ᴜɴɪᴠᴇʀsɪᴀ on Instagram: "A neutron star is one of the most extreme objects in the universe. Despite being only about 20 km across (roughly the size of New York City), it can pack more mass than our entire Sun. 🌌⚡ The density is so staggering that a teaspoon of neutron star material would weigh around a billion tons on Earth. Formed from the collapsed core of a massive star after a supernova, neutron stars are cosmic laboratories of physics where gravity, density, and magnetic fields reach unima