The photo released on Nov. 21, 2013 by the US National Science Foundation (NSF) shows digital optical modules embedded in ice beneath. An international team of researchers said Thursday using a particle detector buried below the ice at the South Pole they have observed the first solid evidence for high-energy neutrinos that originate outside of our own solar system. (Xinhua/NSF)

The photo released on Nov. 21, 2013 by the US National Science Foundation (NSF) shows the IceCube detector, the world's largest neutrino observatory. An international team of researchers said Thursday using a particle detector buried below the ice at the South Pole they have observed the first solid evidence for high-energy neutrinos that originate outside of our own solar system. (Xinhua/NSF)