Simple Description

A theory about how the universe started.

Further Detail

The Big Bang Theory states that the universe started as a small, incredibly dense point and then exploded around 14 billion years ago. It has been expending ever since. The two main forms of evidence for the Big Bang Theory are the observation of red shift from moving stars and the existence of cosmic microwave background radiation (CMBR).

Related Words:

• CMBR
• Cosmic Microwave Background Radiation
• Red shift
• Universe

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