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4 billion years ago there was nothing; then everything exploded into existence and the universe was born, but a new generation of cosmologists are questioning this theory. Cosmologists have created a replica of the universe by using equations; it's called the standard model of cosmology and it's the reason behind the Big Bang theory; however, this model is now doubted. Professor Alan Guth's theory challenges the Big Bang by stating that the universe started out small, allowing the temperature to even out everywhere, before expanding on a massive scale.

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12y ago

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