Recent evidence suggests that the cores of massive neutron stars could be composed of quark matter, a type of matter composed of subatomic particles called quarks. This discovery could help to explain the structure and evolution of neutron stars, which are some of the densest objects in the universe. Quark matter has been theorized to exist in the cores of neutron stars since the 1970s, but this is the first direct evidence that it may be present. The findings were published in the journal Nature.

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source: Phys.org