Note that this list is mainly about the development of knowledge, but also about some supernovae taking place. For a separate list of the latter, see the section "Notable supernovae" in the article supernova.
1006 - The brightest (magnitude -9m)recorded supernova is observed in the constellation of Lupus
1933 - Fritz Zwicky[?] and Walter Baade[?] propose the neutron star idea and suggest that supernovae might be created by the collapse of normal stars to neutron stars---they also point out that such events can explain the cosmic ray background,
1942 - J.J.L. Duyvendak, Nicholas Mayall[?], and Jan Oort[?] deduce that the Crab Nebula is a remnant of the 1054 supernova observed by Chinese astronomers,
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