@CygnusX1 I agree, but I'm pretty sure he has considered the possibilities that you mentioned, and incorporates all possibilities in the word "cosmos." I actually got his book Cosmos for my birthday. It is amazing, and I read these exact lines on one of his pages.
@curtis Absolutely, I'm sure by now you've already seen it since it just recently aired?
@CygnusX1 Thank you for your thoughts, as they're definitely good questions. I wonder if by the cosmos, he means, everything, all of it. I'm not sure how to put it. I think the idea of multiple verses is fascinating.
While I like Sagan...his conclusion is a bit of a stretch. ..he doesn't KNOW this is all there is...he THINKS this is all there is.
Are there other universes? Other dimensions? Maybe...