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Loading contentA black hole between about 100 and 100,000 solar masses — the elusive middle range.
Intermediate-mass black holes would bridge stellar-mass and supermassive black holes, but firm examples have long been scarce. Candidates come from dense star clusters and from gravitational-wave mergers producing black holes of a few hundred solar masses.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
Direct detections of gravitational waves from compact-object mergers.