For years, astronomers have been trying to locate the source of high-energy cosmic rays that hit the Earth's atmosphere. In new work published this week in the journal Science, researchers report that the most energetic cosmic rays they detected can usually be traced back to areas of the sky that contain nearby Active Galactic Nuclei, which are thought to be powered by supermassive black holes devouring large amounts of matter. The work was based on detailed observation of 77 extremely high energy cosmic ray events using the Pierre Auger Observatory in Argentina. In this segment, Ira and guests talk about the findings and what they might mean.
Produced by Annette Heist, Senior Producer