this post was submitted on 28 Oct 2025
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Gravitational wave events hint at 'second-generation' black holes (phys.org)
submitted 2 weeks ago by RegularJoe@lemmy.world to c/science@lemmy.world
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[–] teft@piefed.social 5 points 2 weeks ago* (last edited 2 weeks ago)

We had seen merges of two first generation black holes but never of this type which would have had at least one other merger prior to this merger detected (either four merged into two merged into one or some other configuration like that). That’s what they mean by hierarchical mergers.