Neutron stars are the densest objects in the universe from "summary" of Astrophysics for People in a Hurry by Neil deGrasse Tyson
Neutron stars are the densest objects in the universe. Imagine taking the entire mass of the Sun and squeezing it into a sphere the size of a city. That's what a neutron star is - a stellar remnant so compact that a single teaspoon of its material would weigh billions of tons.
When a massive star exhausts its nuclear fuel, it can no longer support its own weight against gravity. The star collapses under its own gravity, compressing its atoms into a state where electrons merge with protons to form neutrons. The result is a neutron star - a tiny, incredibly dense object made almost entirely of neutrons.
Neutron stars are born in the violent aftermath of a supernova explosion, where a massive star's outer layers are blown away, leaving behind a dense core. These remnants are typically only about 12 miles in diameter, yet they can contain more mass than the Sun. This extreme density gives neutron stars some remarkable properties.
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