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They _do_ evaporate, but they also absorb CMB, and right now CMB > evaporation. Later, when CMB fully dissipated they can evaporate in practice.



> Later, when CMB fully dissipated

That's one of the most understated uses of "later" I've heard.


Hehe, true.


According to https://en.wikipedia.org/wiki/Timeline_of_the_far_future, that may be around 150 billion years from now.

Also, I have a hard time reading that page without a sense of existential dread.




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