Did you know that a teaspoon of material from a neutron star weighs about 6 billion tons? Neutron stars are extremely dense, with masses around 1.4 times that of the sun packed into a sphere only about 10 kilometers in diameter. Due to their intense gravity, the surface of a neutron star has a pressure of a hundred billion times that of Earth's atmosphere, which can cause physical changes to matter, such as flattening out mountains and stretching out atoms.
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