Last week the IceCube South Pole Neutrino Observatory published a press release reporting the possible discovery of two neutrinos with energies of over 1 PeV.
Would anyone here be willing to help me understand the significance of this announcement? Although it was reported in the press that these neutrinos originated from outside our galaxy, the original press release seemed to say that this might possibly be the first sighting of 'astrophysical' neutrinos. Are there other observations of extragalactic neutrinos? Are there any conjectures as to processes which might generate? How would a neutrino even be accelerated if it is unaffected by magnetic fields?