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The Intermolecular Forces of Iron
An extremal black hole is an example of a black hole where the mass is being balanced by something else. In practice, we think that in practice, that's never going to happen. If I have two black holes and they're both positively charged, then the gravitational field is going to attract them together but repel them. And it turns out that it balances when you have what is called an extremal Black Hole.