A neutron star can outweigh the Sun and still measure only about 20 kilometers across — roughly the size of a city, not a solar system.
It is the collapsed core of a massive star. Protons and electrons crush together into neutrons, and the whole remnant shrinks until it is denser than an atomic nucleus stretched over a skyline.
That tiny size is why pulsars can spin hundreds of times a second without flying apart. The heaviest ordinary matter we know is packed into something you could drive across before lunch.
Shahzad Mahota
A neutron star is only about 20 kilometers across
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