Two Impossible Black Holes Just Crashed Into Each Other
•March 11, 2026
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Why It Matters
GW231123 proves that black holes can exist where theory said they could not, forcing a revision of formation models and expanding the landscape of sources for next‑generation gravitational‑wave detectors.
Key Takeaways
- •LIGO detected GW231123, a merger within the black‑hole mass gap.
- •Merged black holes weighed 103 and 137 solar masses, near light‑speed spin.
- •Event released energy equivalent to 15 solar masses via gravitational waves.
- •Simulations show magnetic fields in star collapse produce fast‑spinning gap black holes.
- •Findings overturn prior theories, prompting new models for intermediate‑mass black holes.
Summary
The video examines the groundbreaking LIGO detection of GW231123, a gravitational‑wave signal from two black holes that lie squarely inside the long‑standing “mass gap.” Occurring roughly 7 billion light‑years away, the event was captured on November 23, 2023 and immediately stood out as a ten‑second‑long, unusually loud blip that survived rigorous noise‑rejection tests.
Analysis of the waveform revealed the progenitor black holes to be about 103 and 137 times the Sun’s mass, each spinning at nearly the speed of light. Their merger produced a single remnant of 182‑251 solar masses and radiated the equivalent of 15 solar masses in pure gravitational‑wave energy—roughly 3 × 10⁴⁸ J, outshining all stellar output in the observable universe at that moment. The signal was dominated by the “ringdown” phase, allowing scientists to extract precise mass and spin parameters.
The discovery challenges conventional stellar‑evolution models, which predict a dearth of black holes between 50 and 130 solar masses. Researchers at the Flatiron Institute propose that strong magnetic fields in the collapsing cores of massive stars can both limit mass loss and impart rapid spin, creating gap‑mass black holes without requiring hierarchical mergers. Simulations demonstrated that magnetically driven jets can eject up to half the progenitor’s mass while delivering a natal kick that preserves binary binding.
If confirmed, these mechanisms will reshape our understanding of black‑hole formation pathways, expand the catalog of detectable intermediate‑mass mergers, and refine predictions for future gravitational‑wave observatories. The event underscores LIGO’s growing sensitivity and its role in probing physics beyond standard stellar‑collapse theory.
Original Description
Scientists detected a black hole signal that should be impossible.
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In 2023, LIGO spotted a record-breaking signal that was initially dismissed as a glitch… until a second detector confirmed it. It wasn't just a regular black hole merger, like LIGO has seen before. This was a crash between two black holes that, according to our models, shouldn't exist at all.
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0:00 Colliding Black Holes
2:31 Gravitational Waves
4:07 LIGO
6:51 Impossible Signal
10:53 Impossible Black Holes
12:55 GW231123
14:55 Black Hole Magnetic Fields
17:29 Magnetic Explosions
18:59 Future Signals
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References:
“Scientists Found a Black Hole That Shouldn’t Exist”, via popularmechanics.com https://astrumspace.info/impossible_bh
“Most Massive Black Hole Merger to Date”, via ligo.caltech.edu https://astrumspace.info/massivemerger
“Direct-horizon Collapse as the Origin of GW231123”, via iopscience.iop.org https://astrumspace.info/directcollapse
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Credits:
Writer: Clementine Cheetham
Video Editor: Eduardo Solórzano
Researcher: Shourya Shrivastava
Script Editor: Damaris McColgan
Thumbnail Designer: Peter Sheppard
Publishing Lead: Georgina Brenner
Production Manager: Raquel Taylor
Edit Producer: Poppy Pinnock
Head of Astrum: Jess Jordan
Creator of Astrum: Alex McColgan
With special thanks to:
NASA/ESO/ESA/LIGO
#Astrum #Space #BlackHoles
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