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Neutron stars are structured like chocolate pralines, scientists reveal

Neutron stars are structured like chocolate pralines, scientists reveal

Neutron stars, which are formed when a supermassive star collapses, are incredibly compact and dense - physicists describe them as akin to the mass of the sun being compressed into a sphere the size of a large city.
It turns out the Milky Way is not the only cosmic entity with chocolatey connotations.
More than 60 years after they were first discovered, scientists working to understand the structure of neutron stars finally have the perfect point of comparison: chocolate pralines.
Neutron stars, which are formed when a supermassive star collapses, are incredibly compact and dense - physicists describe them as akin to the mass of the sun being compressed into a sphere the size of a large city.
Such extreme conditions cannot be replicated in a laboratory, so researchers have had their work cut out to better understand exactly what makes up a neutron star.
Using hundreds of thousands of so-called equations of state, which aim to describe the stars' properties, a team at Goethe University Frankfurt made a discovery which gave them their tasty new point of reference.
"Light" neutron stars (with masses smaller than about 1.7 solar masses) seem to have a soft mantle and a stiff core, whereas "heavy" neutron stars (with masses larger than 1.7 solar masses) have a stiff mantle and a soft core.
Just to put into context how dense a neutron star is, a single solar mass means the mass of the sun, which itself is estimated at 330,000 times the mass of the Earth.
The key equation behind the finding was the speed of sound, which measures how fast sound waves bounce around within an object.
This will depend on how stiff or soft matter is, and on Earth is used to explore the inside of the planet and discover oil deposits.
Professor Luciano Rezzolla, who led the university group, said: "This result is very interesting because it gives us a direct measure of how compressible the centre 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 centre surrounded by soft chocolate, whereas heavy stars can be considered more like those chocolates where a hard layer contains a soft filling."
Despite the sweet satisfaction of their latest findings, the physicists say neutron stars still harbour many mysteries, including when it comes to their exact structure and composition.

news.sky.com