This started the formation of atoms, which eventually led to the formation of stars and galaxies. Then about 13.8 billion years ago, space expanded very quickly (thus the name "Big Bang"). The universe began as a very hot, small, and dense superforce (the mix of the four fundamental forces), with no stars, atoms, form, or structure (called a " singularity"). The Big Bang is the name that scientists use for the most common theory of the universe, from the very early stages to the present day. The Big Bang is a scientific theory about how the universe started, and then made the stars and galaxies we see today. The theory suggests, and measurements show, that the universe is still expanding today. The Big Bang model is that the universe begun in an extremely dense and hot condition and has expanded.
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