About J1859+0026g
J1859+0026g is an epic pulsar. It spins once every 8.57 ms and has a dispersion measure of 334.1 pc cm⁻³.
The collapsed core of a star that exploded: about one and a half Suns of matter crushed into a ball the size of a city, held up only by the refusal of neutrons to be squeezed further.