chemical reactions occur spontaneously because they increase the entropy of the universe. but why does gravitation occur spontaneously? if anything, gravitation decreases the entropy of the universe.
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What you are hoping is the concept of entropic force but that is not yet accepted theory in physics. We consider gravitation as an effect of space-time curvature in 4 dimensions. – Proscionexium Feb 11 '24 at 11:11
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Thermodynamics might be incorporated in General Relativity, the theory of gravitation. But that is not fully achieved yet. – Proscionexium Feb 11 '24 at 11:14
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2Possible duplicates: https://physics.stackexchange.com/q/116608/2451 and links therein. – Qmechanic Feb 11 '24 at 11:19