The Physics of Black Holes - with Chris Impey

[@Incognito-vc9wj]

THIS is how you give a lecture. No lip smacking and “uuhh’s”. Well done, concise and understandable. Thankyou!

[@Xeno426]

Well, except for that smack at 21:45. :P

[@Spaethon]

Thank god the braindead liberals stayed home.

[@tecwynjones6532]

@@Spaethon What do the Liberals have to do with this?

[@TravelerVolkriin]

@@Spaethon Lol. He literally teaches at my school, a very liberal university.

[@ericgraham8150]

@@Spaethon This comment also falls pretty flat when you consider that the majority of scientist and smart people swing liberal / democrat.

[@Madchuck42]

"Research is what i do, when i don't know what to do" I'm currently unemployed watching this at 5am!! love it!!!!

[@aaron8kok]

Hey me too,dont have a job but I know alot about black holes.

[@Brian.001]

@@aaron8kok You two should be getting some sleep, so that you can get out there later and job-hunt!!

[@aaron8kok]

@@Brian.001 thanks skip will do.

[@aaron8kok]

@frankos rooni I found one lol a good one too,unfortunately nothing to do with black holes oh well🤷‍♂️

[@MarsLonsen]

5:35 and unemployed😆

[@glarynth]

I feel like I've watched enough videos about black holes by now, but somehow they keep pulling me in.

[@TheRoyalInstitution]

We see what you did there.

[@SuperYtc1]

It’s an inescapable addiction.

[@SlinkiestTortoise23]

Robert Price If you’ve watched that many videos and understand the subject matter you must be extremely bright!

[@MrGodofcar]

Plasmoids exist, not black holes.

[@xebek]

@@MrGodofcar Erm, plasmoids and black holes aren't remotely similar phenomenon. Why are plasmoids relevant here?

[@alphacenturi8038]

You are a born lecturer. At last I have stumbled on someone I can listen to learn and understand astronomy.

[@jeffreytaylor9682]

you didnt stumble.

[@alphacenturi8038]

@@jeffreytaylor9682 Correct I tumbled.

[@mushkamusic]

Chris Impey has a gift for conveying information. Granted there's no math here , but the concepts are dealt with in such a way as to make them completely accessible. What a fantastic lecture, and what a fantastic lecturer.

[@bennymarshall1320]

You would not understand the math anyway

[@BillAnt]

You know, I was just thinking the same... a true "science professor" with great presentation skills with a dash of humor sprinkled in there. :)

[@a_diamond]

@@bennymarshall1320 the best way to learn a new language is exposure, and math is a language. Also, you don't know what people's level of understanding is or isn't. I would love to see the math on this.. as would others, obviously..

[@a_diamond]

Look for Walter Lewin's lectures. He *does* go into math ;)

[@bennymarshall1320]

@@a_diamond Math is not a language, as much as you might like it to be. Have you ever met a six year old becoming competent at math? It is a series of logical operations. Just because it is written down and it is not English does not make it another language.

[@Deathadder90]

I love how he uses such rare words in almost a nonchalant manner, yet I have to go and google these words to see the intricately layered meaning behind them. Blasé, quiescent.. to name a few. This man is a treasure!

[@wiseguy8828]

Well...the best communicators use plain language. Otherwise they’re showing off and it gets in the way of the ideas. But I give this guy a pass.

[@BlastinRope]

Those arent rare words, public education has failed you. Purposefully left you dumb so that you will be unable to resist.

[@barrygreen4202]

Good luck finding it now but Chris Impey's Essential Astronomy series of lectures is one of the modt fascinating things ive ever seen

[@TheSimonScowl]

www.youtube.com/

[@wiseguy8828]

@@TheSimonScowl I’ve heard of this web site.

[@seraphik]

fantastic lecture. also, that's the first time I've seen Hawking's grave. what an absolutely perfect, badass tribute - and such a flex, that you're so synonymous with black holes that you get to put one on your headstone.

