A mysterious neutrino detected in 2023 may be debris from an exploding primordial black hole. Scientists say the ultra-energetic particle defies known cosmic sources and could represent Hawking radiation, offering rare insight into early-universe physics and the possible nature of dark matter while challenging theories of black holes and cosmology.​A mysterious neutrino detected in 2023 may be debris from an exploding primordial black hole. Scientists say the ultra-energetic particle defies known cosmic sources and could represent Hawking radiation, offering rare insight into early-universe physics and the possible nature of dark matter while challenging theories of black holes and cosmology.  ​ science