How Do We Know That Pulsars Are Neutron Stars?

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How Do We Know That Pulsars Are Neutron Stars?

Are all neutron stars also pulsars? Explain.
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The first indication was the very short period of some pulsars. Nothing else could rotate that fast without flying apart. The neutron star theory of pulsars has been further advanced by the study of a binary neutron star/pulsar, which has shown behavior predicted for such a system by general relativity theory. Probably not all neutron stars are pulsars. There are several mechanisms by which a neutron star may emit pulses, but the necessary conditions won't exist for all neutron stars. However, we can detect only those pulsars that emit their energy in our direction.

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