Just prior to the big bang, which is a scientific theory of the creation of the universe, scientists estimate that space was essentially an empty vacuum. The big bang theory asserts that the universe was created as an incredibly hot and incredibly dense single point in space that then has expanded over billions of years. In the very first second of the Big Bang, scientists estimate that the universe immediately began doubling in size of at least 90 times its initial size upon creation. During this initial burst of growth, known as inflation, the universe began to cool and become less dense. It was during this process that the universe began to form measurable matter. Light chemical elements were created as some of the initial matter to form. Protons and neutrons were colliding to create the isotopes that later formed hydrogen and helium.
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