Prof. Kohta MuraseIn, Institute for Advanced Study (IAS) Abstract: 2013, the IceCube collaboration reported 28 events of high-energy neutrino events. They are likely to contain extraterrestrial signals, and it is the dawn of a new age of neutrino astrophysics. In this talk, I try to demystify the origin of the observed neutrino signals. I discuss various astrophysical possibilities, and then demonstrate the power of the multi-messenger approach to reveal the origin. Additional details of the upcoming Astrophysics' seminars can be found on the following link. ‏האירוע הזה כולל שיחת וידאו ב-Google Hangouts. הצטרף: https://hangouts.google.com/hangouts/_/mail.huji.ac.il/high-energy?hceid=bWFpbC5odWppLmFjLmlsX2c0czhydDlpcmhwZzRvdGNybWIzZGFqcjdvQGdyb3VwLmNhbGVuZGFyLmdvb2dsZS5jb20.7ftbuqob5ieskjc0vvc28er894&hs=121