How Do You Observe a Black Hole?
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- čas přidán 15. 06. 2024
- Black holes may hold the key to understanding the most fundamental truths of the universe, but how do you see something that’s, well, black? Astronomers think they have the answer. Thanks to a global array of radio telescopes that turn the Earth into a giant receiver, we've imaged one black hole (Messier 87) and may soon have the first picture of the event horizon of Sagittarius A*, the black hole at the center of the Milky Way galaxy.
PARTICIPANTS: Shep Doeleman, Andrea Ghez
MODERATOR: Brian Greene
MORE INFO ABOUT THE PROGRAM AND PARTICIPANTS: www.worldsciencefestival.com/...
This program is part of the BIG IDEAS SERIES, made possible with support from the JOHN TEMPLETON FOUNDATION.
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TOPICS:
0:04 - Understanding escape velocity and black holes
9:25 - Panelist introductions
10:41 - Are black holes really out there?
12:06 - What resides in the center of our galaxy?
13:45 - Evidence of black holes
20:26 - Kek telescope experiment
24:43 - Event Horizon Telescope
32:21 - Simulating a black hole
34:27 - Will we find a deviation from Einstein’s theory?
36:24 - What's the next phase of our understanding of gravity?
PROGRAM CREDITS:
- Produced by John Plummer
- Associate Produced by Laura Dattaro
- Animation/Editing by Josh Zimmerman
- Music provided by APM
- Additional images and footage provided by: Getty Images, Shutterstock, Videoblocks
This program was recorded live at the 2018 World Science Festival and has been edited and condensed for CZcams.
Watch the full unedited program here: • Darkness Visible: Shed... - Věda a technologie
Excellent host as always Brian, fantastic guests as well. Thanks for all the efforts everyone.
Thanks for the update! Can't wait for Wednesday's photos from the EHT!
I m also desperate to see Black Hole photos
Wednesday?! MY god it feels like Christmas eve!
@BLAIR M Schirmer Sounds like you need the channel PBS Space Time. That's the real deal
I've never been so excited to see what is essentially nothing!
It's literally a re-upload.
Beautiful presentation and awesome job mixing hosting w/ keeping it tuned for a general audience.
But what does the photo of the black hole mean for the spiritual world? In my new vid, I discuss what it means for the spiritual world to see such science proven true. in my previous vid I show myself using my telekinetic and money winning powers. Please come see my new vid it will blend the line between scientific knowledge and deep occult phenomenae. Come see. I am trying to create something powerful on my page.
The Earth is obviously stuck in a time loop around a blackhole because I could swear ive seen this talk before!
Yeah stop wasting my time, I can do that by myself LOL
3 kinds ! I married the third but was lucky enough to achieve escape velocity with half my possessions.
good one mate
Funniest thing I've heard all week! Cheers!
@@anythingspossible. - thanks and cheers to you as well :)
But what does the photo of the black hole mean for the spiritual world? In my new vid, I discuss what it means for the spiritual world to see such science proven true. in my previous vid I show myself using my telekinetic and money winning powers. Please come see my new vid it will blend the line between scientific knowledge and deep occult phenomenae. Come see. I am trying to create something powerful on my page.
i love your comment especially
One photograph for mankind One step ahead for humanity
Ive been on a blackhole binge since the images have came out (i already knew the science/math) But I love watching everything about it. I cant get enough. Love it!!
Also send praise to katie a hero to women
@@findtail Why minimize her accomplishments by bringing gender into it? How about a hero to humans.
29:07 this is the latest most precise image of black hole you came here for
Thanks
Nice troll
there seems to be some guy with a laptop
Pretty funny how the event horizon telescope guy reacted. "Why would I be upset?" he said like he was about to see the host release a crappy work in progress image that got leaked by his team that apparently betrayed him in the worst way. If it was the Jerry Springer Show, that would be the chair throwing point.
I remember seeing Andrea Ghez in many documentaries from the 90's and 00's concerning black holes. I remember when that animation was still 2D and only lasted a mere 3 seconds tops. She's very committed to her work, I hope she continues to love it.
