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Some consequences are discussed of the hypothesis that certain stars and cores of stars are composed mainly of neutrons. On the assumption that supernovae represent rapid transitions of ordinary stars into neutron stars, the large red shifts observed in the spectra of the recent bright supernovae are interpreted as gravitational red shifts. The neutron-star hypothesis, in conjunction with the general theory of relativity, leads to a theory of critical stellar masses
F. Zwicky (Tue,) studied this question.