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Housing and Development Newsletter The team found the supernova SN 2018zd had many unusual characteristics, some of which were seen for the first time in a supernova. It helped that the supernova was relatively nearby only 31 million light-years away in the galaxy NGC 2146. This allowed the team to examine archival images taken by the Hubble Space Telescope prior to the explosion and to detect the likely progenitor star before it exploded. The observations were consistent with another recently identified SAGB star in the Milky Way, but inconsistent with models of red supergiants, the progenitors of normal iron core-collapse supernovae. The authors looked through all published data on supernovae, and found that while some had a few of the indicators predicted for electron-capture supernovae, only SN 2018zd had all six: an apparent SAGB progenitor, strong pre-supernova mass loss, an unusual stellar chemical composition, a weak explosion, little radioactivity, and a neutron-rich

Andrew howellKenichi nomotoKen nomotoDaichi hiramatsuSanta barbaraUniversity of tokyoLas cumbres observatoryNature astronomyGlobal supernova projectHubble space telescopeMilky wayMilky way galaxyCrab nebulaRosetta stoneஆண்ட்ரூ ஹோவெல்தைய்சி ஹிராமட்சு