Question

if you can suggest three instances which proves big bang theory​

Answer 1

Answer:

Hundreds of thousands of years later, electrons stuck to the nuclei to make complete atoms. About a billion years after the Big Bang, gravity caused these atoms to gather in huge clouds of gas, forming collections of stars known as galaxies.

ANS OF YOUR QUESTION

The cosmic microwave background radiation.

The cosmic microwave background radiation.This is completely consistent with a fireball event in which the radiation field was in thermal equilibrium, and is perhaps the most convincing evidence for the Big Bang.

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