Pions are the mediating particles of the strong nuclear interaction. The intensity of the interaction depends on the mass of the pions and that mass … - Isaac Asimov

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Pions are the mediating particles of the strong nuclear interaction. The intensity of the interaction depends on the mass of the pions and that mass can, under certain specialized conditions, be altered. The Lunar physicists have developed an instrument they call the Pionizer, which can be made to do jut such a thing. Once the pion's mass is decreased, or increased for that matter, it is, effectively, part of another Universe; it becomes a gateway, a crossing point.