[@artoffugue333]

This is easily the best lecture I've seen on black holes... and more. I think it's because it's easy to understand!

[@antonystringfellow5152]

It's also the only video I've seen where the presenter doesn't claim to know more than is known. I was considering the possibility that nothing exists inside a black hole before I watched this, after thinking of the problem of time dilation at the event horizon, and this guy is the first I've ever heard mention it as a possibility. The thing is, time pretty much stops at the horizon, at least from our perspective, so how has anything had time to fall beyond the event horizon? Doesn't make sense, does it? I suspect everything that's ever fallen into it is on a two-dimensional surface. Maybe there is no "inside" as such. Great talk anyway!

[@V3rP]

@@antonystringfellow5152 He did make some bold claims though. Most notable at the end with the assumption that the heat death of the universe is correct.

[@siryoda200]

This will be forever one of the most amazing videos on KZbin. The "holy crap" value is completely off the chart!

[@Dr10Jeeps]

Like others have said, I hate when I start watching these RI talks late at night. I end up staying up most of the night. I enjoy them that much!

[@TheRoyalInstitution]

We can't possibly condone you losing sleep but we are secretly very pleased.

[@qqb0t]

Thank you so much for uploading these Videos

[@billyaustin5317]

A great lecture - one of those where almost every word went over my head, yet I was still absolutely captivated. Bravo Mr Impey 👏

[@VincentLin-w2r]

There are *two* primary types of black holes, Schwartzchild Black Holes, and a Kerr Black Holes - One type of black hole is called a *Schwartzchild Black Hole* - - One that is stationary and spherical spahed. - Has only one event horizon. - Has a *point-like singularity* - Has no rotation/angular momentum. The second type of black hole is called a *Kerr Black Hole* - - One that is rotating, and elliptical shaped. - They are the most common type of black holes in the universe. - Has frame-dragging effects, where it drags spacetime along with its rotation. - Has a *ring-shaped singularity.* - Has *two event horizons,* the inner-event horizon, and an outer event horizon. - Has an ergosphere, a volume outside the outer-event horizon, where everything in the ergosphere's spacetime rotates along with the black hole. - Has an angular momentum.

[@StephensEFRC]

The best science talk I’ve seen in 50 years.

[@hobittthunderclapmclovin5408]

Stephen McCloud you should see more talks on the subject

[@lyness1217]

You mustn't spend much time online

[@davidkennerly]

This guy is great! I learned several new things about black holes and I've been reading about them for decades.

[@SlowToe]

Fantastic lecture. Thanks Ri

[@MrBitterman75]

What an amazing lecture! Many thanks for the upload.

[@anwarsansari]

THE SMOOTHEST EXPLANATION, HE MADE ME UNDERSTAND AS IF I WAS STUDYING NEWTONS FIRST LAW OF MOTION.. CHRIS IS REALLY GREAT. HATS OFF

[@carlz28]

anwar ansari you must have a weak brain.

[@sorcerykid]

Impressive lecture! I was just waiting for him to gloss over some key details, yet he literally covered every point from start to finish -- even touching upon nuances like the conservation of angular momentum while the star collapses and the dissipation of Hawking radiation for the black hole to evaporate and the paradox of information loss at the event horizon.

[@M1dniigh]

You had me at impressive

[@YodaWhat]

And yet, we still know _almost nothing._ Gives us something to do during those long, looooong ages until even the black holes die!

[@eyeheisenberg2278]

And yet it was still largely wrong. Nice video but a fail all the same.

[@janiselmeris5705]

In the beginning, he mentioned that black holes may be very small, theoretically, but didn't expand on that, addressing only black holes starting from several Sun masses.

[@AurelienCarnoy]

I just don't see how Hawkins radiation makes the black hole smaller as there is as much virtual particle falling in the black hole as there is falling out of the black hole. Maybe i am missing some information...

[@MarkLucasProductions]

That lecture was an exceedingly pleasant experience all round.

[@GotoHale13]

Yes very pleasant not to have to stick to actual facts and logic!

