Black Holes part 2

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Message 1404890 - Posted: 19 Aug 2013, 0:30:10 UTC - in response to Message 1380794.  

Strange...


Strange, Pulsating Star Found


A strange, pulsing star has revealed a powerful magnetic field around the giant black hole at the heart of Earth’s Milky Way galaxy, scientists say.

The finding may help shed light on how the galaxy's supermassive black hole devours matter around it and spits out powerful jets of superhot matter, the researchers added.

__________
The universe wastes nothing, it's simply transferred.
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Message 1409531 - Posted: 29 Aug 2013, 21:48:11 UTC - in response to Message 1404890.  

Every galaxy has one. Earth has a super massive one.


http://www.nasa.gov/mission_pages/chandra/multimedia/black-hole-SagittariusA.html#.Uh-7-3-ZvSc

Supermassive Black Hole Sagittarius A*

The center of the Milky Way galaxy, with the supermassive black hole Sagittarius A* (Sgr A*), located in the middle, is revealed in these images. As described in our press release, astronomers have used NASA’s Chandra X-ray Observatory to take a major step in understanding why material around Sgr A* is extraordinarily faint in X-rays.
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Message 1409610 - Posted: 30 Aug 2013, 1:38:45 UTC

I believe in Karl Schwarzschild radii.

Funny thing about this subject is that the math is taken on faith. Now don't get all worked about this people. Take a deep breath...

The math in my opinion is correct. The story that is around the math is sound logic. But you believe, as I do in something you cannot see and you believe this because of logic and a faith.

Your belief system is no different than mine.


Must not conflict resolve by suggesting that someone should go sit on an ice pick...
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Message 1409618 - Posted: 30 Aug 2013, 2:50:00 UTC
Last modified: 30 Aug 2013, 2:53:38 UTC

Black holes are not a matter of faith. They are predicted by Einsteins theory of general relativity. Although long before that it was discussed that light would not be able to escape objects with large gravity fields, if I remember correctly Laplace was involved but I cannot remember the other person. I remember Laplace was involved because I have had reason to look at Laplace and his transforms along with Fourier transforms.
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Message 1409730 - Posted: 30 Aug 2013, 10:53:18 UTC

Black holes are one of the few phenomena in the Universe we're able to explain a bit even though they still remain a big mystery...
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Message 1409789 - Posted: 30 Aug 2013, 14:53:46 UTC - in response to Message 1409783.  

i still only see a big-giant-mega sun there
no black hole



I think that's because a black hole isn't really visible to the naked eye, no? ;))
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Message 1409839 - Posted: 30 Aug 2013, 16:25:39 UTC - in response to Message 1409789.  

i still only see a big-giant-mega sun there
no black hole



I think that's because a black hole isn't really visible to the naked eye, no? ;))

It isn't visible at all. It is deduced by what goes on around it. Yes? ;-)
Must not conflict resolve by suggesting that someone should go sit on an ice pick...
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Message 1409846 - Posted: 30 Aug 2013, 16:48:26 UTC - in response to Message 1409839.  

i still only see a big-giant-mega sun there
no black hole



I think that's because a black hole isn't really visible to the naked eye, no? ;))

It isn't visible at all. It is deduced by what goes on around it. Yes? ;-)


It is visible using different spectrums outside what the human eye can see - so Julie was accurate in her statement.
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Message 1409865 - Posted: 30 Aug 2013, 17:43:07 UTC

It is not. The singularity/blackhole is not. What you see is going on just outside of event horizon. This is a true and accurate statement.
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Message 1409867 - Posted: 30 Aug 2013, 17:48:36 UTC - in response to Message 1409865.  

It is not. The singularity/blackhole is not. What you see is going on just outside of event horizon. This is a true and accurate statement.


