- Видео 13
- Просмотров 10 477 219
Ziri Younsi
Великобритания
Добавлен 16 авг 2013
Hi there - I'm delighted you've found my channel!
I'm Dr. Ziri Younsi, an astrophysicist at University College London. I'm passionate about Physics, especially black holes, gravity, and our Universe. My channel is educational and I love making videos from the calculations I perform in my day-to-day work.
My core area of research is black holes, in particular observing them and trying to understand their fundamental nature and relationship with space and time. I'm especially interested in what they look like, and work in collaborations like the Event Horizon Telescope to obtain images of the matter surrounding their event horizons.
I write and utilise my own supercomputer codes to calculate the physically accurate behaviour of radiation (light) and matter around black holes, using these to produce videos like those shown in my channel. All my channel content is entirely original and produced directly as a result of my own research.
If you have any questions, just send me a message!
I'm Dr. Ziri Younsi, an astrophysicist at University College London. I'm passionate about Physics, especially black holes, gravity, and our Universe. My channel is educational and I love making videos from the calculations I perform in my day-to-day work.
My core area of research is black holes, in particular observing them and trying to understand their fundamental nature and relationship with space and time. I'm especially interested in what they look like, and work in collaborations like the Event Horizon Telescope to obtain images of the matter surrounding their event horizons.
I write and utilise my own supercomputer codes to calculate the physically accurate behaviour of radiation (light) and matter around black holes, using these to produce videos like those shown in my channel. All my channel content is entirely original and produced directly as a result of my own research.
If you have any questions, just send me a message!
Black Hole Image Improves with Increasing Telescope Resolution
This video illustrates how a black hole image (panel on the right) can improve as the angular resolution of the array of telescopes increases. The ground truth image (left panel) shows what the black hole looks like if you had "infinite resolution". The right panel is slowly decreasing the telescope resolution from 20 micro-arcseconds (the current Event Horizon Telescope resolution), all the way down to 0.1 micro-arcseconds. These images show the radio-wavelength (1.3 mm) radiation produced by the hot plasma surrounding the black hole's event horizon.
In the future we will be able to produce much sharper images than the current "blurry" images seen, e.g., by launching telescopes into space...
In the future we will be able to produce much sharper images than the current "blurry" images seen, e.g., by launching telescopes into space...
Просмотров: 445
Видео
![What Does the Milky Way Supermassive Black Hole Actually Look Like? [4K]](http://i.ytimg.com/vi/wU3vRKczamc/mqdefault.jpg)
![What Does the Milky Way Supermassive Black Hole Actually Look Like? [4K]](/img/tr.png)
What Does the Milky Way Supermassive Black Hole Actually Look Like? [4K]
Просмотров 9 тыс.2 года назад
On May 12th 2022 at 13:00 UTC, the Event Horizon Telescope (EHT) Collaboration published the first image of the supermassive black hole in the heart of our galaxy: Sagittarius A* (aka Sgr A*). This is the first direct evidence that it is indeed a supermassive black hole which resides in the centre of the Milky Way, and the second time the EHT has resolved a supermassive black hole (the first ti...
Voyage around the black hole in M87
Просмотров 26 тыс.5 лет назад
This short movie shows the simulated image of the black hole in Messier 87 (M87), recently shown to the world by the Event Horizon Telescope (EHT) as the first ever image of a black hole. The observer is orbiting the black hole following a line of constant longitude, beginning at 163 degrees, moving towards the North pole, performing a full 360 degree rotation and ending up at the same initial ...
![Falling into a black hole (Realistic Ultra HD 360 VR movie) [4K]](http://i.ytimg.com/vi/S6qw5_YA8iE/mqdefault.jpg)
Falling into a black hole (Realistic Ultra HD 360 VR movie) [4K]
Просмотров 10 млн7 лет назад
Update: check out my latest video - the most realistic simulated movie to-date of the supermassive black hole in the centre of our own Milky Way galaxy! [ruclips.net/video/wU3vRKczamc/видео.html] On smartphones this video is best viewed using the youtube app. Try google cardboard on your smartphone with a VR headset for the most immersive experience (smartphone with gyro sensor required). For d...
