Maxwell's equations, and General Relativity are theories, supported by statistical inference from countless experiments and experience. The inferences about the number of interstellar objects is much weaker, but not ridiculous. Until we have more evidence, and with the more sensitive sensors that should be available in the near future we will. In the meantime, we should to keep an open mind, agreed.
Heliocentricism, too, is "just" a theory.
Maxwell’s equations
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Are you referring to James Clerk Maxwell original field equations [ his 200 quaternions ] or to the vector equations conjured up by Oliver Heaviside?
Although aside from the Electric Universe theories, I fail to see what unified the theories of electricity and magnetism have to do with stellar body types ans number. An explanation on this point would be helpful.