Neutrino Astronomy David Saltzberg, University of California, Los Angeles

Half of this year's Nobel Prize was given for the birth of neutrino astronomy, namely the first observations of neutrinos from astrophysical sources.    The observatories that made these discoveries did so by developing innovative and difficult techniques. These observations have also led to radical changes in physicists' understanding the elemental properties of the neutrinos themselves, including that neutrinos have mass.  I will discuss these ideas, and also the efforts to extend neutrino astronomy to extremely high energies, where neutrinos rather than photons may be our best astronomical tool.