... Time for SNEWS . Astronomers have linked neutrino observatories around the world to create an early warning system for exploding stars. ... A lthough astronomers estimate a star explodes in our galaxy every few decades, the last Milky Way supernova was observed in 1604. ... Multiple detectors would see a real supernova simultaneously, so SNEWS won't generate false alarms, and the scientists believe neutrinos from supernovae in other galaxies will be too weak for these facilities to detect. ...