Neutron stars are under incredible pressure. Take a star twice the size of our sun, squish all that mass down to the diameter of a city, and you get a neutron star, the densest known object in the universe. So it comes as a bit of a shock to learn that protons — the particles inside every atom of everything you know, including stars themselves — contain pressures 10 times greater than that. How did it take us this long to find out?
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Written by Ashley Hamer June 1, 2018
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