Mercury's perihelion slowly precesses around the Sun by a bit less than 2° per century.This precession can be fully accounted for by Newton's theory of gravity,although general relativity also gives the same answer.

Question

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Newton's theory of gravity cannot fully account for the precession of Mercury's perihelion. General relativity provides the explanation for the additional precession not explained by Newtonian mechanics.

Mercury's Perihelion Slowly Precesses Around the Sun by a Bit