Sagittarious A* has 'swept clean' the volume at the heart of the Milky Way galaxy, consuming those stars which were in range of its gravitational influence.
When it consumed all the nearby material it went into a 'dormant' stage.
However, supermassive black holes can be 'woken up' by intergalactic collisions, during which fresh material comes within their sphere of influence.
Synonym for "space": gap, blanc, hole, deficiency, omission, vacancy... is: "nothing"-)
When kids dream of being able to bend or stretch or pull up "nothing" to a "supermassive nothing", that consumes material, goes to sleep and can also be awakened again;-)
Wasn't there at least one episode in e.g. Star Trek?
;-)
They are bound to which doesn't prove the hypothesis is correct. The only fact is that theory does not match the observed motions.
;-)
a) A graphik only. Gimmick.
b) We would have to look at the supposed study: And would be amazed at the NON-scientific nature! Computers calculate on the basis of entered circular reasoning and misinterpretations a heap of "possibilities", LIDO e.g. over 250.000, after which any detected deviation of measuring instruments, e.g. of two mirrors, whose surface accuracy is 1.000.000.000 times larger than the signal to be measured, is calculated out in a further step according to arbitrary ideas: Noise in noise only.
It is nonsense, has nothing to do with science and research!
a) A graphik only. Gimmick.
b) We would have to look at the supposed study: And would be amazed at the NON-scientific nature! Computers calculate on the basis of entered circular reasoning and misinterpretations a heap of "possibilities", LIDO e.g. over 250.000, after which any detected deviation of measuring instruments, e.g. of two mirrors, whose surface accuracy is 1.000.000.000 times larger than the signal to be measured, is calculated out in a further step according to arbitrary ideas: Noise in noise only.
It is nonsense, has nothing to do with science and research!
I said "agreement", not "proof". Dark matter remains a hypothesis.
Perhaps you would prefer MOND, a modification of standard Newtonian dynamics and general relativity?
Both MOND and dark matter may sound like science fiction, but only by exploring such hypotheses do scientists hope to come closer to understanding the nature of the Universe.
Any hypothesis is merely a starting point for further investigation.
Gravity obeys an inverse square law with regard to distance as you must very well know.
If you are up on celestial mechanics you will also know that matter revolves around Sagittarius A* and most of it is in a stable orbit.
For example, star SO-2 is on a 16-year elliptical orbit around the supermassive black hole.
The star's closest approach is a mere 18 billion km from the black hole and that’s only four times farther from the black hole than Neptune is from our sun!
There's information here on how black holes swallow stars: https://www.astronomy.com/science/how-do-black-holes-swallow-stars/
Basically, gravitational perturbations can catapult stars out of their stable orbits directly towards a supermassive black hole.
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@planet10 (dave)
https://www.bbc.co.uk/news/science-environment-66039810
I enjoyed the live feed from NANOGrav this evening. All seemed pretty straightforward to me, I understood most of it, and it was interesting to listen to Kip Thorne (held the Feynman chair in Physics at CalTech) who is a very good physicist indeed on Gravity:
https://nanograv.org/
We now have a new field in Physics and Cosmology, which can only make more discoveries in years to come.
Not only is there an Electomagnetic Cosmic Microwave background to investigate, which takes us back to 300,000 years after the Big Bang when the Universe became transparent,
There is a Gravity Wave background too. This one was at much lower frequencies than LIGO investigates. There are further schemes planned to investigate the entire gravitational wave spectum. And I think it might even glimpse remnant of the Big Bang itself since gravity waves should go back to the year dot. Fantastic!
This is an age of wonders in Science.
https://www.bbc.co.uk/news/science-environment-66039810
I enjoyed the live feed from NANOGrav this evening. All seemed pretty straightforward to me, I understood most of it, and it was interesting to listen to Kip Thorne (held the Feynman chair in Physics at CalTech) who is a very good physicist indeed on Gravity:
https://nanograv.org/
We now have a new field in Physics and Cosmology, which can only make more discoveries in years to come.
Not only is there an Electomagnetic Cosmic Microwave background to investigate, which takes us back to 300,000 years after the Big Bang when the Universe became transparent,
There is a Gravity Wave background too. This one was at much lower frequencies than LIGO investigates. There are further schemes planned to investigate the entire gravitational wave spectum. And I think it might even glimpse remnant of the Big Bang itself since gravity waves should go back to the year dot. Fantastic!
This is an age of wonders in Science.
Wrong. Again.
We do not see any "black hole. We did never detect any "black hole". We have only the movement of some stars, whose cause is unknown.
Especially since the stars around this supposed black hole do not show any "Einstein rings".
This is nonsense! Again!
It already starts with circular closing! Are you not able to recognize circular reasoning;-?!
That you do not understand concepts is obvious by now;-)
"Scientists claim Sun made mostly of Hydrogen and Helium." Just a hypothesis, no wait, just a theory ... it's so easy to get these things confused. The Sun is way out in space, so there's no way we can know ...
Ben, waiting for Scientific Proof that Science is True. Also taking the ****.
Ben, waiting for Scientific Proof that Science is True. Also taking the ****.
In the Big Bang model, the large-scale structure of the universe is determined by a period of rapid expansion called cosmic inflation.
It is during this incredibly brief period of rapid expansion that gravitational waves would have been produced.
We would require 5 sigma proof of the direct detection of primordial gravitational waves in order to support the cosmic inflation hypothesis.
More data: https://phys.org/news/2023-06-ghost-particle-image-milky-galaxy.html
Milkyway image of the sky from capturing neutrnos
https://phys.org/news/2023-06-cosmological-built-simple-century-old-idea.html
dave
Milkyway image of the sky from capturing neutrnos
https://phys.org/news/2023-06-cosmological-built-simple-century-old-idea.html
dave
Neutrino astronomy - the new frontier of astronomy!
We no longer have to depend solely on photons of electromagnetic radiation to observe the Milky Way and beyond!
Below, the IceCube Neutrino Observatory which is located at the South Pole, with its sensors deployed in a cubic kilometre of ice!
Regarding Dave's second link, there is increasing evidence that the Universe is not homogeneous, an assumption upon which our cosmological models are based.
The European Space Agency's Euclid mission, which is set to launch, will test the assumption as it is designed to explore the composition and evolution of the Universe. The space telescope will create a great map of the large-scale structure of the Universe across space and time by observing billions of galaxies out to 10 billion light-years.
The European Space Agency's Euclid mission, which is set to launch, will test the assumption as it is designed to explore the composition and evolution of the Universe. The space telescope will create a great map of the large-scale structure of the Universe across space and time by observing billions of galaxies out to 10 billion light-years.