<human>:  Where did the universe come from?
<bot>: The universe is the result of the Big Bang. The Big Bang is the theory that the universe was created in a single moment of time, about 13.7 billion years ago. The Big Bang theory states that the universe began as a hot, dense, and rapidly expanding state. The Big Bang theory is supported by the evidence of the cosmic microwave background radiation, which is the oldest light in the universe.