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It is shown that both supernova remnants and visual supernovae require continuous energy input. The characteristics of pulsars, known to be associated with supernova remnants, make them ideal candidates for this energy source; in this picture both the expansion kinetic energy and the visual output are provided by the rotation of a neutron-star remnant. Comparisons with observations are made for the Crab Nebula, Vel X, Cas A, and i~ Car
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Ostriker et al. (1971) studied this question.
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