Obviously… why would someone lose the love for their job after 30-40 years? She won the nobel price too!
Actually just finished watching this before the breakthrough announcement! What a moment in history.
Congratulations Dr. Ghez! Richly deserved
Finally one with Brian!
Thanks for the amazing video Brian. You are amazing
Great BRIAN GREENE
I love this education, can never stop this "Learning thing"
Holy shit... I almost forgot about the images that are getting ready to come out of a black hole.... So much fkn awesomeness incoming!!
can you imagine having THIS MAN as your professor.... I would legit fall in love with his brain
"This is my BABY! Oh yeah!"
Ghez is so enthusiastic about her work, gotta love that
What happens in a black hole, stays in the black hole..
Rule 34 man, rule 34 ;)
Mr Briane explained much better than the other two, but well done all three, I am really inspired by the way Mr briane teaches, 👏👏👏
Very well explained thank you :)
We now know what a black hole looks like. 2019-04-10.
we don't know if it even exist. those rigged computer models they can flush them down the toilette that isn't physics or science at all
@@brianfriedman101 Silly person :0) btw, what's a 'toilette'?
@@brianfriedman101 leave then flatard. take your tinfoil hat and your dome covered horse and get lost
@@The_SCPFoundation Brian isn't wrong dude
@@razorrrnsnsj look kid, go play your fortnite quietly while adults are talking.
Yes, Brian Greene!!
Soo cool to watch this again now!!
Love the way he explained
It's so exciting, I am looking forward to see that
Bhai Bhai Bhai Brian Greene ur explanation is so brilliant...
So grateful to you Brian Green for bringing the universe into our home in india. What an extraordinary idea of having this science festival and making it possible for us to understand
Best part of video at 33:50 to 34:27 and ofcourse brian greene's awesome introduction about black holes
so excited!!!
We love you Brian
Old video but still Iove WSF :D
I watched this ages ago!
Inspirational, love it. I hope it looks like the Interstellar black Hole.
Thankyou Katie bouman
Shes making me excited!
Shep Doeleman is a very smart guy, wow
Amazing. Just wish the date, 2018, was up in the title.
... Brian is a legend ...
Wow, those 40 minutes went by quickly!
Great to see Andrea Getz on here as she was part of the team that proved Sag A star was a supermassive black hole.
Andrea Ghez is a hero.
It is very interesting
Meanwhile, some people believe the earth is a disc and there is no universe.
Brian Greene looks a lot older in this video ( 2019 ) than in his many earlier videos . He remains one of the best exponents of cosmology and science . My favourite .
Observing the behaviour of massive objects that close in towards a very small point in space, reveals black holes and their pulling power.The bright ring you see, is light slowly spinning towards the dark dense, abyss. Thus leading light to it's eventual demise, and making the mass ever more dense....Scary stuff.
THE GREAT BRIAN GREENE.
watching this, I have a few questions : 1_Does the star give away some of its light to the black hole when it comes to nearest point?, 2_How could they measure the space curve of the star getting close to the black hole as shown in the animation?
I love this guy, Brian Greene should do cosmos part 2 or at least part 3 if it’s not too late, but he expians crazy math shit so easily into the people like me!
yeah, those three guys really do the show.....
The press conference the image is apparently going to be released at is at 9am EST today. Figured I'd throw that out there in case someone wanted to watch it live.
How do they generate that 3D model? How do we know the specific axes of stars in a field of view that tiny?
These are theoretical models and there are more than one of them. Each has it's own uniqiue properties and possible elements for what the event horizon MAY look like. The models exist so when we do have an image of the EH, we'll be able to compare what we've observed with one of the models which will then give us insight into what physics are actually at play.
yey updates :) Personally id love the black holes to be doughnut formed.
Hi All to my fellow science enthusiasts.
I would if you had any content
@Enter the Bragn’ r/iamverysmart
Hi
That's dirty World Science Festival's youtube channel. I was excited for some new info relating to the Event Horizon telescope. Halfway through the silly jokes I realized, I've seen this before. This is an older talk, isn't it? Still a great talk as always though.
