| बिग बैंग परिकल्पना क्या है ?
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Big Bang is the name of that scientists who gave us the most common theory of universe from the very early stages to the present day.
The Big Bang theory is that when our universe is not at all existed. It states that when our earth was born it was too hot and dense. After billions of years our universe got expanded, cooled and less dense. It explains why the distant galaxies keeps moving away from us. It also explains that why the speed is proportional to the distance when the galaxies moves away from us. It also says that why the universe is made mostly with hydrogen and helium. It also says that why there is a cosmic microwave background.
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