Bold claim: a wobbling black hole provides a rare, compelling check on a century-old idea about spacetime. And this is exactly what a global team has observed in a dramatic cosmic outburst, offering fresh insight into how black holes twist space and launch powerful jets.
Star shredded, sky witnessed
The focus is AT2020afhd, a tidal disruption event in which a supermassive black hole tears apart a passing star. The resulting debris forms a bright disk, while jets of matter accelerate outward at speeds close to light. The researchers tracked rhythmic changes in radio and X-ray signals from the event. These signals repeated every 20 days and remained in sync, showing the disk and the jet were wobbling together. That synchronized wobble is the signature of Lense–Thirring precession—the twisting of spacetime caused by a spinning black hole.
Cardiff University physicist Dr. Cosimo Inserra called this the clearest evidence yet for Lense–Thirring precession. He explained that the behavior matches the long-predicted effect: a rotating black hole drags spacetime around it in a slow, spiraling motion. Beyond confirming the relativistic effect, the observations also shed light on how a black hole dismantles a star and what conditions exist inside a tidal disruption event.
Unusual signals, new insights
The radio signals from AT2020afhd stood out as unusual compared with similar events. Inserra noted the variations changed quickly rather than staying constant, and they couldn’t be explained by the usual energy flows around the black hole. This strengthened the team’s interpretation and opened a new avenue for studying black hole behavior. The changing signals were described as further confirmation of the dragging effect and as a promising tool for probing black hole spin and accretion.
How the analysis came together
To study the event, the team combined X-ray data from NASA’s Swift Observatory with radio measurements from the Very Large Array. They also used spectroscopy to examine the material near the black hole, revealing its structure and composition. Taken together, the evidence aligned with theoretical predictions that spacetime would be pulled into a wobble by the spinning hole.
A window into black hole mechanics
Inserra emphasized that the observation shows how extreme gravity shapes the environment around a rotating black hole. He compared the effect to a rotating object generating a field, noting that a black hole creates a gravitomagnetic pull that influences nearby stars and matter. He even described the detection as a reminder of the complex forces at work in deep space, highlighting the ongoing discovery potential as scientists continue to monitor these rare events.
The broader significance
This finding underscores how much of the universe remains to be understood as astronomers attain finer detail in their observations and encounter the many variations and flavors that nature has produced. It also completes a long arc in modern physics: a real-world confirmation of ideas first sketched by Einstein’s relativity, now illustrated through one of the cosmos’s most violent phenomena. The study appears in Science Advances.
About the author
Aamir is an experienced tech journalist who has written for Exhibit Magazine, Republic World, and PR Newswire. His work dives into how new innovations reshape industries, everyday life, and humanity’s future.
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