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What's Inside Neutron Stars?


What’s Inside Neutron Stars?
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Size measurements of two neutron stars are narrowing down what kinds of exotic matter might exist in their extremely dense cores.
Neutron stars are the tricksters of the celestial sphere. Their age, their temperature, even their size is not always what it first appears to be.
But with the Neutron star Interior Composition Explorer (NICER) aboard the International Space Station, astronomers are finally beginning to make some headway measuring these stars’ actual size and with that, some insight into their strange interiors.
Members of the NICER team presented two independent size measurements of the most massive neutron star known at the recent virtual meeting of the American Physical Society. These studies, now undergoing scientific review, suggest that nuclear physicists might need to rethink what happens in the stars’ ultra-dense cores. ....

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Physics - Sizing Up the Most Massive Neutron Star


Sizing Up the Most Massive Neutron Star
April 29, 2021•
Physics 14, 64
A satellite experiment has revealed that the heaviest known neutron star is unexpectedly large, which suggests that the matter in the star’s inner core is less “squeezable” than some models predict. 
Goddard Space Flight Center
NICER measures the size of a neutron star by tracking the x-ray emission from “hot spots” on the surface as the star rotates. These spots occur at the magnetic poles of the star, where the field slams particles onto the star surface.
Goddard Space Flight Center
NICER measures the size of a neutron star by tracking the x-ray emission from “hot spots” on the surface as the star rotates. These spots occur at the magnetic poles of the star, where the field slams particles onto the star surface.× ....

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Nature's most magnetic objects, ripped apart in starquakes, can unleash powerful flashes of light | Science


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Plasma bursts from a magnetar starquake in this artist’s conception, an eruption that can create a gamma ray flare.
NASA’s Goddard Space Flight Center/Chris Smith/USRA/GESTAR
Nature’s most magnetic objects, ripped apart in starquakes, can unleash powerful flashes of light
Apr. 8, 2021 , 2:00 PM
On 15 April 2020, a wave of gamma rays, nature’s most powerful kind of light, washed across the Solar System like a storm front. First contact came above Mars, where photons at energies comparable to the radiation from a nuclear bomb peppered a Russian particle detector on NASA’s Mars Odyssey probe. Six minutes later, the burst of light lit up a solar wind probe between the Sun and Earth. Five seconds after that, the signal splashed into specialized detectors on Earth’s surface. ....

Sankt Peterburg , Y Chu Uiuc , Oliver Roberts , Robert Duncan , Joshua Sokol , Chris Thompson , Chryssa Kouveliotou , Kevin Hurley , Bohdan Paczy , Hubble Heritage Team Stsc , George Washington University , Interplanetary Network , Goddard Space Flight Center Chris Smith , Los Alamos National Laboratory , Universities Space Research Association , Rice University , Solar System , George Washington , Milky Way , Matthew Baring , Cold War , Iron Curtain , Large Magellanic Cloud , Universities Space Research , ஆலிவர் ராபர்ட்ஸ் , ராபர்ட் டங்கன் ,