🔭 NASA Discovers a “Wandering” Supermassive Black Hole Devouring a Star Far from Any Galactic Center

Astronomers have observed something never before seen in optical light: a supermassive black hole tearing apart a star more than 30,000 light-years from the center of its host galaxy — far from where such giants are normally found.

The event, designated TDE 2025abcr, was first detected in November 2025 by the Zwicky Transient Facility. An AI algorithm scanning roughly 500,000 transient events every night flagged an unusual flare despite its highly unexpected location in the outskirts of a galaxy.

At its peak, the flare shone with the luminosity of roughly 10 billion Suns, briefly outshining its host galaxy in ultraviolet light. Follow-up observations with NASA’s Neil Gehrels Swift Observatory showed that the culprit is a black hole with a mass of about one million Suns, feeding on a star that wandered too close.

So how did such a massive black hole end up so far from the galactic center?

Astronomers propose two leading explanations:

• it was gravitationally ejected during a past merger involving multiple supermassive black holes;

• or it originally belonged to a dwarf galaxy that is still merging with the larger host galaxy.

The discovery demonstrates a new way to find these otherwise invisible wandering supermassive black holes. With the Vera C. Rubin Observatory beginning operations and NASA’s Nancy Grace Roman Space Telescope on the horizon, astronomers expect to uncover many more—revealing how common these cosmic wanderers really are and providing new clues about the violent merger history of galaxies.

Sources:

NASA: https://science.nasa.gov/missions/swift/nasas-swift-sees-wandering-mega-black-hole-shredding-star/

The Astrophysical Journal Letters: https://iopscience.iop.org/article/10.3847/2041-8213/ae77f3

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