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 LemaƮtre. 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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