Simple Description

Cosmic Microwave Background Radiation - One of the main sources of evidence for the Big Bang Theory.

Further Detail

When the universe was formed (around 14 billion years ago) it was extremely hot. As the universe expanded and cooled down the radiation from the Big Bang turned into microwave radiation, which exists in the universe and can be detected on the Earth.

Related Words:

• Red shift
• Big Bang Theory
• Microwaves

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