Galaxies on Instagram: "Neutron stars are the collapsed cores of massive stars, and they’re some of the most extreme objects in the universe. A single teaspoon of their material would weigh billions of tons on Earth, crushing anything beneath it instantly. They are only about 20 kilometers across, yet they can pack in more mass than the Sun, making them unimaginably dense. Their gravity is so intense that it warps space and time around them. Some neutron stars spin hundreds of times per second,