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Really Small Black Holes Could Be Out There, Devouring Neutron Stars From Within

Tiny, all-but-undetectable primordial black holes could be one of the mysterious sources of mass that contributes to dark matter. There are significant limits to their lifespan in open space, but in recent years, astrophysicists have asked: what if ....

Bowdoin College , University Of Illinois At Urbana Champaign , Big Bang , பெடோய்ன் கல்லூரி , பல்கலைக்கழகம் ஆஃப் இல்லினாய்ஸ் இல் ஊர்பன சாம்பியன் , பெரியது இடி ,

Colliding White Dwarfs Produced Bizarre Slime-Green Zombie Star

BRIAN KOBERLEIN, UNIVERSE TODAY
A white dwarf isn t your typical kind of star.
While main sequence stars such as our Sun fuse nuclear material in their cores to keep themselves from collapsing under their own weight, white dwarfs use an effect known as quantum degeneracy. The quantum nature of electrons means that no two electrons can have the same quantum state.

When you try to squeeze electrons into the same state, they exert a degeneracy pressure that keeps the white dwarf from collapsing.
But there is a limit to how much mass a white dwarf can have.
Subrahmanyan Chandrasekhar made a detailed calculation of this limit in 1930 and found that if a white dwarf has more mass than about 1.4 Suns, gravity will crush the star into a neutron star or black hole. ....

Subrahmanyan Chandrasekhar , Newtonx Ray , Chandra Sekhar , சந்திரா சேகர் ,

NASA shares picture of star whose weight is equal to Mount Everest

NASA shares picture of star which weighs as much as Mount Everest
NASA said that the matter in the neutron star is packed together so tightly that a sugar-cube-sized amount of neutron star material would weigh more than 1 billion tonnes
BusinessToday.In | January 19, 2021 | Updated 18:57 IST
Astronomers first detected the neutron star in 2016 by using NASA s Chandra X-ray Observatory and other X-ray observatories
NASA has shared a scintillating image of a neutron star in the middle of a supernova remnant via its Chandra X-ray observatory telescope.
The US space agency has claimed that the weight of the neutron star would be equal to the weight of Mount Everest. ....

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Traces of a Mysterious Particle Predicted Decades Ago May Have Been Detected

Traces of a Mysterious Particle Predicted Decades Ago May Have Been Detected
Evidence of a long-sought hypothetical particle could have been hiding in plain (X-ray) sight all this time.
The X-ray emission coming off a collection of neutron stars known as the Magnificent Seven is so excessive that it could be coming from axions, a long-predicted kind of particle, forged in the dense cores of these dead objects, scientists have demonstrated.

If their findings are confirmed, this discovery could help unravel some of the mysteries of the physical Universe – including the nature of the mysterious dark matter that holds it all together. ....

Benjamin Safdi , University Of Minnesota , Draymond Co , Lawrence Berkeley National Laboratory , Magnificent Seven , Standard Model , Physical Review , X Ray , Amp Quot , பல்கலைக்கழகம் ஆஃப் மினசோட்டா , ரேமஂட் இணை , லாரன்ஸ் பெர்க்லி தேசிய ஆய்வகம் , அற்புதமான ஏழு , தரநிலை மாதிரி , உடல் விமர்சனம் , எக்ஸ் ராய் ,

A Prime Suspect for Dark Matter Might Be Escaping From Neutron Stars

A Prime Suspect for Dark Matter Might Be Escaping From Neutron Stars
Image: NASA/Chandra X-Ray Observatory (Fair Use)
After axions were first theorized by physicists in the suburbs of Chicago 45 years ago, they quickly became a robust candidate for explaining dark matter. All this time, though, the ultra-small particles have remained hypothetical. Now, a team of astrophysicists have proposed that axions may be responsible for an excess of X-ray emissions seen coming from a group of neutron stars in our galaxy.
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The stars dubbed the “Magnificent Seven” are neutron stars that emit low-frequency X-ray radiation from their surfaces. Neutron stars are the extremely dense afterlives of collapsed stars. They possess powerful magnetic fields, and, as their name would suggest, are constituted in large part by neutrons. The new research, published this week in the journal Physical Review Letters, focuses on a yet-unexplained bunch of high-frequency X-rays th ....

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