But you can clearly see the object within the activity just outside of the event horizon. It is literally a "black hole".
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Message 1409878 - Posted: 30 Aug 2013, 18:16:30 UTC

Hawking Radiation should be detectable in time.
If a "Black Hole" can evaporate then it's not completely cut off from the rest of the universe.
It's true that i can't do the mathematical derivation of a Schwarzschild Radius
or Hawking Radiation from first principles but years of crossing bridges,
going up in elevators, flying in planes tells me that science and mathematics are a good place to put your faith.
The same can not be said for Astrology, Ouija boards, Religions/Scientology and other science wannabes.
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Message 1409901 - Posted: 30 Aug 2013, 19:42:17 UTC - in response to Message 1409867.  
Last modified: 30 Aug 2013, 19:44:16 UTC

It is not. The singularity/blackhole is not. What you see is going on just outside of event horizon. This is a true and accurate statement.


But you can clearly see the object within the activity just outside of the event horizon. It is literally a "black hole".


The singularity/blackhole is smaller then an atom. You do not see the singularity/blackhole. You do not even see the event horizon. What you see is what is going on just outside of the event horizon, this is just a fact.

Thank you for your time in this matter...
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Message 1409909 - Posted: 30 Aug 2013, 20:01:37 UTC

The singularity/blackhole is smaller then an atom.


Where did you get idea?
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Message 1409915 - Posted: 30 Aug 2013, 20:18:52 UTC - in response to Message 1409901.  

It is not. The singularity/blackhole is not. What you see is going on just outside of event horizon. This is a true and accurate statement.


But you can clearly see the object within the activity just outside of the event horizon. It is literally a "black hole".


The singularity/blackhole is smaller then an atom. You do not see the singularity/blackhole. You do not even see the event horizon. What you see is what is going on just outside of the event horizon, this is just a fact.

Thank you for your time in this matter...


I believe you're splitting hairs here. We can see the accretion disk around the event horizon which contains a black hole at it's center by using tools that help us see things outside the human spectrum. Ergo, for all intents and purposes, we can see black holes.
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Message 1409917 - Posted: 30 Aug 2013, 20:24:02 UTC - in response to Message 1409909.  

The singularity/blackhole is smaller then an atom.


Where did you get idea?



When I teach; I like to be as correct as possible. To do other wise is a disservice to the person and a lie by me even if unintentional. So when I speak I bother to do some research. I am human and from time to time I am very wrong. But not today.
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Message 1409920 - Posted: 30 Aug 2013, 20:26:41 UTC
Last modified: 30 Aug 2013, 20:27:50 UTC

So you are just thinking?

As usual it is assumed that science is best obtained by means of facts based on observation.

Still, we are hypothesizing about different things and in many cases this way of doing things also shows out to be true.

One example: During a total eclipse of the sun in 1919 the position of the other star close to the disc of the sun showed up in a slightly different position than else, which proved one of Einstein's theories that gravity bends light.

Therefore the human brain is the winner even though we may also get it wrong at times as well.
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Message 1410017 - Posted: 31 Aug 2013, 4:08:09 UTC

So you base your knowledge on non-rotating Black Holes. But can there ever be a non-rotating Black Hole?

All Black Holes start as stars.

All stars spin.

Therefore Black Holes will have spin.

And like ice skaters, as a spinning object gets smaller it spins faster.

So do we know what the size of the object at the centre of a Black Hole actually is?
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Message 1410029 - Posted: 31 Aug 2013, 5:03:33 UTC - in response to Message 1410017.  

So do we know what the size of the object at the centre of a Black Hole actually is?

At what time and in what time frame?

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Message 1410030 - Posted: 31 Aug 2013, 5:13:41 UTC - in response to Message 1409909.  

The singularity/blackhole is smaller then an atom.


Where did you get idea?

Someone seems to be conflating the concepts of a "black hole" and a "singularity".
Me thinks he understands nothing.
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Message 1410043 - Posted: 31 Aug 2013, 6:43:16 UTC - in response to Message 1410030.  

Black holes of stellar mass are expected to form when very massive stars collapse at the end of their life cycle. After a black hole has formed it can continue to grow by absorbing mass from its surroundings.

http://en.wikipedia.org/wiki/Black_hole
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Message boards : Science (non-SETI) : Black Holes part 2


 
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