Cosmology is the study of the Universe in its largest dimensions and of its evolution. In the successful big bang model, the early Universe is hot and dense and cools down as it expands. The question of the status of the original singularity (the so-called big bang) from which space emerged is a central one. It may be studied through the gravitational waves that are produced immediately after the big bang, for example during an explosive phase of expansion, known as inflation, that follows immediately the big bang.
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