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Dean Roddey wrote: Black holes have a planar accretion disc. It's not a globe around it, it's a flat disc around it,
Yes, and there's nothing else around a black hole for billions and billions of miles; it's just completely empty space -- and there's especially nothing colliding and giving off light and heat.
So it's no wonder it looks exactly as they decided it would -- a perfect circle, because black holes will always be perfectly perpendicular to our angle of view.
I wanna be a eunuchs developer! Pass me a bread knife!
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That's incorrect. The black holes being discussed here are at the center of galaxies. There is always material falling into these black holes. It's just a matter of how much, which changes over time. In the case of M87 it's VERY active, so there's lot of dust and other material falling into it, so it will have a very bright accretion disk.
The material in that disc isn't 'colliding' it's spiraling in, getting faster and faster as it gets closer to the horizon, which generates immense amounts of energy. Once it hits the horizon of course we don't see anything else from it. But, until then, it's enormously energetic, with the material reaching speeds of a substantial percentage of the speed of light.
That spiraling in creates a planar accretion disk which absolutely does matter as to the orientation relative to the observer. It also controls the direction of jets ejected from the black hole, which are perpendicular to the disc when they occur. M87 has enormous jets spewing out through the galazy from the black hole. And, if you look at the direction of the jets, it would agree very well with image in terms of orientation of the disc.
So, anyhoo, your understanding of the physics involved is just not right.
Explorans limites defectum
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Dean Roddey wrote: So, anyhoo, your understanding of the physics involved is just not right.
That's exactly what I was going to say to you.
I suggest you think a bit more carefully about what the immediate region surrounding a black hole would look like, rather than just believing the "absolute truths" that astronomers would have you believe.
I wanna be a eunuchs developer! Pass me a bread knife!
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What exactly would that be? I think you misunderstand the distinction between a black hole and the singularity inside it. What we call a black hole is just the area inside the event horizon. No, there's not really 'stuff' inside that event horizon, but that makes no difference for what we are talking about here. The gravitational influence of the black hole DOES extend beyond the event horizon. Gravity is neither energy nor mass, so it isn't stopped at the horizon. It extends outwards just as the earthy's gravity extends beyond its surface.
Material falling into the center of the galaxy will be pulled into an accretion disc around the horizon, just as it would if it were falling onto a planet's surface.
Explorans limites defectum
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Dean Roddey wrote: Material falling into the center of the galaxy will be pulled into an accretion disc around the horizon
Indeed.
Now think "when?"
I'm sure you'll get there in the end.
I wanna be a eunuchs developer! Pass me a bread knife!
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You know that just making vague statements doesn't make you right? You claim they are idiots but you provide absolutely no justification or counter argument. If you think I'm wrong, say why. Otherwise you are just wasting everyone's time.
If you are saying that material doesn't fall into the center of galaxies, that's an utter lack of understanding of the dynamics of galaxies. They are chaotic, though immensely slow about it by our standards. There are interactions between bodies all the time. Some gain from those interactions and some lose. Those who lose will fall to lower orbits because they are going slower. Over time this happens enormous numbers of times and material cycles down into the center.
Of course the other big way it happens is from collisions. All larger galaxies have lots of dwarf galaxies and globular clusters in orbits around them. Those often pass through the plane of the galaxy. Every time they do they tend to get pulled apart more and more and that material can fall into the center of the galaxy.
In super-massive elliptical galaxies like M87, it has almost certainly gobbled up not just small galaxies but other fairly large ones over time. That process provides enormous amounts of material for the central black hole, over long periods of time (by our standards anyway.)
Explorans limites defectum
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Please tell me you do not believe in the Flat Earth nonsense going 'round.
The difficult we do right away...
...the impossible takes slightly longer.
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Richard Andrew x64 wrote: Please tell me you do not believe in the Flat Earth nonsense going 'round.
Well, I'm careful whenever I go to the end of the b;lock to make sure I don't fall off and I wondered how I stuck to the earth when I was in the southern hemisphere. I've even been to the equator and didn't see any curving of the sidewalk.
CQ de W5ALT
Walt Fair, Jr., P. E.
Comport Computing
Specializing in Technical Engineering Software
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Richard Andrew x64 wrote: Please tell me you do not believe in the Flat Earth nonsense going 'round.
I heard Flat Earth believers had a meeting recently...they came from all corners of the globe...
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Richard Andrew x64 wrote: Please tell me you do not believe in the Flat Earth nonsense going 'round.
What, so there are only two options?
0. Believe every bit of the bullsh1t that astronomers try to pass off as indisputable fact.
1. You're a flat-Earther.
Take a reality check.
I wanna be a eunuchs developer! Pass me a bread knife!
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That's not my position at all.
I believe there is only one choice: real science.
But I do not wish to offend you, so I will not pursue a debate.
The difficult we do right away...
...the impossible takes slightly longer.
