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.

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 &lt;p&gt;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.&lt;/p&gt;&lt;p&gt;The story &lt;a href="https://www.quantamagazine.org/astrophysicists-find-no-hair-on-black-holes-20250827/"&gt;&lt;strong&gt;Astrophysicists Find No ‘Hair’ on Black Holes&lt;/strong&gt;&lt;/a&gt; first appeared on Quanta Magazine.&lt;/p&gt;
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Hundreds of signals from colliding black holes over the past decade show that if black holes are sporting quantum “hair," it must be very short.

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.

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Audio Edition: Astrophysicists Find No ‘Hair’ on Black Holes

Audio Edition: Astrophysicists Find No ‘Hair’ on Black Holes

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