![]() ![]() 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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