Black hole at the center of our galaxy appears to be getting

Discussions ranging from space technology, near-earth and solar system missions, to efforts to understand the large-scale structure of the cosmos.

Black hole at the center of our galaxy appears to be getting

Postby socrat44 on September 24th, 2019, 5:09 am 

Black hole at the center of our galaxy appears to be getting hungrier
UCLA astronomers notice brightest light in 24 years of observations
/ Stuart Wolpert | September 11, 2019 /
http://newsroom.ucla.edu/releases/black ... g-hungrier
===
Attachments
black+hole+art.jpg
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015


Re: Black hole at the center of our galaxy appears to be get

Postby socrat44 on September 24th, 2019, 9:43 am 

Yeah, the ''black hole'' has a good appetite . . .
but some 26,000 light-years we can not worry . . .
===
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015


Re: Black hole at the center of our galaxy appears to be get

Postby BurtJordaan on September 25th, 2019, 1:03 am 

socrat44 » 24 Sep 2019, 15:43 wrote:Yeah, the ''black hole'' has a good appetite . . .
but some 26,000 light-years we can not worry . . .
===

It seems it has to survive on a gas only diet - nearby solids have been gobbled up long ago...
User avatar
BurtJordaan
Forum Moderator
 
Posts: 2742
Joined: 17 Oct 2009
Location: South Africa
Blog: View Blog (9)


Re: Black hole at the center of our galaxy appears to be get

Postby socrat44 on September 25th, 2019, 4:43 am 

BurtJordaan » September 25th, 2019, 1:03 am wrote:
socrat44 » 24 Sep 2019, 15:43 wrote:Yeah, the ''black hole'' has a good appetite . . .
but some 26,000 light-years we can not worry . . .
===

It seems it has to survive on a gas only diet -
nearby solids have been gobbled up long ago...



Who can know the appetite of black hole ?
And what will happen if black hole really can gobble
''gas'', ''dust'' and . . . everything around ?
#
Then, maybe, ''ENTROPY'' would watch black hole's appetite
and would not allow it to swallow all the time - everything
====
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015


Re: Black hole at the center of our galaxy appears to be get

Postby TheVat on September 25th, 2019, 9:17 am 

Re entropy - the "no hair theorem" is helpful.
User avatar
TheVat
Forum Administrator
 
Posts: 7406
Joined: 21 Jan 2014
Location: Black Hills


Re: Black hole at the center of our galaxy appears to be get

Postby socrat44 on September 25th, 2019, 9:31 am 

TheVat » September 25th, 2019, 9:17 am wrote:Re entropy - the "no hair theorem" is helpful.


Synopsis: Hunting for Hair on Coalescing Black Holes
September 12, 2019
A fresh look at data from the first detected black-hole
merger supports the “no hair” theorem and proves
the potential of black-hole spectroscopy.

https://physics.aps.org/synopsis-for/10 ... 123.111102
#
The ''hear'' or "no hair theorem" needs good Barber with Occam's razor
===
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015


Re: Black hole at the center of our galaxy appears to be get

Postby socrat44 on October 6th, 2019, 5:12 am 

Black Holes
--
Building on our pioneering work on the pivotal role of black holes
and other extended objects in fundamental theories which seek
to unify gravity and the strong and electroweak forces such as
supergravity theory, Kaluza-Klein Theory and superstring theory,
we intend to extend our study by exploring the possible solutions,
and their stability (both classical and quantum mechanical),
the implications for the duality properties of these fundamental
theories and to make predications for present and future high energy
experiments (such as at accelerators like the Large Hadron Collider
or other terrestrial searches for exotic particles), and astrophysical
and cosmological observations (such as Planck).
--
Stephen Hawking's predictions of the microscopic properties of
black holes have been confirmed within the theoretical framework of string theory
--
Another goal is to investigate the formation of black holes during
the early history of our Universe, and indeed whether our Universe
can be thought of as being inside or outside a black hole or
event horizon possibly made of dark energy.

