For years, physicists hoped that a mysterious “fourth” type of neutrino—the sterile neutrino—would explain gaps in our understanding of dark matter. However, the latest results from the MicroBooNE experiment at Fermilab have ruled out the existence of a single sterile neutrino with 95% certainty. While this “kills” one of the most popular theories in particle physics, it forces scientists to look for even more “exotic” explanations for the universe’s missing mass, potentially leading to even more radical discoveries in 2026.
Source: Fermilab / Nature
Link: https://news.fnal.gov/2025/12/fermilabs-accomplishments-highlight-discovery-and-innovation-2025/







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