The curvature of space-time, the basis of Einstein’s theory of Relativity – which called into doubt all Newton’s calculations – was first observed in 1919 by british astrophysicist Arthur Eddington during a total eclipse of the disc solar that allowed – thanks to Einstein’s calculations this time – to provide an explanation for the unexplained excess of the advance of Mercury’s perihelion. The theory has never been faulted since by all the increasingly sophisticated experiments that have been put in place to verify it.