High-energy neutrinos are hard-to-catch particles that scientists think are created by the most powerful events in the cosmos, like galaxy mergers and material falling onto supermassive black holes. For the first time ever, scientists using our Fermi Gamma-ray Space Telescope have found the source of one of these zippy neutrinos from outside our galaxy! Fill your brain with more factoids about this cool new science discovery: https://go.nasa.gov/2NallE5 | NASA - National Aeronautics and Space Ad