They just re-uploaded it, since they have a big announcement coming on the 10th. should have had something in title, or even a disclaimer in the video.
@@eancarris3850 Exactly, I thought they'd tease the April 10th results
Thank you scientists 😘😘😘😘
Great sir you are my favourite one.👍🏻🇵🇰
If light is orbiting the black hole then how can you see a siluette. Light need to escape the create that effect. Accretion discs orbiting outside the event horizon may be visible.
See the video by Veritasium which explains that. Basically light orbits around the BH pretty much like a satellite orbits around the Earth. So at the right distance, it simply goes around it and then comes back to us, so the bh is surrounded by a very weird halo of light.
5:53 are you kidding me? Actually light never crosses event horizon, as we know the light's behaviour it finds an easy way to travel, means light turns it's way when dense or less dense environment comes(diamond, water). So what happens in here is when the light reaches near the event horizon it turns it way to the side and goes with the edge, never goes inside the black hole. This is the reason of gravity lensing.
32:36 compare this simulation to the actual image. These scientists are amazing.
The light is coming to the optical telescope get focused at the focus. So here, I did not understand where the light is focusing after reflect from such a very long baseline radio telescope? (ref 31 min 12sec- 32min 20 sec)
@World Science Festival
They did it!!
Reupload? 😶
no no no
ya it is reupload
Yes reupload. I'm looking forward to wednesday.
I was having mad deja-vu watching this until I realized what was going on
Yeah
It’s coming guys. In a few days we have the picture of the black hole. Or the shadow!
I think we're going to end up with some picture of some dude in the middle of the Galaxy holding up a sign that says Just kidding! ;-)
Does the light that does not leave add to the mass of the black hole?
That black hole is camera shy, we just need to be a bit more patient :p
Is there any kind of electromagnetic attraction at all (from a super-massive black hole)?
Black holes do technically have a charge, but no - nothing that would have an effect on a macroscopic scale. It's all gravity, bent spacetime.
I would like to have "balls of light." So cool...
well, it seems fairly obvious that by now that these two separate teams have discovered evidence for new physics beyond GR. Very exciting decade ahead in astrophysics.
Here because can't wait for Wednesday.
Yo black hole smile dude. We got some pictures coming.
I think you're about 25,000 years too late
Another question is light linear, where Gravity is Multidimensional?
How do you observe a black hole? With a good heaping of skepticism.
Several immediate thoughts come new image (4/10/19)to mind:
1. Shouldn't a black hole produce an accretion disk?
2, If that IS a blurred accretion disk, shouldn't the emission be strongest on the inside edge of the accretion disk?
3. Shouldn't a black hole accretion disk be homogeneous? Some pretty large lumps there.
What I'm seeing is a plasma torus. not an accretion disk.
And if it is a plasma torus, surrounding a black hole, shouldn't the torus be brighter and hotter on the inside edge that faces the black hole?
It is not.
Relativistic beaming; look it up. it answers all your questions.
I see Brian Greene, I just click it.
Who’s here after the image of shadow of a black hole is released by EHT (event horizon telescope)
Does the black hole spin. if it does how would it spin
Thank you for talking to me like I was stupid.
dang this thumbnail is very accurate....
Mr Shep said, that the distance to that specific black hole they are studying is approx 25000 LY, and they send radio signal to that BH etc… does that mean that the radio waves needs 25000 LY to reach that BH and same amount of time to get back… is that realistic ?!!
@@rwbmal
I understand that LY is unit of distance, if you send radio waves/signals to a target (black hole) that located at "25000 LY" from you it will take 25000 years until your signal arrives there (we assume that the radio signals travels at light speed) and same amount of time to get back. My life time is not enough to see the result :-)
Event horizon equation 2chR2A=2ke^2=8*3.14*g*m^2*me*137/(pm*128.5)=ch/(2*3.14*137)+me*c^2*A/(137)^2.(k=9*10^10, e=1.6*10^-19)
Nice pic deer
wasn't the april 10th image of galaxy m87, not our own galaxy (sagitariius a)?
yes, i am confused too
Last years video, is this a recap for a new video?
the photo itself will be announced on April 10, so they reuploaded this as relevant in the near future
this a re-up? i rememeber the beginning of this from another WSF video.
edir: ok this is definitely a re-up but im assuming its a re-up because the date from the event horizon telescope is almost figured out? buddy said the first part of 2019 it could be ready and we are in the first part of 2019 lol
25000 light years ! No need to worry ! GREAT !
