Ultra-energetic cosmic ray from unidentified source is falling to Earth

Astronomers have discovered an incredibly high-energy particle falling to Earth from space. It's among the highest-energy cosmic rays ever detected, say scientists. However, the origins of this particle, which is named Amaterasu after the Japanese sun goddess, are a mystery. Experts believe that only the most powerful celestial events can produce such particles. John Matthews, a research professor at the University of Utah, said, "Things that people think of as energetic, like supernova, are nowhere near energetic enough for this."