{
  "id": 139256,
  "title": "In a First, Astronomers May Have Spotted a Supermassive Black Hole That Wandered to the Edge of Its Galaxy",
  "url": "https://urgent.news/2026/08/04/in-a-first-astronomers-may-have-spotted-a-supermassive-black-hole",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-04T16:16:17.000Z",
  "source": {
    "name": "Smithsonian",
    "slug": "smithsonian",
    "url": "https://www.smithsonianmag.com/smart-news/in-a-first-astronomers-may-have-spotted-a-supermassive-black-hole-that-wandered-to-the-edge-of-its-galaxy-180989233/"
  },
  "original_language": "en",
  "account": "For the first time, astronomers may have discovered a supermassive black hole wandering at the edge of its home galaxy, rather than residing in the traditional center. The newfound black hole is located over 30,000 light-years from the heart of its host galaxy, which is a significant distance compared to the typical proximity of these massive celestial bodies to the galactic cores. This groundbreaking discovery is detailed in a paper published on July 27 in the Astrophysical Journal Letters. The study, led by Robert Stein from the University of Maryland, represents long-awaited evidence suggesting the existence of \"wandering\" black holes. Most large galaxies are thought to harbor supermassive black holes at their centers, such as the Milky Way's Sagittarius A*. However, when galaxies collide, the theoretical framework proposes that their black holes can sometimes be ejected into the cosmos. Identifying these elusive objects is challenging, as they do not emit light. Scientists search for them by looking for telltale signs, such as a sudden brightening followed by a gradual fade, caused by a tidal disruption event (TDE) when a star is pulled apart by the black hole's gravitational forces. The Milky Way's central black hole, about 4.3 million times the mass of our sun, was previously known. Prior to 2024, all TDEs observed by researchers occurred in galactic cores. In 2023, researchers reported evidence of a TDE around 2,600 light-years from its host galaxy's center, sparking interest in the possibility of wandering black holes. To search for these wandering black holes, Stein and his team developed an AI-based algorithm to automatically detect the TDE light pattern in data collected at the Palomar Observatory in California. The survey flagged a peculiar brightening event in a galaxy approximately 750 million light-years away in November 2025. Subsequent observations using space and ground-based telescopes revealed evidence of a probable TDE dubbed TDE 2025abcr on the outskirts of its host galaxy. The combination of multiple data sources helped confirm that this event is indeed a TDE occurring in an unusual location. Other researchers, such as Kishore Patra from the University of California, Santa Cruz, are actively studying the wandering black hole. Using the W. M. Keck telescopes in Hawaii and the James Webb Space Telescope, Patra and his colleagues observed TDE 2025abcr in visible and infrared light. These wavelengths are often obscured by the dense starlight in a galaxy's center. The team found stronger infrared emissions than expected, suggesting that stars—possibly remnants of a satellite galaxy that collided with the larger galaxy—may be orbiting the wandering black hole. This discovery could provide insights into the history of its home galaxy. Stein believes that identifying TDEs and black holes on the edges of galaxies could offer valuable information about the galaxy's past, including the number of mergers it has undergone and its evolutionary timeline.",
  "summary": "These giant celestial objects have mostly been identified at the centers of galaxies, where they're known to reside. But a recently discovered one—found because of the light emitted while it snacked on a star—appears to be more than 30,000 light-years from its host galaxy's heart",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}