Quark matter — the fifth state of matter within neutron stars

The fabric of spacetime experiences ripples during events like the collision of neutron stars, as seen here in a simulation. Video credit: Numerical Relativity Simulation: T. Dietrich (Nikhef), Wolfgang Tichy (Florida Atlantic University) and the CoRe-collaboration Scientific Visualization: T. Dietrich (Nikhef), S. Ossokine, and A. Buonanno (Max Planck Institute for Gravitational Physics) / .gif creation by The Cosmic Companion
Neutron stars could possess quark cores, where gravitational pull is so great, not even protons and neutrons can withstand the pressure, collapsing into component particles, called quarks. Image credit: Jyrki Hokkanen CSC — IT Center for Science
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