On Sept. 22, 2017, a ghostly particle ejected from a far distant supermassive black hole zipped down from the sky and through the ice of Antarctica at just below the speed of light, with an energy of some 300 trillion electron volts, nearly 50 times the energy delivered by the Large Hadron Collider at CERN, the biggest particle accelerator on Earth. IceCube Neutrino Observatory The cosmic invader –a messenger from the depths of extragalactic space, carrying secrets from some of the most extreme physics in the universe– triggered a cacophony of code-red detectors in the IceCube Neutrino Observatory (image below) located at the Amundsen-Scott South Pole Station, perhaps solving one of the enduring mysteries of physics and the cosmos.