Three years have passed since you uploaded this video .
Now Saggi A* is going to eat up our galaxy , man ! Is it true or not ?
Please give us the latest status of this galaxy gobbling monster with real facts .
Thank you bro , God bless mankind !
Please reply to my comments in your earliest convenience .
i did not learn the space-time diagram in high school...
But time cannot be seen. What time have to do with a black hole? I understand time when it comes to distance in space
I predict that the black hole will be a highly oblate spheroid with its equator merging with the surrounding accretion disc. Thought I get that in public before the press release so I can say 'told ya so!'
OK, I was wrong.
Really needs "recorded 2018" in the title.
why
2:22 wowowo
THE FOREVER KNOWLEDGE@Y.T
You observe it by watching me
What I have questions about is the difference between Mass and Matter? Also where does gravity fit in to that?
Matter is just "stuff" that exists in spacetime, and mass is how much of this "stuff" is contained within an object or area of space. Mass is what causes curvature of spacetime, aka gravity.
@@maksphoto78 so what you are saying is Mass aka Gravity is a physical property? As well as a Dimension? Also if D is = to M/V then G/V is equivalent to Density without matter. Is it necessary to have matter to have mass?
10:09 catfished
I guess it's a cogent way to put that we're gonna watch another Nolan movie in a few years!!
This might be a stupid question, but why can't you escape the gravitational pull with a constant velocity of 1m/s or whatever?
I have an idea why universe expands for accelerating rate.
So first, There is no boundary between universe and emptiness. Universe is mountain of matter on empty space, black energy is kinetic energy from big bang and that energy which is accelerating it, is simply energy of vacuum.
When you have a vacuum, and you break the walls around it, matter rushes onto it fast. That's the black energy type 2. Type 1 is the kinetic energy from the big bang. Those 2 together make up the calculated amount of black energy in the universe. Emptiness around Universe is perfect vacuum, Universe is not, there is around 2-3 atoms on every 1 square km. Matter rushes onto the more empty space what is emptiness around Universe. You can imagine like when you have full bucket of water and you are standing on a flat surface. You pour that water onto the floor fast, it rushes in every direction from the center point where you poured it. That same thing is happening with the Universe. Big bang was that pour of water.
He is saying picture of Sagittarius A* is going to be released . Today he and his team released the picture of Balck hole at the centre of M87 Galaxy . 30:17
This probably a dumb question, but what if it wasn't spherical?
Maybe Confucius spoke of black holes when he said: ―The hardest thing of all is to find a black cat in a dark room, especially if there
is no cat‖
Or Edward James Olmos in Stand and Deliver. "You're like a blind man in a dark room looking for a black cat that isn't there."
@me hee Maybe you can point me to some evidence of your claim
@3:57 The star would also go dark if it no longer produced the spectrum of visible light. What if the power it generated from in it's core to just outside its surface was so massive that the black hole produces a spectrum of light we are not able to see with the unaided eye? The energy it produced would be so intense, like the energy the microwave produces is beyond visible light, we wouldn't be able to see. Even an X-ray machine produces a wavelength of light we cannot see. Same thing goes for radio, it is a spectrum of light that we cannot see. The reason why the star is black then would not have anything to do with gravity or mass but because of the spectrum of light it produced was beyond what we are able to see.
But what does the photo of the black hole mean for the spiritual world? In my new vid, I discuss what it means for the spiritual world to see such science proven true. in my previous vid I show myself using my telekinetic and money winning powers. Please come see my new vid it will blend the line between scientific knowledge and deep occult phenomenae. Come see. I am trying to create something powerful on my page.
your interpretation of the spectrum of light within the black hole is amazing .
Brian Greene reminds me of Bill Mahar.
If black hole is a black Star then what about singularity inside black hole?