Big Bang
The Big Bang theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution.
The model accounts for the fact that the universe expanded from a very high density and high temperature state, and offers a comprehensive explanation for a broad range of phenomena, including the abundance of light elements, the cosmic microwave background, large scale structure and Hubble's Law.
According to the Big Bang model, the universe expanded from an extremely dense and hot state and continues to expand.
History of the Universe - gravitational waves are hypothesized to arise from cosmic inflation, an expansion just after the Big Bang.
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