When some stars die, they explode in a brilliant blaze. Neutrinos emit a large quantity of energy (around 99 percent). Supernova 1987A released neutrinos, which were detected by the Kamiokande and IMB collaborations in 1987. This was the first time supernova neutrinos were discovered. Because neutrinos depart the core of supernovae faster than photons, neutrinos reach Earth before the supernova’s light does. SNEWS, the Supernova Early Warning System, was created as a result of this discovery. This project (which has been functioning in automatic mode since 2005) connects neutrino experiments all over the world and notifies astronomers if a supernova neutrino burst is detected in several detectors. This allows optical scientists to point their telescopes at the supernova and collect more data.