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It's mostly theory, remember the world was flat once! I like to get my brain around things I can see, touch or calculate. 156 billion light years is one big number. Work out the distance in Kms to our nearest star (other than the sun) then work out how long it would take to drive there (Presuming we had a hyperspace bypass of course!!) . That's mind boggling enough for me. Still, great thinkers come up with great (and correct) theories, look at Einstein and Newton. As for nothing outside our universe, I doubt it; if you can detect 156 Billion light years worth of stuff I reckon it's highly unlikely that it just stops and ends in nothing; maybe we have just reached the limits of detectability.
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