Life isn't really like a box of chocolates, but it seems that something out there is.
When the team used their equations of state to study the speed of sound in neutron stars, their structures were not uniform across the board. Rather, the neutron stars on the lower end of the mass range, below 1.7 times the mass of the Sun, seemed to have a squishy mantle and harder core, while those above 1.7 solar masses had a hard mantle and a squishy core.
"This result is very interesting because it gives us a direct measure of how compressible the center of neutron stars can be,""Neutron stars apparently behave a bit like chocolate pralines: light stars resemble those chocolates that have a hazelnut in their center surrounded by soft chocolate, whereas heavy stars can be considered more like those chocolates where a hard layer contains a soft filling.
This seems to fit with both the nuclear pasta and quark soup interpretations of neutron star innards, but it also provides new information that could help model neutron stars across a range of masses in future work. This could also explain how, regardless of their masses, all neutron stars have roughly the same diameter of around 20-kilometers.
"Our extensive numerical study not only allows us to make predictions for the radii and maximum masses of neutron stars, but also to set new limits on their deformability in binary systems, that is, how strongly they distort each other through their gravitational fields,""These insights will become particularly important to pinpoint the unknown equation of state with future astronomical observations and detections...
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