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Cosmic Mysteries
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A teaspoon of neutron star crushes mountains

It sounds wild, but a tiny bit of this star stuff really weighs more than you'd think

By Smartasaurus· 1 min read Cosmic

Imagine holding a teaspoon that weighs one billion tons

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The short version
  • It sounds wild, but a tiny bit of this star stuff really weighs more than you'd think
  • To understand this scale, imagine taking the entire Earth and crushing it down until it fits inside a marble.
  • If you stood on the surface of a neutron star, the gravity would flatten you into a layer of atoms just one atom thick.

If you managed to scoop up a teaspoon of material from a neutron star, you wouldn't be able to hold it. The spoon would immediately crash through your hand, through the floor, and plunge straight to the center of the Earth. That tiny bit of matter weighs about 1 billion tons—the same as the entire human population combined, or all the cars in the United States.

Neutron stars are what happens when a massive star runs out of fuel and collapses. The gravity is so intense that it crushes atoms until the electrons are forced into the protons, turning the whole thing into a ball of neutrons. All the empty space that usually makes up an atom is gone.

To understand this scale, imagine taking the entire Earth and crushing it down until it fits inside a marble. That marble would have the same density as a neutron star. A star with twice the mass of our sun is squeezed into a sphere only about 12 miles wide, the size of a small city.

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