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RE: Black Hole eats sun
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BarkellWH
Posts: 3458
Joined: Jul. 12 2009
From: Washington, DC
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 RE: Black Hole eats sun (in reply to JasonM)
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At 9:00 AM Eastern Daylight time, tomorrow, Wednesday, April 10, scientists will hold simultaneous news conferences in Washington, DC, Belgium, Denmark, Chile, Japan, China, and Taiwan to reveal the long-awaited results of the Event Horizon Telescope. It will be very interesting to see the results.
It is things like this, the Event Horizon Telescope, as well as other like endeavors, that we should be spending our funds on. Trump's idea of returning to the moon is a waste of time, money and talent. We've done that and should be moving on to more intriguing things like Mars on the one hand and a greater understanding of quantum mechanics on the other.
Bill
_____________________________
And the end of the fight is a tombstone white,
With the name of the late deceased,
And the epitaph drear, "A fool lies here,
Who tried to hustle the East."
--Rudyard Kipling
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Date Apr. 9 2019 18:05:16
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BarkellWH
Posts: 3458
Joined: Jul. 12 2009
From: Washington, DC
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RE: Black Hole eats sun (in reply to Ricardo)
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Great posting the photos, Ricardo. What a testament to man's intellectual and technical ability to begin to really understand the universe, both at the macro level (cosmology) and the micro level (quantum mechanics). This is one big step among many, but it is huge.
Below are a couple of quotes from the website ARS Technica.
"At a press conference this morning, Avery Broderick of the Perimeter Institute described what the images tell us. One key finding is that the object is a black hole, at least as we've understood black holes using relativity. It does not have any visible surface, and the "shadow" of light it creates is circular within the limits of our observations. We can also tell that it spins clockwise. All of the properties we can infer from these images are consistent with relativity. "I was a little stunned that it matched the predictions we made so well," said Broderick.
"The University of Amsterdam's Sera Markoff said that the size of the black hole provided a new estimate of its mass; she called it "really a monster, even by black hole standards." It's roughly the size of the Solar System, but has a mass that's 6.5 billion times that of our Sun. This actually resolved a conflict between two other measures of its mass, one from the motion of gas clouds nearby, the other from tracking the stars orbiting it. This may help us refine estimates of mass for black holes elsewhere."
Great stuff.
Bill
_____________________________
And the end of the fight is a tombstone white,
With the name of the late deceased,
And the epitaph drear, "A fool lies here,
Who tried to hustle the East."
--Rudyard Kipling
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Date Apr. 10 2019 14:54:22
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BarkellWH
Posts: 3458
Joined: Jul. 12 2009
From: Washington, DC
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RE: Black Hole eats sun (in reply to BarkellWH)
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Today, 29 May 2019, marks the one hundredth anniversary of the solar eclipse that provided direct evidence of Einstein's theory of gravity laid out in his General Theory of Relativity. It confirmed that gravity was not a force acting independently across a passive space, but was a function of the warp and curvature of space-time itself.
Walter Isaacson, in his biography of Einstein, recounts an exchange between Einstein and a graduate student, Ilse Schneider, when news came that the theory had been confirmed. Schneider recalled later that at the time she asked Einstein what he would have thought if the eclipse observation had contradicted his theory. Einstein replied, "Then I would have been sorry for the dear Lord, because the theory is correct."
Bill
_____________________________
And the end of the fight is a tombstone white,
With the name of the late deceased,
And the epitaph drear, "A fool lies here,
Who tried to hustle the East."
--Rudyard Kipling
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Date May 29 2019 13:50:49
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Ricardo
Posts: 14797
Joined: Dec. 14 2004
From: Washington DC
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RE: Black Hole eats sun (in reply to BarkellWH)
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quote:
ORIGINAL: BarkellWH
Today, 29 May 2019, marks the one hundredth anniversary of the solar eclipse that provided direct evidence of Einstein's theory of gravity laid out in his General Theory of Relativity. It confirmed that gravity was not a force acting independently across a passive space, but was a function of the warp and curvature of space-time itself.
Walter Isaacson, in his biography of Einstein, recounts an exchange between Einstein and a graduate student, Ilse Schneider, when news came that the theory had been confirmed. Schneider recalled later that at the time she asked Einstein what he would have thought if the eclipse observation had contradicted his theory. Einstein replied, "Then I would have been sorry for the dear Lord, because the theory is correct."
Bill
I often come across the topic of grand unification.... referring to running the cosmic movie backward in time such that in the earliest moments after the Big Bang event, the 4 known “forces” recouple together and appear to be a single force. This apparently works neatly for strong nuclear force, the weak force, and the electromagnetic force....but the comparative weakness of gravity makes it stand off from the others. Theorists looking for clues focus on the need for forces to use bosons to exchange force info between locations (gluons for atomic nucleus, W and Z for weak interaction, photons for electromagnetism), so they hope that a discovery of a ”graviton particle”, might lead us toward unification if the thing can fit into the standard model framework.
But it always confused me why they need to do this at all if GR reveals gravity to be a curvature of space response to presence of massive objects, rather than a “force”. If the sun disappeared magically, spacetime snaps back flat with a wave that propagates at the speed of light, no need or even time for gravitons to be exchanged in some way to make this happen. Earth orbit changes instantly as we see the sun blink out 8 minutes after the last emitted photon reaches us because the gravity wave hits us at the same precise moment So unless I am miss understanding the supposed graviton interaction (I am sure I am), I don’t see a point to trying to unify gravity at all. If anybody could explain it clearly that would be great! Meanwhile I believe the dark matter problem and this unification problem to be directly related (the reason both are elusive is due to the same misunderstanding about GR).
_____________________________
CD's and transcriptions available here:
www.ricardomarlow.com
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Date May 30 2019 13:50:32
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BarkellWH
Posts: 3458
Joined: Jul. 12 2009
From: Washington, DC
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RE: Black Hole eats sun (in reply to BarkellWH)
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The Nobel Prize for physics was announced today and was shared by three physicists for work on black holes.
From the Washington Post:
"An American astrophysicist, Andrea Ghez, was among three scientists awarded the Nobel Prize in physics on Tuesday for her role in discovering a supermassive black hole at the center of our galaxy. Ghez, 55, shared the honor with German astrophysicist Reinhard Genzel, who was also cited for his work on the galactic black hole, and with Roger Penrose, a British mathematical physicist cited for his discovery that Albert Einstein’s theory of general relativity predicts the formation of black holes."
Bill
_____________________________
And the end of the fight is a tombstone white,
With the name of the late deceased,
And the epitaph drear, "A fool lies here,
Who tried to hustle the East."
--Rudyard Kipling
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Date Oct. 6 2020 15:58:56
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