Black holes are some of the most exotic and mysterious objects
know to physics. They are a direct consequence of Einstein's theory
of curved spacetime, which is believed to be only part of a larger,
more fundamental structure. Whatever that structure may be,
it is certain that black holes will play a central role, offering a window
on extra dimensions which may open up even greater vistas in the future.
We intend to be ready for such developments by exploring the role
of black holes and their testable consequences in non-conventional
spacetime theories.

http://www.ctc.cam.ac.uk/research/black_holes.php
=========================
Attachments
Black_ergosphere.jpg
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015


Re: Black hole at the center of our galaxy appears to be get

Postby socrat44 on October 7th, 2019, 9:04 am 

REALITY
Black hole swallowing and ripping apart star
captured for first time
The star was the size of the Earth's sun and
375 million light years away when it was seen
being drawn in by the black hole.
Friday 27 September 2019 11:58, UK

https://news.sky.com/story/black-hole-s ... e-11820432
======
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015


Re: Black hole at the center of our galaxy appears to be get

Postby socrat44 on October 10th, 2019, 1:54 am 

socrat44 » October 7th, 2019, 9:04 am wrote:REALITY
Black hole swallowing and ripping apart star
captured for first time
The star was the size of the Earth's sun and
375 million light years away when it was seen
being drawn in by the black hole.
Friday 27 September 2019 11:58, UK

https://news.sky.com/story/black-hole-s ... e-11820432
======


REALITY . . .
. . .no doubt, NASA can use computer to design
cosmological billion years effect in 1 minute
#
. . . god needed 6 days to create everything and
NASA needs 1 minute to show and explain the destruction of his work
===
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015


Re: Black hole at the center of our galaxy appears to be get

Postby socrat44 on October 20th, 2019, 11:42 pm 

Black holes stunt growth of dwarf galaxies
Astronomers find large-scale winds associated with active black holes
in small galaxies suppress star formation
Date: October 11, 2019
Source: University of California - Riverside
Summary:
Astronomers have discovered that powerful winds driven
by supermassive black holes in the centers of dwarf
galaxies have a significant impact on the evolution
of these galaxies by suppressing star formation.

https://www.sciencedaily.com/releases/2 ... 165322.htm
Attachments
B-H.jpg
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015


Re: Black hole at the center of our galaxy appears to be get

Postby socrat44 on October 22nd, 2019, 3:31 am 

socrat44 » October 20th, 2019, 11:42 pm wrote:Black holes stunt growth of dwarf galaxies
Astronomers find large-scale winds associated with active black holes
in small galaxies suppress star formation
Date: October 11, 2019
Source: University of California - Riverside
Summary:
Astronomers have discovered that powerful winds driven
by supermassive black holes in the centers of dwarf
galaxies have a significant impact on the evolution
of these galaxies by suppressing star formation.

https://www.sciencedaily.com/releases/2 ... 165322.htm

Gulliver's Travels ( 1726 - 2019 )
--
Gulliver in the land of the Dwarf galaxy
Gulliver in the land of the Giant galaxy
Gulliver in the land of the Balnibarbi
Gulliver in the land of the Yahoo
====
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015


Re: Black hole at the center of our galaxy appears to be get

Postby socrat44 on November 19th, 2019, 8:38 am 

A Black Hole Threw a Star Out of the Milky Way Galaxy
So long, S5-HVS1, we hardly knew you.
By Dennis Overbye
Nov. 14, 2019
https://www.nytimes.com/2019/11/14/scie ... y-way.html
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015


Re: Black hole at the center of our galaxy appears to be get

Postby socrat44 on November 19th, 2019, 10:24 am 

Holographic Duality Yields Breakthrough in Black Hole Physics
By Skolkovo Institute of Science and Technology (Skoltech) November 5, 2019
---
The physics of black holes remains an elusive chapter of modern physics. It is the sharpest point of tension between quantum mechanics and the theory of general relativity. According to quantum mechanics, black holes should behave like other ordinary quantum systems. Yet, there are many ways in which this is problematic from the point of view of Einstein’s theory of general relativity. Therefore, the question of understanding black holes quantum mechanically remains a constant source of physical paradoxes. The careful resolution of such paradoxes should provide us a clue as to how quantum gravity works. That is why the physics of black holes is the subject of active research in theoretical physics.

https://scitechdaily.com/holographic-du ... e-physics/
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015


Re: Black hole at the center of our galaxy appears to be get

Postby socrat44 on November 23rd, 2019, 4:31 am 

Three supermassive black holes found at center of unusual, smashed galaxy

https://www.msn.com/en-gb/news/techands ... spartandhp
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015


