According to Einstein’s theory of gravity, black holes have only a small handful of distinguishing characteristics. Quantum theory implies they may have more. Now an experimental search finds that any of this extra ‘hair’ has to be pretty short.

The story <a href="https://www.quantamagazine.org/astrophysicists-find-no-hair-on-black-holes-20250827/">Astrophysicists Find No ‘Hair’ on Black Holes</a> first appeared on Quanta Magazine.

What Actually Causes Lightning?

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