Neutron Stars May Harbor the Big Bang’s Quark–Gluon Plasma

Scientists propose that the ultra-dense interiors of neutron stars could contain quark-gluon plasma—the same state of matter that existed moments after the Big Bang—and by analyzing how tidal forces in binary neutron-star systems imprint oscillation modes on gravitational waves, researchers hope to infer the stars’ interior structure and their equation of state, though current detectors aren’t yet sensitive enough; next‑generation observatories may confirm the presence of this exotic matter.