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Old May 13th, 2022 #1
Ray Allan
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Default Supermassive black hole at Milky Way's center photographed for first time


https://www.space.com/milky-way-mons...irst-image-eht
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Old May 14th, 2022 #2
joeylowsac
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Exclamation

It is not possible to photograph a black hole.
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Old May 15th, 2022 #3
Nikola Bijeliti
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Originally Posted by joeylowsac View Post
It is not possible to photograph a black hole.
You photograph the matter surrounding the black hole. The black hole is the empty space in the middle.
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Old May 16th, 2022 #4
joeylowsac
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Originally Posted by Nikola Bijeliti View Post
You photograph the matter surrounding the black hole. The black hole is the empty space in the middle.
They're not photographing anything. Visible light is not part of the data from which that image was created. They have radio dishes all around the planet pointed at Sgr A*. The radio emissions (presumably matter ejected from the accretion disc) are what the artwork below represents. Nobody has actually seen the accretion disc any more than we can see the black hole. It is expected that the accretion disc emits visible light but our view is just obscured.



We've long been able to surmise the black hole at the centre of the galaxy based on the stars that orbit it. That was demonstrated in the 90s.

HIGH PROPER-MOTION STARS IN THE VICINITY OF SAGITTARIUS A*: EVIDENCE FOR A SUPERMASSIVE BLACK HOLE AT THE CENTER OF OUR GALAXY - https://ulozto.net/file/BouYipu9w92o...our-galaxy-pdf
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Old May 16th, 2022 #5
Nikola Bijeliti
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Quote:
Originally Posted by joeylowsac View Post
They're not photographing anything. Visible light is not part of the data from which that image was created. They have radio dishes all around the planet pointed at Sgr A*. The radio emissions (presumably matter ejected from the accretion disc) are what the artwork below represents. Nobody has actually seen the accretion disc any more than we can see the black hole. It is expected that the accretion disc emits visible light but our view is just obscured.



We've long been able to surmise the black hole at the centre of the galaxy based on the stars that orbit it. That was demonstrated in the 90s.

HIGH PROPER-MOTION STARS IN THE VICINITY OF SAGITTARIUS A*: EVIDENCE FOR A SUPERMASSIVE BLACK HOLE AT THE CENTER OF OUR GALAXY - https://ulozto.net/file/BouYipu9w92o...our-galaxy-pdf
Are you saying that that is an artist's rendering and not a photograph?
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Old May 17th, 2022 #6
George Witzgall
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Originally Posted by Nikola Bijeliti View Post
Are you saying that that is an artist's rendering and not a photograph?
It was imaged in the microwave spectrum (~1mm wavelength), not the visible spectrum, so colors were assigned to create the "photograph". If we were closer to the center of our galaxy we could probably image it in the visible spectrum, or if we constructed laser interferometers much larger than the Earth (maybe using Lagrange points). Maybe in future.
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Old May 19th, 2022 #7
joeylowsac
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Quote:
Originally Posted by Nikola Bijeliti View Post
Are you saying that that is an artist's rendering and not a photograph?
Yes, of course it is. We cannot see into the centre of the galaxy. People often misinterpret discoveries announced in astronomy and astrophysics. For example, the discovery of planets orbiting other stars. Hundreds have been discovered but nobody has ever actually seen one. The faint dimming of the star can be detected by sensitive equipment, when this happens at a regular interval we surmise that it is due to a planet in orbit.
Visible light cannot penetrate all the gasses and dust between us and centre of the galaxy but other types of radiation can and so those are used.
Many spectacular images are published in these fields but it's important to remember that the images often have more in common with art than photography.
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Old May 19th, 2022 #8
Dawn Cannon
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Originally Posted by Nikola Bijeliti View Post
Are you saying that that is an artist's rendering and not a photograph?
Some woman did it as far as I recall, I think it was made clear that it was indeed.
 
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