• Neutron stars are ultra-dense remnants of massive stars that collapsed after supernova explosions and are made up mostly of subatomic particles with no electric charge (i.e., neutrons). • When two neutron stars collide, they are predicted to produce gravitational waves, ripples in the fabric of spacetime that travel at the speed of light.
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- Summary
Neutron stars-ultra‑dense remnants of massive stars-are composed almost entirely of neutrons and carry no electric charge. When two such stars spiral together and collide, they are expected to emit gravitational waves-ripples in spacetime that propagate at light speed. Recent observations have confirmed that these waves leave a lasting “memory” imprint on spacetime, a subtle but permanent distortion that persists long after the waves have passed. This persistence of gravitational‑wave memory provides a new window into the dynamics of compact binary mergers and offers a novel test of general relativity in the strong‑field regime.
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