In Theory

While the explosive shock wave originates in the core, it does not start at the core's very center. If the core's mass was between 1.4 and 3 solar masses, the remnant at the center will be a ball of neutrons known as a neutron star.

In size, this so-called neutron star is small by astronomical standards—and tiny, compared to the high-mass star (many times the radius of our sun) of which it was a part. The neutron star's diameter would be something over twelve miles (20 km), and its density a staggering 1017 kg/m3. All of humanity (if compressed to the density of a neutron star) would be the size of a pea.

Telescopes Mastery

Telescopes Mastery

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