The Big Bang theory is the major scientific theory about the origin of the universe. According to this theory, the universe was created between 10 billion and 20 billion years ago from a cosmic explosion that sent matter flying in all directions, consequently creating the universe. Before the Big Bang, every part of the universe was tightly compacted together during a very dense phase. When the explosion occurred, every particle of all that our universe consists of shot out in every direction in that one instant. It is believed that the universe expanded rapidly in its first microseconds, but then slowed, a process called inflation. This process explains how the universe appears similar to a type of flat space. However, we see only a tiny region of the original universe, so we don 't notice the curvature. The inflationary universe also shows why
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