Baade and Zwicky propose supernovae and neutron stars

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Two papers in the Proceedings of the National Academy of Sciences introduced the term super-nova for a distinct and far more energetic class of stellar explosion, proposed that such events are the transition of an ordinary star into a star composed of closely packed neutrons, and connected them to cosmic rays. The neutron had been identified only two years earlier. The proposal was almost entirely theoretical and went without observational support for thirty-three years.

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