Cosmic rays from outer space sound like science fiction. They’re not—invisible particles flung from outer space pass through our bodies every minute. But not all cosmic rays are equal. Some are immensely powerful and very rare. For decades, scientists have wondered where they’re coming from – and what could possibly be hurling them at Earth. Now, they’re getting closer to finding out. Ross Chambless has the story.
This story was originally produced by Ross Chambless in 2015. It was hosted and mixed for Transistor by Josh Swartz. Outro music by Podington Bear.