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The BIg Bang Theory
Scientists believe that the universe started as a very, very, very small dot. The one dot was called a singularity, it had a large mass, small volume, and high density.
This singularity became unstable, causing it to explode 14 billion years ago, with a big bang. All of the matter and energy exploded outward from this small dot spreading gas and dust throughout space.
5 billion years ago the cloud of dust shrank to form a spinning disk (called planetoids).
The early solar system had lots of debris floating around. With every collision, the planetoids got bigger.
In part of the disc, the gas became hot and dense enough to form the sun.
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