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  • $\begingroup$ "If Electromagnetic forces didn't do this there would be only a galaxy-sized blob of Hydrogen and Helium nuclei" - Are you saying there wouldn't be stars? $\endgroup$
    – Keith McClary
    Commented Dec 21, 2020 at 21:56
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    $\begingroup$ You wouldn't have a galaxy-sized blob, you'd have stars orbited by "planets" that were blobs of gaseous iron, silicon, &c, just as we have bigger blobs of mostly hydrogen & helium, like Jupiter & Saturn. Indeed, there seems to be at least one exoplanet that comes close to being an iron gas giant: scientificamerican.com/article/… $\endgroup$
    – jamesqf
    Commented Dec 22, 2020 at 4:58
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    $\begingroup$ To forms stars you need to get a gravitational collapse going, That means converting gravitational energy to heat. That means some kind of friction or other diapation, but those processes are electromagnetic. Without it protons would behave like dark matter. On the other hand, they might just fuse via strong interactions. Anyway, you don't get a universe that is anything like ours if you take away electromagnetism $\endgroup$
    – James K
    Commented Dec 22, 2020 at 7:21