I think the vastness of the universe is too great for the human mind (of today) to fathom. I like to think that it will go on and on, yet turn in on itself, so that you could travel in a straight line for an astronomic amount of time only to discover you have ended up on the place of departure, which wouldn't be there anymore, because by that time everything has changed
(My maths teacher would say this is impossible)
And by the way, Santa is absolutely real. He lives no more than 100 km from here on the Arctic Circle and you can come an visit him if you like