MAXWELL'S equations are well established for phenomena on laboratory and terrestrial scales, but there are other electrodynamic theories, as yet indistinguishable on such scales from Maxwell's theory, that have significantly different consequences for phenomena on an astronomical scale. For example, extensive magnetic fields are possible in the Universe1 because of the general absence of magnetic monopoles. Parker1 considered the abundance of magnetic monopoles that would neutralise or dissipate the magnetic fields of the Earth, Sun and the Galaxy, and deduced for the number density of free magnetic monopoles upper limits that are more stringent than those deduced from laboratory and terrestrial data.
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BYRNE, J., BURMAN, R. Of fundamental electrodynamics and astrophysics. Nature 253, 27 (1975). https://doi.org/10.1038/253027a0
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