Ultra-energetic Cosmic Ray Amaterasu Traced to M82, a Nearby Starburst Galaxy
A 244 EeV cosmic ray named Amaterasu, detected in 2021 by the Telescope Array Project, is now thought to originate from a nearby star-forming galaxy, most plausibly M82, rather than the Local Void, after statistical reconstructions that combine simulations of cosmic-ray propagation with observations.