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The thing is that for the last five decades I've watched these people come up with bright idea after bright idea, and great discovery after great discovery, every time declaring that everything they say is the absolute truth, and almost every time backing away from the idea later -- after real scientists (i.e. Physicists, not stargazing speculators and con-men seeking acclaim and grants) have proven them wrong.
Exoplanets and photos of black holes are only the latest in a long, long series of claims.
Fool me once, shame on me; try to fool me 700 times, take a hike.
I wanna be a eunuchs developer! Pass me a bread knife!
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Scientists NEVER say they have the absolute truth, at least not any real ones. You get your facts from popular media which always overplays these things, always. The reason that science is so powerful and basically has given you pretty much everything you have is BECAUSE it doesn't consider anything absolute. It only has degrees of certainty and error bars. Unlike dogmatic systems, there's nothing in the world a young scientist would want to do more than overthrow some long standing theory.
Though of course these days they are never actually overthrown, not the ones that have been well tested. Long years of hard core tests that pass prove that a theory has predictive power. But, it may only have that power within a particular set of conditions that we can currently test. Go beyond that, and you may need something more. But that something more isn't going to suddenly make all those measurements invalid. That theory will just subsume the old one.
For instance, Einstein didn't invalidate Newtonian physics. The vast majority of the world and even space travel still uses Newtonian physics and it works perfectly well. What changed was the mental model of what causes gravity, and that new model works at speeds and gravities that Newtonian physics doesn't.
At some point, there may be a new theory that subsumes general relativity, but it won't make relativity invalid, it will just provide a new mental model that deals with an even broader realm of conditions. But no one can assume it is the ultimate one.
One thing that confuses many people who don't get science is that science has two big branches. One is figure out the ultimate roots of reality type stuff, and the other is get stuff done. The latter (and bigger) branch only requires that the model work very accurately, not that it represent the ultimate explanation of reality. Theories are validated based on how accurately they predict what will happen for the most part, not based on more metaphysical concerns.
The folks who are trying to figure out the ultimate roots of reality are not in the same sort of business. They can't really test their theories in many cases, which means it's not science in the strictest sense. And they can't run tests, they can only examine the one universe we have. It's a very tough row to hoe, since they don't have many of the tools that would normally be available to scientists.
Explorans limites defectum
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Dean Roddey wrote: Scientists NEVER say they have the absolute truth, at least not any real ones.
Exactly.
I wanna be a eunuchs developer! Pass me a bread knife!
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You just assume that when a paper is reported by the popular press that this is a claim by the folks involved that it's an absolute truth. But it never is.
Explorans limites defectum
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I'm not the person in this discussion who is making gross assumptions, and I'll thank you to stop making them about other CP members.
I wanna be a eunuchs developer! Pass me a bread knife!
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Well you clearly didn't get these ideas from reading the actual papers, or you'd not be making such incorrect claims. The only place you get that kind of misinformation is from the popular press, or wingnuts who aren't part of the respectable scientific establishment.
Explorans limites defectum
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So, science being what it is, do share your research papers. I'm sure those who actually do it for a living are anxious to read your alternatives and are standing by to replace their current understanding of the universe with what you've come up with.
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Yeah - been going on since Galileo. The fool claimed that Copernicus was right about the earth going around the sun. Luckily, at the time, the church was able to get him to recant his foolish lies.
| Ravings en masse^ |
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| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "If you are searching for perfection in others, then you seek disappointment. If you are seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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When I'm falling from the sky after all the engines exploded on my plane due to an alien reptilian firing laser beams from it's eyes after hitching a ride on an Earth Killing asteroid (OK, so my nightmares are fairly specific - I'm a programmer, it's who I am) then the thing I'll be cursing at, apart from the indignity of missing the end of "A Star is Born" on that tiny seat-back screen, is that I will have died before they work out what's causing the acceleration of the universal expansion. Or indeed: if it's really expanding (Cue dramatic music)
So yes, that makes me sad that you feel that way too.
cheers
Chris Maunder
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In your dream, why did you, as a programmer have to creater an instance. Better to leave it abstract.
CQ de W5ALT
Walt Fair, Jr., P. E.
Comport Computing
Specializing in Technical Engineering Software
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Whereas the bowl of petunias falling beside you will just be thinking, "Not again!" 
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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That would pretty much be me. I don't think I'm the waving-the-tail-around happily type in that situation.
cheers
Chris Maunder
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Not several, around one billion years younger. It's a valuable opportunity to claim that science has it wrong and as bible says the universe is 12 thousand years old with a flat earth at the center.
modified 20-Oct-19 21:02pm.
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Urban Cricket wrote: Not several, around one billion years younger.
Oh, is that all? 
Social Media - A platform that makes it easier for the crazies to find each other.
Everyone is born right handed. Only the strongest overcome it.
Fight for left-handed rights and hand equality.
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