[@MarkLucasProductions]

@@GotoHale13 Just looking at it again to see what you mean. Could you tell me what facts were inaccurate or what was said that was not logical?

[@chrislittle4154]

Hahahaha

[@MarkLucasProductions]

@@chrislittle4154 ??!

[@chrislittle4154]

@@MarkLucasProductions thats me

[@TraneFrancks]

Fantastic presentation. One of the best I've ever seen.

[@carlz28]

Trane Francks you obviously don’t get out much.

[@klaasklapsigaar1081]

Now I know why time passes so slowly when sitting next to my mother-in-law.

[@avichalpandey254]

Relativity ..........hehehe!

[@serpent12]

I need to stop watching these before bed

[@jrrm_]

serpent12 that's how I fall asleep everynight

[@carlz28]

serpent12 just stay off of KZbin. You’ll do us all a favor.

[@SeanTimberlake]

@@jrrm_wow. i fall asleep to it every night too. Its so soothing. Space, physics, quantum mechanics

[@Biskawow]

@@jrrm_ lol me too... Headphones are annoying tho

[@danielsima7015]

2.32 am buddy

[@1612ydraw]

Wonderful lecture. One of the best yet.

[@MoriKitsune]

<a href="#" class="seekto" data-time="1680">28:00</a> gave me goosebumps. Absolutely beautiful and humbling

[@ArielScync]

I never though about how Edinburgh sounds like "Edinbruh". Amazing lecture, too.

[@theradgegadgie6352]

@M. de k. More like Gren-itch.

[@theradgegadgie6352]

You think those are bizarre, how do you think you should pronounce "Loughbrough"? One clue, it isn't Lewga-bar-oo-gah, as one American I know suggested.

[@theradgegadgie6352]

@M. de k. Definitely not the "bro" bit, as that is distinctly American. We never say bro to rhyme with hoe in a place name. You didn't do badly with the first syllable though, as that combination of letters has about four different possible pronunciations in British English. For example: Plough: A tool for farming. Plow. (Which is exactly how Americans spell it, of course.) Thorough: To do something very carefully and/or in great detail. Thuh-rugh. Chough: A bird. Chuff. Through: To pass through something. Threw. Thought: A person's inner musings. Thawt. Loughborough is pronounced luff-bruh.

[@Brian.001]

@M. de k. Weird pronunciations for their own cities? LOL. You were expecting Ed'nburrow, weren't you. :-D

[@Shahpo]

@@theradgegadgie6352 Someone watches too much James Acaster :P

[@coniccinoc]

Lovely! Thank you for providing this video.

[@buffectomorph9657]

10^100 years. We had a good run.

[@TheConqueror009]

Dont worry your muscles could stop the black holes. Not.

[@TheSpartan3669]

@@TheConqueror009 lol. Insecure much?

[@Biskawow]

Christians be like: not long enough!

[@TheConqueror009]

No not really. Nice try though pal you get 1 kudos. But not good enough for 2 kudos.

[@beastmaster415]

@@TheConqueror009 I literally was gonna say the same thing before I saw you're comment..🤣😂🤣 like dude you could flex and rip space-time ..I got what I meant

[@lastadolkgGM]

What an amazing lecture! Thanks for sharing this video, giving me the opportunity to learn a bit more about black holes and it's mysterious properties with a great talk by Chris Impey.

[@arekkrolak6320]

amazing lecture, such natural flow, such deep understanding and passion - bring more of those!

[@rogerwelsh2335]

This is a wonderful video. Someone would be hard pressed to describe and explain this subject matter any better.

[@brucehayman4206]

great lecture! I have been following Chris for years. He is a pleasure to listen to

[@davidcolombier5673]

I really enjoyed this lecture. Thank you Chris Impey!

[@Erik-rp1hi]

Good clear explanation. I can see he writes books.

[@Erik-rp1hi]

@@StonedDragons You know all this info he talks about is in equations. Do you also have equations for your explanation?

