The big bang theory is just a theory , right? How they know and claim that big bang hapened ? They don't. Universe is older than they think. Universe is larger than they think. And what scientists observe in visible universe ? Past . In any situation they observe past , there is no real time information . Even when they look at the sun they look what hapened 8 minutes ago.
Also humanity is here on this planet longer than they can imagine . What is background of my claims ? Common sense . In the end we are creators . My theory is that we are on this planet some kind of refugees . Escaped from somewhere and lost our knowledge thru ages . Extraterrestrial life is us somewhere on some distant planet.
"Just a theory" lol
A theory is the highest title, after an educated guess and a hypothesis.