Free Astronomy Magazine March-April 2026

48 MARCH-APRIL 2026 ASTRO PUBLISHING A mong the more puzzling cos- mic phenomena discovered over the past few decades are brief and very bright flashes of blue and ultraviolet light that grad- ually fade away, leaving behind faint X-ray and radio emissions. This curious class of objects is known as luminous fast blue optical transients (LFBOTs), and with slightly more than a dozen discovered so far, as- tronomers have debated whether they are produced by an unusual type of supernova or by interstellar gas falling into a black hole. Massive black holes behind blue cosmic explosions by NOIRLab, Natalie LeBaron, Josie Fenske T his composite image features X-ray, ultraviolet, optical, and near-infrared data of the luminous fast blue optical transient (LFBOT) named AT 2024wpp. The transient is the bright spot at the upper right edge of its host galaxy, which is 1.1 billion light-years from Earth. [International Gemini Observatory/NOIRLab/ NSF/AURA. Image Processing: J. Miller (International Gemini Observatory/NSF NOIRLab), T.A. Rector (University of Alaska Anchorage/NSF NOIRLab), M. Zamani & D. de Martin (NSF NOIRLab)] Analysis of the brightest LFBOT to- date, named AT 2024wpp, shows that they’re neither. Instead, a team led by researchers from the University of California, Berkeley, concluded that they are caused by an extreme tidal disrup- tion, where a black hole of up to 100 times the mass of our Sun com- pletely shreds its massive star com- panion within days. This discovery resolves a decade-long conundrum but also illustrates the many vari- eties of stellar calamities that as-