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Almost everyone has heard the story of the Big Bang, but if you ask somebody, from a layman to a cosmologist, to finish the sentence: "In the beginning there were …" They will get a number of different answers One of the most common is "a singularity" that refers to one At that moment all the matter and energy in the Universe focused on one single point: the Temperatures, densities, and energies of the universe would be arbitrary, infinite, and could even coincide with the birth of space and time.
But this image is not only wrong, it is almost 40 years old! Surely there was no singularity associated with the hot big bang, and maybe there was no birth at all in space and time. Here's what we know and how we know it.