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InfernalGriffon t1_izc59hj wrote

If a black hole composed of antimatter collided with a black hole made of matter what would happen next?

Also, could antimatter black holes be a possible answer for why there's so little observable antimatter in the universe?

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nivlark t1_izdqalj wrote

Nothing special: black holes are believed to obey something called the "no-hair theorem", which states they can be completely described by their mass, electric charge, and angular momentum. So there is no way to tell, at least from outside the event horizon, whether the black hole formed from matter or antimatter.

As to the second question, the mass in black holes that we know of is only a small fraction of the total mass. So there is no evidence for a large population of (ex-) antimatter black holes.

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