Asked by: Pierce Brady, Cork, Ireland
It is a possibility. One of the greatest mysteries of modern physics is why the Universe is composed almost entirely of ordinary matter with only a tiny fraction of antimatter. The Big Bang should have produced the same amount of each. However, it has been suggested that different regions of the Universe could be dominated by one or the other, although how this might come about is also a mystery, and there is currently no evidence that this is the case.