@b4c50e1b thanks! I have to wonder where all the radiation (or energy from annihilation) went too - would this spontaneously turn back in to quarks of either type? 

 @b4c50e1b how is it we know the universe is matter dominated, rather than having an equal amount of antimatter? Would we know if a star or galaxy we see is antimatter? Or if beyond our visible limit there is lots of antimatter?