Question

what do you understand by big bang theory? What was the composition of the universe after big bang​

Answer 1

Explanation:

the Big Bang was an explosion that created the whole universe .about 14 billion years ago the universe exploded out words from hot dense bubble that was smaller than a pinhead .the universe quickly grow larger than a Galaxy and kept on expanding .as it slowly cool down tiny particles within it joined and began to form stars and planets.