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flag A massive star in Andromeda vanished after brightening, possibly collapsing directly into a black hole without a supernova, offering rare evidence of black hole formation.

flag A star in the Andromeda Galaxy vanished after suddenly brightening around 2015, then fading rapidly, leaving only a faint infrared signal. flag Researchers, using 15 years of NEOWISE data, believe it may have collapsed directly into a black hole without a supernova, a rare event predicted by theory but rarely observed. flag The disappearance aligns with models of a "failed supernova," where a massive star dies quietly. flag While some experts suggest alternative explanations like dust or merging stars, the key test will be whether the remnant continues to fade, confirming the star’s final death. flag This event offers one of the best chances yet to observe black hole formation.

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