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The_Big_Bang_Worksheet.docx - The Big Bang Theory How did...

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The Big Bang TheoryHow did everything begin in the Big Bang?If theuniverseis expanding, the next logical thought is that in the past it had to have been smaller. A point even.The time when the universe began is the explosion known as the Big Bang.Everything in the Universe was part of that explosion, although not in its current form.The Big Bang Theory
Timeline of the Big Bang and the expansion of the Universe.There is a great deal of evidence that theUniversestarted with a big bang. TheBig Bang theoryis the mostwidely accepted cosmological explanation of how theUniverseformed. Think about the expanding Universe,then reverse it. If we start at the present and go back into the past, the Universe gets smaller. What is the endresult of a contracting Universe? A point.According to the Big Bang theory, the Universe began about 13.7 billion years ago. Everything that is now inthe Universe was squeezed into a point. It was all in a single, hot, chaotic mass. Then an enormous explosion—a big bang—took place. The big bang caused the Universe to start expanding rapidly. All the matter andenergy,even space itself, came out of this explosion (Figureabove).

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Dark Matter, Big Bang, Physical cosmology, Cosmic microwave background radiation

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