diana 🏳️‍⚧️🦋🌱 on Nostr: As the core of a massive star is compressed during a Type II supernova or a Type Ib ...

As the core of a massive star is compressed during a Type II supernova or a Type Ib or Type Ic supernova, and collapses into a neutron star, it retains most of its angular momentum. Because it has only a tiny fraction of its parent's radius (sharply reducing its moment of inertia), a neutron star is formed with very high rotation speed and then, over a very long period, it slows. Neutron stars are known that have rotation periods from about 1.4 ms to 30 s. The neutron star's density also gives it very high surface gravity, with typical values ranging from 1012 to 1013 m/s2 (more than 1011 times that of Earth).[12] One measure of such immense gravity is the fact that neutron stars have an escape velocity of over half the speed of light.[13] The neutron star's gravity accelerates infalling matter to tremendous speed, and tidal forces near the surface can cause spaghettification.[13]

https://en.wikipedia.org/wiki/Neutron_star

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