Is there a real chance that there is a multiverse?

[Mister Agenda]

I didn't claim to put forward an answer to the OP. The fine-tuning argument is a good one, and can't be directly refuted. It is true that our universe just so happens to have the right conditions that allow life to exist, and we have not observed any other universes, therefore it would be remarkable if our universe is indeed unique. With that said, I don't think a lack of scientific knowledge in this area is proof enough that our universe is unique and is designed.

Heh, I was talking to our weird friend Arkilogue, not you Aractus
But I still agree with your assessment. I also believe that fine tuning is present and not a figment of the imagination. I don't buy at all the arguments just waving it away like "look at all the empty space, it's hostile, and we don't know how life could otherwise look, and there's only one universe so the concept is meaningless, etc etc.. and I'm annoyed by them. To me it's clear from the physics that by tinkering just a bit with the parameters of the universe, you get one where there are no stars in the best case, and nothing approaching higher order structures in the worst case.

And you know the parameters of the universe can be tinkered with how? Not disputing, but I thought it was as yet unknown whether the cosmological constants could have been different from what they are.