Final parsec problem
How do pairs of supermassive black holes get close enough to merge?
Summary
Theory predicts that two supermassive black holes a parsec apart may take longer than the age of the universe to merge, yet such black holes appear to have merged.
Source
Open, as listed by Wikipedia · Unsolved problems in astronomy. Checked 29 Sep 2026.
The status is the source’s. Papex does not decide whether a problem is solved.
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