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Neutron star An extremely dense neutron star with mass equal to that of the Sun has a radius of about 10 km—about the sue of Manhattan island. These stars are thought to route once about their axis every 0.03 to 4 s. depending on their size and mass. Suppose that the neutron star described in the first sentence rotates once every 0.040 s. If its volume then expanded to occupy a uniform sphere of radius
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