Using NASA’s Neil Gehrels Swift Observatory, researchers have observed a rare astronomical phenomenon: a supermassive black hole destroying a star in the outskirts of a distant galaxy. While tidal disruption events—the process where extreme gravity shreds a star—are known to occur, they are typically found at the centers of galaxies. This discovery marks one of the few confirmed instances of such an event happening far from a galactic core.

The event was initially detected in November 2025 by the Zwicky Transient Facility (ZTF) at the Palomar Observatory, which identified a bright flare in a galaxy located 750 million light-years away. An artificial intelligence algorithm flagged the flare, which briefly outshone its host galaxy with the intensity of 10 billion suns. Follow-up observations from the SOAR telescope in Chile and NASA’s Swift observatory confirmed the nature of the event, with Swift’s instruments measuring the flare's temperature at approximately 54,000 degrees Fahrenheit (30,000 degrees Celsius).

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Robert Stein, a research fellow at the University of Maryland and NASA’s Goddard Space Flight Center, noted that this finding validates a new method for identifying supermassive black holes that do not reside in their expected galactic centers. Researchers hypothesize that this "orphan" black hole may have reached its current position through a complex history of galactic mergers, potentially being ejected from a center during a gravitational interaction between multiple black holes or arriving via a merging dwarf galaxy.

The study, published in The Astrophysical Journal Letters, suggests that these wandering black holes may be more common than previously understood. As the Swift mission prepares for an upcoming orbit boost to extend its operational life, astronomers plan to utilize data from the Vera C. Rubin Observatory and the Nancy Grace Roman Space Telescope to conduct a broader census of these elusive objects across cosmic history.

Source: NASA