Since Schwarzchild Metric is a vacuum solution (hence won't work inside earth), what metric do we use to describe gravity inside earth? What are the conditions to derive it?
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Essentially a duplicate of https://physics.stackexchange.com/q/219897/2451 , https://physics.stackexchange.com/q/290058/2451 – Qmechanic Apr 13 '23 at 12:36