Black Holes and Galaxies: Professor Reinhard Genzel
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- Опубліковано 8 бер 2010
- Evidence has been accumulating for several decades that many galaxies harbor central mass concentrations that may be in the form of black holes with masses between a few million to a few billion time the mass of the Sun.
In this public lecture, Professor Genzel discusses measurements over the last two decades, employing high resolution infrared and radio imaging and spectroscopy on large ground-based telescopes that prove the existence of such a massive black hole in the centre of our Milky Way, beyond any reasonable doubt. These data also provide key insights into its properties and environment.
Future interferometric studies of the Galactic Center black hole promise to be able to test gravity in its strong field limit. Professor Genzel also briefly summarizes the cosmological evolution of massive black holes.
This event is brought to you by the Australian Institute of Physics and the Black Hole Society, and took place on Monday 27 July 2009.
I love professor Genzels lectures!
Great lecture from a major contributor in this field.
This is such a great lecture by a great mind. As a layman, I appreciated not only the historicity but the epistemological data on modern astrophysics. Thanks, ANUchannel
my right ear enjoyed this video
That was a great lecture
Very good lecture.
Fantastic lecture. The universe is indeed a most wondrous place - who needs a deity!
Excellent lecture, I really enjoyed it and thx for sharing :) "in support of open/free teaching knowledge"
Amazing science. Excellent talk.
That is a great lecture. For the first time, I can have now a general picture of the universe.
I should probably offer myself the chance to study a book on relativity and quantum physics.
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My volume is at maximum and I can barely hear it.
I have an obvious question. If it takes light 25,000 years to reach the center of the galaxy, and he states that the camera's x-rays "penetrate" through the mass dust that blocks our view, in order to take a picture...Then, how long does it take to get a picture? Is the "black hole" simply sending out x-rays and the camera is just picking that up, or is the camera actually sending out x-rays that penetrate the clouds?
what an adorable professor. sadly, i'm going to a community college so i don't get to learn about black holes there :(
Great lecture, I love science!
I would love to use my 3d and Animation skills to help make scientific and historical documentaries.
That's why truth is stranger than fiction.
Why Im receiving only one audio channel? Mono.
black holes in the kitchen-hmmm-this sounds interesting!! :)
I like how he calls galaxies milky ways.
Does the sample size of visible stars increase with distance, so that nearby quasars are fewer just because there's more of everything the further away you look?
My left ear is lonely.
@SkunkHunt Did you watch the whole video? He very clearly presented the evidence.
@Pepsifx357 x-rays are a very energetic version of the same sort of radiation that makes up light. Astronomers use things like the Chandra space telescope to to just pick them up. Like photographing the light from a star, only the photons are moving with much higher energy. They move at the same speed as visible light , but they are just more energetic, these energetic photons vibrate faster, so they are higher frequency than visible light.
Or...maybe we just don't know much. Science has only ever been about models, model dependant realism. At least scientists admit where 'knowledge' ends, unlike all the alternatives. So it seems it's the best we have, albeit flawed, but the flaws are always tried to be ironed out in as definitive a way as possible.
It is not necessary for a galaxy to have a black hole at its center. There likely are many galaxies with supermassive black holes in their center though.
THERE IS WHERE bush is going to live in the blackholeee
Physicists are so sophisticated I'm sure most would look at me funny if I said that any self-respecting theory of quantum gravity would base all gravitational effects entirely on gravitational field quanta. Even funnier, I suppose photons are continuously re-aimed by interaction with gravitons, maybe because I like my gravitons very weak, pointlike (very long though), densely-packed and in very continuous supply at all times, while I prefer seeing photons as stronger shorter less-focused points.
i'm just a 14 year old boy and all i wana know is .... are black holes dangerous?why?
Andromeda is M31, not M33
@Pepsifx357 Light must come to us first, so... how fast radiation travels?
Let me guess, another german astronomer am I right? It's weird how our country's educational system went down the drain so fast, I had to be away from school for 5 years to finally realize how much potential I have.
@SkunkHunt Black hole are a them selves not observed. They were a theoretical by product of the laws of gravity. But if you bothered listening, then he actually told you where the evidence were found. Quasars can so far only be explained by the existence of black holes.
I love Michio Kaku but that's messed up man
Like most species on Earth the internet troll requires substance to survive...DON'T FEED THE TROLLS!!
Both top comments have basic errors. Surprising, given the nature of the vid.
This is not proof of black holes, just speculation. Where is the actual evidence?
fiction my ass
dissapointingly low number of views