Untangling the Mystery of Cosmic Ray Sources

The north star indicates north. Seeing the moon overhead means...that the moon is overhead. It sounds obvious, right? But not everything works this way. Cosmic rays are high energy particles produced in astronomical events. They careen through space at very high speeds, some eventually making their way to Earth. Studying the cosmic rays that hit Earth and our atmosphere can tell us a whole lot about what's happening out there, but there is a big challenge: unlike light, cosmic rays don't travel ...