Re: Black hole at the center of our galaxy appears to be get

Postby BurtJordaan on November 23rd, 2019, 7:39 am 

socrat44 » 23 Nov 2019, 10:31 wrote:Three supermassive black holes found at center of unusual, smashed galaxy

https://www.msn.com/en-gb/news/techands ... spartandhp

Jackson Ryan wrote:Mammoth galaxies generally host supermassive black holes, monster black holes with about 100 million times more mass than the sun, in their center. Those black holes keep galaxies like the Milky Way in constant motion, spinning billions of stars and planets around the galactic center, like a delightful cosmic carousel.

The first sentence is OK, but the second one is more or less nonsense. The mass of the black hole in the center is such a small portion of the total mass that it has virtually no influence on the Milky Way at large. It only affects the relatively small number of stars orbiting near the central BH.
User avatar
BurtJordaan
Forum Moderator
 
Posts: 2742
Joined: 17 Oct 2009
Location: South Africa
Blog: View Blog (9)


Re: Black hole at the center of our galaxy appears to be get

Postby socrat44 on February 14th, 2020, 9:02 am 

Scenario - A
The Milky Way's Monster Black Hole Has a Cool Gas Halo — Literally
By Charles Q. Choi June 05, 2019
------
At the center of our galaxy lies the supermassive black hole
Sagittarius A*, often abbreviated Sgr A*. This giant is about
4 million times the mass of the sun and about 14.6 million
miles (23.6 million kilometers) in diameter.
---
Around Sgr A* swirls a ring of debris known as an accretion disk.
The gas within this disk experiences so much friction that it can
reach 18 million degrees Fahrenheit (10 million degrees Celsius),
according to researchers on the new study. Previous research has
detected X-rays near Sgr A*, likely given off from this hot gas.
---
Prior research suggests that Sgr A* was also surrounded by
relatively cool gas, with temperatures ranging from about
minus 280 degrees F to 17,500 degrees F (minus 170 degrees C
to 10,000 degrees C). However, it remains uncertain how much
cool gas surrounded Sgr A*.
https://www.space.com/milky-way-monster ... -disk.html
---
Scenario - B
1 - A black hole has a temperature within a few
millionths of a degree above absolute zero: T=0K
/ Oxford. Dictionary./
2 - A stellar black hole of one solar mass has a Hawking
temperature of about 100 nanokelvins. This is far less
than the 2.7 K temperature of the cosmic microwave background
http://en.wikipedia.org/wiki/Black_hole
3 - A black hole of one solar mass (M☉) has a temperature
of only 60 nanokelvins (60 billionths of a kelvin)
https://en.wikipedia.org/wiki/Hawking_radiation
4 - September 5, 2016
How cold are black holes?
by Fraser
---
The most massive black holes in the Universe, the supermassive black holes with millions of times the math of the Sun will have a temperature of 1.4 x 10-14 Kelvin. That's low. Almost absolute zero, but not quite.
A solar mass black hole might have a temperature of only .0.00000006 Kelvin. We're getting warmer.
https://phys.org/news/2016-09-cold-black-holes.html
-----
Problem
"If we want to learn about what processes are important and
not important for how a black hole gets fed, we need to know
the environment around the black hole well," study lead author
Elena Murchikova, an astrophysicist at the Institute for Advanced
Study in Princeton, New Jersey, told Space.com.
"But the contribution of cool gas on a black hole has never
been studied." Now Murchikova and her colleagues suggest
that they may have imaged the cool accretion disk around Sgr A*
for the first time. "This should help improve our understanding
of how accretion onto black holes works," she said.
https://www.space.com/milky-way-monster ... -disk.html
---------
Cold BH - ? Hot BH - ?
The problem cannot be solved without ''quantum theory of gravity''
#
What's at the Center of Black Holes?
By Zoë Macintosh June 22, 2010
---
However, no one can know for sure, because
no complete quantum theory of gravity exists,
and the insides of black holes are impossible to observe.
https://www.livescience.com/32662-whats ... oles-.html
====
Attachments
Question.jpg
socrat44
Member
 
Posts: 435
Joined: 12 Dec 2015



Return to Astronomy & Cosmology

Who is online

Users browsing this forum: No registered users and 5 guests