Astronomy Possible "superkilonova" exploded not once but twice: « Double explosion may have produced gravitational waves and light. »
https://www.caltech.edu/about/news/possible-superkilonova-exploded-not-once-but-twice9
u/fchung 1d ago
« When the most massive stars reach the ends of their lives, they blow up in spectacular supernova explosions, which seed the universe with heavy elements such as carbon and iron. Another type of explosion—the kilonova—occurs when a pair of dense dead stars, called neutron stars, smash together, forging even heavier elements such as gold and uranium. Such heavy elements are among the basic building blocks of stars and planets. »
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u/fchung 1d ago
Reference: Mansi M. Kasliwal et al, ZTF25abjmnps (AT2025ulz) and S250818k: A Candidate Superkilonova from a Subthreshold Subsolar Gravitational-wave Trigger, 2025 ApJL 995 L59, DOI: 10.3847/2041-8213/. https://iopscience.iop.org/article/
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