A TEASPOON OF THIS IS HEAVIER THAN THE EARTH!!!!!!!

Have you ever considered how dense matter can become? We have a fairly intuitive understanding of the relationship between density and intensity thanks to our perceptive abilities. Wrapping our hands around a cast iron rod, for example, allows us to feel its strength and weight. We know it's not the case for cotton.
But, beyond that, our comprehension is restricted when it comes to things we can't touch or feel.

Did you know that certain substances have such a high density that a single teaspoon of them weighs approximately 6 billion tonnes?

That's right! The density of matter within neutron stars is due to giant stars falling on themselves after death. Supernovas, which are several times the size of our planet, run out of fuel and explode in a huge explosion. As a consequence, the strain that is causing them to stretch outward is relieved. This causes these massive structures, which dwarf our own sun in scale, to be crammed into abnormally small spaces (a few kilometres) in comparison to their mass.

How is this possible, though?
In general, a restricting force prevents matter from being compressed into smaller spaces within itself. This limiting force, known as Fermionic Repulsion Pressure (FRP), keeps molecules apart even at absolute zero temperature, when vibrational energy in molecules is zero, defining an upper-bound for density. The closer molecules get beyond a certain threshold, the stronger the FRO becomes. However, when supernovas collide, the force is so powerful that even FRP can't keep it together, causing matter to collapse in on itself!!

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