Source of rare cosmic rays striking Earth found to be outside the Milky Way

Scientists have known for a long, long time that the Earth is being hit by high-energy radiation coming from space, but in the decades since that discovery we've learned surprisingly little about the source. Now, in a new paper published in Science, researchers from the Pierre Auger Collaboration reveal that while they still don't know where the cosmic rays are coming from, they know for sure where it's not coming from: the Milky Way. The team was able to determine the extremely rough location o...