two are related). At extremely high or extremely low pressure, I would imagine things to play out differently


I think that in most situations the pressure would still not change much as far as atom-to-atom distances go. And in those situations, carbon is still smaller and workable.




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