Origin of Life-Evolution[Hindi]

Origin of Earth
Earth is presumed to be originated 4.5 billion years ago either as a part broken of the sun or by gradual condensation of nebulous residue of gas and the dust surrounding the sun. Different theories were proposed by different scientists as given below
Big-bang Hypothesis - given by Abbe Lemaitre. According to him

A vast, dense, red hot and rotating gaseous cloud of cosmic dust, collide together and gave rise to atoms of hydrogen.
The atoms of hydrogen fused into heavier atoms of different elements.
The original gaseous cloud spread out into space and divided into larger and smaller masses, forming stellar systems and stars.
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