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Far beyond nuclear distances it behaves as a magnetically-charged pole of the Dirac type. In effect, the sequence of events during the earliest moment of the universe had been fossilized inside the magnetic monopole. Figure 08 Monopole Structure in GUT [view large image] One of the successes with the inflation theory was that it solved this so-called "monopole problem": monopoles would be exponentially diluted during the inflation, to such an extent that there would be little chance of even one in the Milky Way. By the way, skeptics about exotic physics might not be hugely impressed by a theoretical argument to explain the absence of particles that are themselves only hypothetic. Meanwhile in 1995 the MACRO (Monopole, Astrophysics, and Cosmic Ray Observatory.