this post was submitted on 23 Apr 2025
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[โ€“] [email protected] 9 points 3 weeks ago (1 children)

There's actually a great XKCD "What If?" post that covers this: https://what-if.xkcd.com/140/

[โ€“] [email protected] 1 points 3 days ago

And the juicier tl;dr bits (note that XKCD only dares consider an electron moon, not a whole sun):

The amount of energy in our electron Moon, it turns out, is about equal to the total mass and energy of the entire visible universe.

[..], the energy from all those electrons pushing on each other is so large that the gravitational pull wins, and our singularity would form a normal black hole. At least, "normal" in some sense; it would be a black hole as massive as the observable universe.

Would this black hole cause the universe to collapse? Hard to say.