<ul><li>Scientists have discovered a new way to study the mysterious interiors of neutron stars by listening to the “pure tone” they produce after a collision.</li><li>The signal, known as the “long ringdown”, could provide important clues about what neutron stars are made of.</li><li>The long ringdown signal is closely linked to the “equation of state” that describes how matter behaves at extreme densities.</li><li>Analyzing the long ringdown could greatly reduce uncertainty about the equation of state, helping scientists understand matter under extreme conditions.</li></ul>

Neutron star collisions could reveal their deepest secrets

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