BH has gone quiet.

EEPhil said:
I couldn't make sense of the programme. Whatever points the contributors were making went over my head. I wonder who the target audience was for this episode. Other PhDs in Astrophysics?
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Apart from dozing off, I had no significant complaints (a couple of minor misrepresentations perhaps) – but then I am familiar with the background.

Brief summary: the JWST (James Web Space Telescope, which images the deep infrared and therefore heavily red-shifted objects near the dawn of the Universe) has found a class of object ("red dots") nobody expected, using the gravitational lensing of galaxy clusters in the foreground to detect things that wouldn't otherwise be detectable. The characteristics of these red dots suggest they are massive black holes surrounded by just gas, with no associated galaxy as would be the case in the more recent Universe.

The discussion largely related to how such things could exist in the early Universe, because the "traditional" explanations for black hole formation would not have had time to do it. The professor at Edinburgh had developed some simulations which showed how the expansion of the early (compact) Universe could give rise to concentrations of gas sufficient to develop black holes, but with turbulence preventing star (and therefore galaxy) formation.

It seems to me the presenters chosen were designed to appeal to Gen Alpha, and perhaps get them interested in pursuing science education. Piercings and tattoos turn me off.
 
EEPhil said:
they gave me the impression that what explanation they thought they had has fallen apart. Not sure about the new theory.
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Not really – just that a simulation is not proof, only plausibility. More evidence is required before it can be elevated to theory.
 
Black Hole said:
Apart from dozing off, I had no significant complaints (a couple of minor misrepresentations perhaps) – but then I am familiar with the background.

Brief summary: the JWST (James Web Space Telescope, which images the deep infrared and therefore heavily red-shifted objects near the dawn of the Universe) has found a class of object ("red dots") nobody expected, using the gravitational lensing of galaxy clusters in the foreground to detect things that wouldn't otherwise be detectable. The characteristics of these red dots suggest they are massive black holes surrounded by just gas, with no associated galaxy as would be the case in the more recent Universe.

The discussion largely related to how such things could exist in the early Universe, because the "traditional" explanations for black hole formation would not have had time to do it. The professor at Edinburgh had developed some simulations which showed how the expansion of the early (compact) Universe could give rise to concentrations of gas sufficient to develop black holes, but with turbulence preventing star (and therefore galaxy) formation.

It seems to me the presenters chosen were designed to appeal to Gen Alpha, and perhaps get them interested in pursuing science education. Piercings and tattoos turn me off.
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They should have Dr. Becky (Rebecca Smethurst) from youtube presenting that, she's an expect on black holes. And she has been on Sky At Night before, Christ Lintott was her Phd supervisor.
 
Owen Smith said:
They should have Dr. Becky (Rebecca Smethurst) from youtube presenting that, she's an expect on black holes. And she has been on Sky At Night before, Christ Lintott was her Phd supervisor.
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She got any piercings?

Was just fiddling with black holes

Apparently when 2 collide in a spiral, when close enough they are enveloped by a 3rd event horizon whilst each hole still has its EH.

Even more astounding, consider this: 2 holes of 40 solar masses orbiting each other at 1 AU distance. How long before they collide?
4 trillion years
 
SemiRamis said:
She got any piercings?
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Dr. Becky has no visible piercings apart from normal ear piercings. No visible tattoos either.
SemiRamis said:
Even more astounding, consider this: 2 holes of 40 solar masses orbiting each other at 1 AU distance. How long before they collide?
4 trillion years
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Doesn't the answer vary depending on their relative velocities and any other gravitational attractors? Or are the starting assumptions that they are stationary 1AU apart in an empty universe? EDIT: it's possible the fact they are orbiting each other specifies the velocities, but you haven't said whether the orbits are circular or highly eccentric etc.
 
Owen Smith said:
Dr. Becky has no visible piercings apart from normal ear piercings. No visible tattoos either.

Doesn't the answer vary depending on their relative velocities and any other gravitational attractors? Or are the starting assumptions that they are stationary 1AU apart in an empty universe? EDIT: it's possible the fact they are orbiting each other specifies the velocities, but you haven't said whether the orbits are circular or highly eccentric etc.
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circular orbits

did you peek at the answer?
 
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