A Supernova Sent a Signal 3 Hours Before Its Light — This Seems Impossible

On February 23, 1987, a supernova sent a signal three hours before its light reached Earth. Neutrinos from Supernova 1987A passed through the entire planet and triggered underground detectors in Japan, the United States, and the Soviet Union. Then the sky lit up with the closest supernova seen in almost 400 years. How can a signal beat light across 168,000 light-years? Did anything break the speed limit of the universe? In this video, we explain: What neutrinos are and why they pass through solid rock like ghosts How the Kamiokande II, IMB, and Baksan detectors caught 24 neutrinos Why Supernova 1987A’s blue supergiant star broke the rules of stellar death How core collapse, the shock wave, and the three rings of gas shaped the explosion Why the light took about three hours to escape the star How the James Webb Space Telescope found a newborn neutron star hidden in the dust after 37 years If you love space, astronomy, astrophysics, and the biggest mysteries of the universe, like and subscribe for more explainers. #supernova #supernova1987a #neutrinos #space #astronomy #jameswebbtelescope #neutronstar #astrophysics #universe #science