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Now, consider a particle of Hydrogen
The space is homogeneous for the purpose of this connundrumPick one.
Which bit of the shell theorem broke down and why?The assumption of homogeneity
At some point during the evolution of the cosmos, most planets were indeed smaller than a grain of salt. But the density of beta emitters was very small indeed.Planet means "wanderer" and at that stage, they didn't.
consider a tiny grain of an energetic beta emitter like Yttrium-90.I more or less did.
it might manage to boil itself.Once the thermal energy is enough to " overcome the binding energy of the delocalised electrons " you no longer have a lump.