The Big Bang Theory predicts that equal amounts of matter and antimatter were created in the Big Bang, however matter now appears to dominate our Universe to an extent that is not well explained by theory. It is possible that large amounts of antimatter could exist in separate domains that do not come in contact with matter. The detection of a Z > 1 antimatter particle would provide strong evidence of these domains because the probability of their production via interactions of CR with the ISM is negligible.
