Big Bang

What is Big Bang?

Big Bang definition and meaning on Science terms:
A widely accepted model of the Universe that assumes that the observed expansion of the Universe originated about 13.7 billion years ago, when the Universe was very hot and very dense. It successfully explains the cosmic microwave background and the ratio of hydrogen, helium, and other light elements, as well as the expansion of the Universe.

 

reference: https://imagine.gsfc.nasa.gov/resources/dictionary.html

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