Here's why:

* Formation: Neutron stars form when massive stars (8 to 20 times the mass of our Sun) run out of fuel and collapse under their own gravity.

* Extreme Density: During this collapse, protons and electrons in the star's core are forced together to form neutrons. This creates an incredibly dense object, packed with neutrons.

* Size and Mass: Neutron stars are typically only about 12 miles (20 kilometers) in diameter, but they can have a mass up to twice that of our Sun. This means their density is off the charts!

* Comparison: A teaspoonful of neutron star material would weigh billions of tons on Earth!

While black holes are even denser than neutron stars, they are not considered stars. They are formed from the collapse of even more massive stars and represent a singularity, a point of infinite density.

Here's a quick breakdown of density:

* White dwarf: 1 million times denser than water.

* Neutron star: 100 billion times denser than water.

* Black hole: Infinitely dense (technically).

So, while black holes are the densest objects we know of, neutron stars take the crown for the densest stars.