alt Hacker NewsIt also answers not much, just changes the question. There's no known reason for all the matter to be over here, where we are, and all of the antimatter to be way over _there_ outside of the observable universe. If anything that seems much less likely than there just being other imbalances in which gets created (or which survives over time, etc.). The universe would have to have preferred absolute directions in which to throw different types of matter/antimatter? That'd be very strange indeed, based on what we know.
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>There's no known reason for all the matter to be over here
The problem is there is no known reason for universe to exist. As such it could have been created in any configuration possible - including one where we observe matter, but antimatter is beyond event horizon.
Not necessarily—perhaps it’s something like what we have right now is the residue of a slight variation from 50/50 in our local part of the universe (so it might have been 50.01% matter, 49.99% antimatter, and after the bulk of the matter and antimatter interacted and destroyed each other, the observable universe is that .02% left over. Do we know enough to be able to search for evidence of this in the cosmic background radiation?