this post was submitted on 28 Sep 2025
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[โ€“] WorldsDumbestMan@lemmy.today 1 points 3 days ago (1 children)

If the well, event horrizon expands when a blackhole takes more mass, why can't we just figure out how much volume it is compressed into by measuring the event horrizon increase?

We know the matter that goes in is a certain size. Maybe we can deduce the total size it is compressed to? And the size the blackhole gains.

[โ€“] rtxn@lemmy.world 2 points 3 days ago* (last edited 3 days ago)

It's impossible to know based on the current understanding of particle physics. A black hole is formed when the inward gravitational force exceeds the outward neutron degeneracy pressure of a sufficiently massive object, which is what keeps neutrons from occupying the same space (not really, it's complicated). Beyond that, only conjecture exists with no evidence, and the information paradox makes it impossible to observe the space inside the event horizon.