Is it possible for an antimatter universe to exist?
by 
Chris Hansen
ANSWERS: 1
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Yes, antimatter is just as stable as normal matter. It would form the same atoms and compounds, with the same properties as it's normal counterparts (just with anti-protons and positrons... which no one would notice because everything else would be made of them too.) Now that's in theory. Could there ACTUALLY be an antimatter universe?? Well, that depends on whether or not there are other universes. If a multiverse, like M-theory suggests, turns out to exist, then it's almost certain (in my opinion). But even if not... normal matter only outpaced antimatter by a VASTLY small ratio at the Big Bang (think decimal point with a TON of zeros after it). So, there's no reason to assume that it ALL must have annihilated with normal matter at the outset. There could very well be whole galaxies of antimatter out there in the far reaches of space... that would look IDENTICAL to regular galaxies... until the first astronaut goes there and POOF!! :) Kinda neat to think about really.
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