Using more than 10 million randomly generated equations of state that satisfy nuclear theory and astronomical observations, astrophysicists from the Institut für Theoretische Physik at Goethe Universität and elsewhere constructed a novel description of the sound speed in neutron stars. Their results suggest that ‘heavy’ neutron stars have a stiff mantle and a soft core, while ‘light’ neutron stars have a soft mantle and a stiff core. Ecker...
