Cassiopeia A - Superfluid Found In Neutron Star's Core

Supernova remnant Cassiopeia A (Cas A) is the remains of a massive star 11,000 light years away that would have appeared to explode about 330 years ago as observed from Earth. Neutron stars like Cas A contain the densest known matter that is directly observable. One teaspoon of neutron star material weighs six billion tons. The pressure in the star's core is so high that most of the charged particles, electrons and protons, merge resulting in a star composed mostly of uncharged particles called neutrons. read more

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