Abstract
It is shown that hitherto mysterious properties of spiral galaxies can be understood if they have massive halos composed of unseen material, the elements of which are in motion radially in-and-out from the galactic center to an outer boundary with a radius of at least 100 kpc. A similar more compact model explains the curious properties of the system of NGC 7603, and if extended still further can provide a gravitational model for quasars. The most interesting possibility is that unseen halos consist of magnetic monopoles, each monopole having a mass of the order of the Planck mass, (hc/2G)1/2=1.54×10−5 g, whereh is Planck's constant divided by 2π.
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