Mysterious high-energy cosmic rays which have baffled scientists for half a century come from beyond our galaxy Prison Planet.com Posted on September 22, 2017 Posted in Aggregated No Comments Tagged with Sci Tech Daily Mail | For half a century, astronomers have been unable to find the source of the most energetic rays in our universe. Share this:Share Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email