An investigation of a cosmic experimentIn 1851, the physicist Léon Foucault performed an unforgettable experiment. By suspending a large pendulum inside the dome of Paris’ Pantheon, Foucault provided the first simple, direct empirical evidence of the Earth's rotation—an undeniable demonstration of heliocentrism. This experiment, conducted long after the Copernican Revolution and using a laboratory apparatus rather than astronomical observation, visually confirmed w...