Celestial Sphere Lensing Kerr a0p998
Просмотров 17 тыс.7 лет назад
Celestial Sphere Lensing Kerr a0p998
Quasi Opaque Accretion Torus around Rotating (Kerr) Black Hole
Просмотров 8 тыс.10 лет назад
Movie of a quasi-opaque, radiation-pressure dominated accretion torus which incorporates the effects of absorption, emission and scattering of radiation. Hotter regions are white, cooler, less-energetic regions are dark-red. Limb-darkening occurs at the edges of the image due to the low optical depth in this region, with photons which pass through being only weakly attenuated by the matter they...
General Relativistic Compton Scattering Kernel (zeroth order)
Просмотров 1,7 тыс.10 лет назад
Movie of the general relativistic Compton scattering kernel as a function of initial photon energy. As the energy of incident radiation becomes much greater than the relativistic electron, the range of possible scattered energies increases.
Translucent Accretion Torus around Kerr Black Hole
Просмотров 4,8 тыс.10 лет назад
Movie of a translucent, radiation-pressure dominated accretion torus around a maximally spinning (Kerr) black hole. The optical depth across the entire torus ~0.1. This calculation incorporates the effects of absorption, emission and scattering of radiation. Hotter regions are white, whereas cooler, less-energetic regions are dark-green.
Accretion Torus around Spinning Black Hole (with emission spectrum)
Просмотров 6 тыс.10 лет назад
Movie of an accretion torus around a maximally spinning black hole (main) and the corresponding calculated emission line profile (inset). The accretion torus is coloured by relative energy shift: red corresponds to radiation which has lost energy while escaping the deep gravitational potential well of the black hole, and conversely blue to radiation which has gained energy. White/gray indicates...
Congratulations, you have unlocked a new fear. Megalphobia.
@unaidossantos in you dream😐
Hey, any chance there is a source for the equations/code that generated this?
The analytic formula for the Kerr black hole shadow seen by a (formally infinite) distant observer is in many papers in the literature. A nice review of this topic is by Perlick et al. (2022): arxiv.org/pdf/2105.07101. Equations (57) parametrically define the boundary curve as seen in this video.
I think you would become surrounded by light as onlookers see you red-shift away.
This looks likes an eyeball getting bigger and bigger.
Creepy….
I don’t know about anybody else watching this but I ended up in a parallel universe.
只有這證明已足夠我的信用縱然很幻!
Absolutely, absolutely more than that, this is not the answer!
Skip to 2:12
No firewall, no venting of information
No excretion disk
This doesn’t consider the light distortion and time dilation
Time dilation wouldn’t be noticeable with no nearby fast-moving objects.
This video started my melanoheliophobia 😭
That last half of a second made me real dizzy.
nOICe
Me encantó
Thank you to Bubble Telescope! 🫶🏽
Didn’t know black hole is a belly button look alike stuff.
I peed on my pants
At what point is the crossing of the event horizon? Is it around 2:55, when the blackness starts "enveloping" the viewer?
That's right
Shouldn't the accretion disk be extremely fast?
That must have a spin and a charge to it given the wonkiness
Just spin in this video, but electric charge can make it even more "wonky" for the same value of spin (Kerr-Newman black hole).
@@ZiriYounsi Space engine does a decent job showcasing this for sure
Thanks, but i wish to see a theory that shows what actually happens after the end of your video 😄 Anyone knows a video that visualizes that?
It's scary just to see this in a screen, I imagine how scary is to see it using VR. The end got me chills
Ohkay.. it's actually kinda scary with your back turned..
but the link?
This is not realistic because there is no doppler effect "Object that 99%c fast will gonna blind but if a camera recording the front will be blue and the back will be red"
Aww that was abit scarey
Watching this on oled is terrifying
The last thing I see when someone flings me in roblox
"It is a common misconception that if you fall into the event horizon of a black hole you will be engulfed in blackness".
Soooooo no one’s gonna ask how the black hole looked EXCEPT LIKE THE BACK OF A YUGIOH CARD😂
I came to the comments to check something and it was confirmed. This shit had me feeling a sense of dread that can’t adequately be put to words😭😭
Come to think of it i dont thinl u would be able to rotate and look around so once the blackness takes ur view thats it
I was looking around at the stars (facing upside down), as I was rotating it back to the normal angle the black hole got realllly close and I started screaming NOO NOO NOOOOO realizing it was too late to turn back. And now my legs are numb from anxiety thank you
Insane expirience, try it while youre on fucking LSD
Best wel eng knap gedaan
Obviously you’d just appear in the back rooms, then the fun begins😀
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