When Gravity Breaks Down

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In Newton's view, all objects attract each other through a universal law of gravitation, which effectively predicts planetary motion and is still used in rocket launch calculations. However, it struggles with anomalies like Mercury's orbit. Einstein proposed that gravity is an effect of space-time curvature rather than a force, but General Relativity fails to explain phenomena near black holes and the behavior of stars in galaxies, leading to the introduction of dark matter. Mordehai Milgrom's MOND theory accurately describes stellar motion without dark matter, though it cannot eliminate the need for it entirely. Many theorists believe in the existence of gravitons as dark matter candidates, but unifying quantum theory with General Relativity remains unverified, raising doubts about gravity's nature. Quantum gravity aims to describe the microstructure of space-time, with string theory suggesting that particles are vibrations of tiny strings. However, the minuscule size of strings complicates experimental verification. Emergent gravity, describing gravity as an entropic force, has sparked debate but lacks testable predictions that deviate from General Relativity. A proposed fifth force combines MOND and emergent gravity into a single equation, addressing various gravitational issues but not explaining gravity's origin. This theory posits gravity arises from the Casimir effect due to vacuum polarizations, supported by experiment