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#blackhole

1 post1 participant0 posts today
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Chi Kim

😲 A recent James Webb Space Telescope discovery might suggest our universe is trapped inside a black hole! Also, each and every black hole in our universe could be the doorway to another "baby universe. Wait, really? We were living in a black hole all this time? #blackhole #universe #WTF space.com/space-exploration/ja

Space · Is our universe trapped inside a black hole? This James Webb Space Telescope discovery might blow your mindBy Robert Lea
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🇨🇦 OhOkKay

This poll is now closed.
Thank you for your votes!
Apparently, y'all like to eat when dying in outter space. 😂

-------‐--‐‐‐-------------------
Silly Poll Time

Considering the current events of the world, which would you prefer?

Boost for more fun!

· 150 people · Closed
#poll#pizza#food
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Charo del Genio

Just found this gem on the arXiv. A calculation of the effects of a primordial black hole passing through a human body.

"Unfortunately, it is easy to see that the effect of PBH collisions with the human population will always be negligible.".

"UNFORTUNATELY". 😂😂😂

#physics #astrophysics #arXiv #blackhole #darkmatter #cynical #nihilist #preprint

arxiv.org/abs/2502.09734

arXiv.orgGravitational Effects of a Small Primordial Black Hole Passing Through the Human BodyThe gravitational effects of a primordial black hole (PBH) passing through the human body are examined, with the goal of determining the minimum mass necessary to produce significant injury or death. Two effects are examined: the damage caused by a shock wave propagating outward from the black hole trajectory, and the dissociation of brain cells from tidal forces produced by the black hole on its passage through the human body. It is found that the former is the dominant effect, with a cutoff mass for serious injury or death of approximately $M_{PBH} > 1.4 \times 10^{17} {\rm g}$. The number density of primordial black holes with a mass above this cutoff is far too small to produce any observable effects on the human population.
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Flipboard Science Desk

Two stars may be orbiting each other near a supermassive black hole in our Milky Way galaxy.

@AssociatedPress reports: "The celestial sighting is interesting and unusual, and more research is needed to be certain of what the objects are, said astrophysicist Anna Ciurlo with the University of California, Los Angeles."

flip.it/5l1Y2x

Here's the original study: nature.com/articles/s41467-024

AP News · Two stars may be orbiting each other near a supermassive black hole in our Milky Way galaxyBy ADITHI RAMAKRISHNAN
#Space#BlackHole#Galaxy
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Pᵉtɘr Wᵉil8acher

Interesting, the new Miyoshi paper has some pretty strong words about the EHT data "suggesting that the EHT 2017 u-v coverage is insufficient for reliable imaging" or "possible that the data are corrupted to the degree that the shape [...] cannot be determined from the residual analysis of the closure quantity". They do not see a ring but a strong peak, possibly offset from the black hole location.
#BlackHole #EHT #SgrA*
astrodon.social/@cosmos4u@scic

astrodon.socialAstrodon - The Astro Community
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Co widzę moim okiem...

"Primordial black holes created in the first instants after the Big Bang — tiny ones smaller than the head of a pin and supermassive ones covering billions of miles — may account for all of the dark matter in the universe.

That’s the implication of a new model of the early universe created by astrophysicists at Yale, the University of Miami, and the European Space Agency (ESA). If proven true with data from the soon-to-launch James Webb Space Telescope, the discovery would transform scientists’ understanding of the origins and nature of both dark matter and black holes.

Dark matter — which has never been directly observed — is thought to constitute the majority of matter in the universe and act as the unseen scaffolding upon which galaxies form and develop. Physicists have spent years testing a variety of dark matter candidates, including hypothetical particles such as sterile neutrinos, Weakly Interacting Massive Particles (WIMPS), and axions.

Black holes, on the other hand, have been observed. A black hole is a point in space where matter is so tightly compacted it creates intense gravity. Not even light can resist its pull. Black holes are found at the centers of most galaxies."

"Natarajan and her colleagues say their new model shows that the first stars and galaxies would have formed around black holes in the early universe. Also, she said, primordial black holes would have had the ability to grow into supermassive black holes by feasting on gas and stars in their vicinity, or by merging with other black holes."

“What I find personally super exciting about this idea is how it elegantly unifies the two really challenging problems that I work on — that of probing the nature of dark matter and the formation and growth of black holes — and resolves them in one fell swoop,”

news.yale.edu/2021/12/16/black

YaleNews · Black holes and dark matter — are they one and the same?A new model of the early universe, developed in collaboration with Yale astrophysicists, may transform our understanding of both dark matter and black holes.
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