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Crusta stelara este de 10 miliarde ori mai puternica decat otelul 
Pe baza unor noi calcule facute cu un computer de ultima generatie, cercetatorii estimeaza ca crusta care acopera stelele din clasa Neutron este cel mai dur material cunoscut in Univers.
Pentru a determina punctul de rupere a unei portiuni din scoarta unei stele Neutron, echipa cercetatorilor din cadrul Universitatii Indiana a simulat modificarea si deformarea crustei stelare respective prin intermediul bombardarii cu un flux magnetic. Rezultatele au fost surprinzatoare pentru toata lumea, demonstrand ca un fragment din crusta unei stele Neutron poate suporta o forta de 10 miliarde de ori mai mare decat cea necesara pentru a indoi o bucata de otel de aceeasi dimensiune.
„Suna dramatic si incredibil in acelasi timp, dar este foarte adevarat. Crusta stelelor de tip Neutron este cea mai dura forma de materie cunoscuta pana in prezent din intregul Univers”, declara Charles Horrowitz, conducatorul grupului de cercetari.
Stelele din clasa Neutron sunt cele mai dense obiecte din Univers dupa Gaurile Negre. Pentru exemplificare, o simpla lingurita de ceai plina cu materie de pe o stea Neutron, cantareste circa o suta de milioane de tone!
Spre deosebire de stelele obisnuite, stelele Neutron au o suprafata foarte dura care acopera un miez alcatuit dintr-un amestec de particule subatomice superdense, sunt de parere astronomii. Cu toate ca suprafata unei astfel de stele este incredibil de dura, ea se crapa deseori datorita presiunii exercitate de campul magnetic extrem de puternic al unei stele Neutron.
Star Crust Is Ten Billion Times Stronger Than Steel
A new computer model suggests that the outer crusts of so-called neutron stars are the strongest known material in the universe.
To determine the breaking point of a neutron star's crust, the team modeled magnetic field stresses and crust deformation for a small region of the star's surface.
The results showed that the crust of a neutron star can withstand a breaking strain up to ten billion times the pressure it would take to snap steel.
"It sounds dramatic, but it's true," said study team member Charles Horowitz of Indiana University.
Breakable
Neutron stars are the second densest objects in the universe after black holes. A teaspoonful of neutron star matter would weigh about a hundred million tons.
Unlike normal stars, neutron stars have solid outer shells that hold a soup of superdense subatomic particles, astronomers believe.
Even though a neutron star's crust is incredibly strong, it can crack due to stress from the star's powerful magnetic field, experts say.
Astronomers think that crust cracks can create "magnetar flares," extremely energetic gamma-ray bursts from strongly magnetized neutron stars.
(Related picture: "Pulsar Creates Cosmic 'Hand.'"
Stellar Goose Bumps
The model also has implications for the height of neutron star "mountains," irregularities on the surfaces of the stars that are thought to help create gravitational waves.
The waves are theoretical ripples in the fabric of space-time that race outward at light speed from massive spinning objects.
The new calculations suggest the mountains are more like stellar goose bumps than giant peaks.
For instance, the mountains can be a few kilometers wide but only about a centimeter (0.39 inch) high, Horowitz said.
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