The known history of supernova observation goes back to 185 CE, when supernova SN 185 appeared, the oldest appearance of a supernova recorded by humankind. Several additional supernovae within the Milky Way galaxy have been recorded since that time, with SN 1604 being the most recent supernova to be observed in this galaxy.
Since the development of the telescope, the field of supernova discovery has expanded to other galaxies. These occurrences provide important information on the distances of galaxies. Successful models of supernova behavior have also been developed, and the role of supernova in the star formation process is now increasingly understood.
Read more about History Of Supernova Observation: Early History, Telescope Observation, 1970–1999, 2000 To Present, Future
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... The estimated rate of supernova production in a galaxy the size of the Milky Way is about one every 50 years ...
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