A wide range of empirical evidence strongly favors the Big Bang event, which is now essentially universally accepted. In 1964 the CMB was discovered, which convinced many cosmologists that the competing steady-state model of cosmic evolution was falsified, since the Big Bang models predict a uniform background radiation caused by high temperatures and densities in the distant past. Extrapolating this cosmic expansion backwards in time using the known laws of physics, the models describe an increasingly concentrated cosmos preceded by a singularity in which space and time lose meaning (typically named " the Big Bang singularity"). However, physics currently lacks a widely accepted theory of quantum gravity that can successfully model the earliest conditions of the Big Bang.Ĭrucially, these models are compatible with the Hubble–Lemaître law-the observation that the farther away a galaxy is, the faster it is moving away from Earth. The overall uniformity of the Universe, known as the flatness problem, is explained through cosmic inflation: a sudden and very rapid expansion of space during the earliest moments. ![]() These models offer a comprehensive explanation for a broad range of observed phenomena, including the abundance of light elements, the cosmic microwave background (CMB) radiation, and large-scale structure. ![]() Various cosmological models of the Big Bang explain the evolution of the observable universe from the earliest known periods through its subsequent large-scale form. ![]() It was first proposed in 1927 by Roman Catholic priest and physicist Georges Lemaître. The Big Bang event is a physical theory that describes how the universe expanded from an initial state of high density and temperature.
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