• Jun 4, 2026 neutron stars and pulsars astrophysics and space it). Radius: About 10 to 12 kilometers, comparable in size to a city. Density: Approximately 10^17 to 10^18 kg/m^3—comparable to the density of atomic nuclei. Gravity: Surface gravity is about 10^11 times that of Earth's gravity. By Blanca Schaefer V
