Question

what happened if big bang theory dint start?​

Answer 1

Answer:

If Big Bang doesn't start there would be no universe.

Answer 2

Explanation:

What caused the Big Bang itself? For many years, cosmologists have relied on the idea that the universe formed spontaneously, that the Big Bang was the result of quantum fluctuations in which the Universe came into existence from nothing. That's plausible, given what we know about quantum mechanics.

No one knows exactly what was happening in the universe until 1 second after the Big Bang, when the universe cooled off enough for protons and neutrons to collide and stick together. Many scientists do think that the universe went through a process of exponential expansion called inflation during that first second.