Strike a bell, and it rings with a pitch and a fading that tell you about the bell: its size, its shape, the metal it is made of. Black holes ring too. When two merge, the newborn black hole shivers and sheds gravitational waves in a brief, dying chord, and since 2015, gravitational-wave detect...

Source: [Phys.org](https://phys.org/news/2026-09-higher-dimensional-black-holes-exact.html)

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