Termini of infinity

We are living on a planet that is somewhere called Universe - at least we think so but who can be sure.
And this place is supposed to be really big - some says it is so huge it has no end.
But is not this a really hard concept for our brain to absorb?
On the other hand, can you imagine that there would be some end of our Universe?
What would be on the other sideof this end? If nothing, how does this nothingness look?

Lets talk about this issue and practise our little grey cells, shall we?