[@atmclick]

@@StonedDragons Wow. Aren't you a smarty pants. Maybe you should take over as the deputy head of astronomy at the University of Arizona

[@xebek]

@@StonedDragons He clearly mentioned that the largest black holes will be the last ones to evaporate (smallest surface area to volume ratio). Also, you haven't provided a shred of independently verified, falsifiable, nor peer-reviewed data demonstrating your claims as valid and sound. Why is that? It's easy to make bald assertions. Not claiming you are necessarily wrong, just that you've fractally failed to meet your burden of proof. Odd. Lastly, this lecture was designed FOR LAY PEOPLE, intentionally, so your criticisms about "dumbing down" are ludicrous and fallacious. C'mon now. Begin to care whether or not your beliefs comport with reality.

[@aniketsinghas]

Great Explanation 👍

[@migfed]

It's just my impression or his English is just exquisite

[@stephanieparker1250]

I’m in shock over it, seriously. I have friends from the UK who lived here in the US for 30 years and still sound like 18th century chimney sweeps Lol

[@TheMadScientistOfLuton]

I remember attending a RI Christmas science lecture as a kid and seeing myself in the audience on TV, back in the day when TV had 5 channels and being on TV was a big deal lol

[@hubertg7100]

Easily understood , great lecture.

[@gc9470]

Space, time and gravity are one… The singularity is raw consciousness… I put it to you that Space+time+gravity= consciousness! Consciousness creates matter.

[@normanstewart7130]

Thanks Chris, great talk. Haven't seen you since Edinburgh, about 1979!

[@tantiwahopak101]

Who are you?

[@illidore]

Tantiwa Hopak I am Norman Stewart, your classmate

[@athishprajwalgr2703]

It was a remarkable speech by chris. And we request please still make like this more speeches about these things

[@Asdayasman]

Excellent, a good lecture, rather than a bunch of big words and advertising.

[@urinater]

YouTubalcaine no wonder I want to buy a black hole

[@sketcharmslong6289]

Asdayasman hahaha

[@MrKangdon]

"I took a relativity course and it wasn't much fun"?! GR the single most elegant and beautiful theory in all of science.

[@JC_923]

I think he meant the maths. Mathematicians, theoretical physicists and cosmologists might not find GR maths challenging but I bet many physicists do.

[@antonystringfellow5152]

"GR the single most elegant and beautiful theory in all of science." But not as elegant and beautiful as the theory that will eventually replace it. The thing is, GR doesn't explain the universe in which we live... it only goes so far. As did the Newtonian physics that came before it. A better theory will be routed in the quantum world. After all, that's what the universe is made of. That's what we are made of (quantum stuff).

[@kengallagher9047]

Fantastic lecture. remarkable!

[@fanzhang3291]

Amazing talk, I really enjoyed it!

[@Slimm2240]

He's good at explaining things simply

[@mrloop1530]

So are you

[@biffedya]

he said if you watched your friend fall into a black hole you would never see him go inside the black hole because of time running infinitely slow ...does that mean you can come back 10 years later and still see your friend not go past the event horizon.

[@itsdrizzling2493]

hi! that's one way of interpretting it! what he says is true as veryvery near the event horizon the speed of the photons coming towards us is practically just a bit faster than the escape velocity hence the "image" we see is a person in the moment when they appraoch the event horizon. however it isnt the same for that epersonn in their time frame they just continue to fall in. as to your question, you might be able to see them however the thing is the image of your friend falling in fades as it lowslowly gets red shifter. hence eventually it will be so dim that you just can't make it out

[@biffedya]

@@itsdrizzling2493 thanks for the reply....I will take the trip back to the black hole ten years from now off my schedule and remember poor Steve just the way he was...the unlucky one who called heads for our black hole experiment

[@Tossphate]

Well done RI, this one was absolutely fantastic.

[@klong4128]

When i first saw the Blackhole picture , it was just a donut ring! .After your elaboration based on Hawkin Radiation simple mathematical formula , it revealed Astrophysicist painstaking hardwork and knowledge sharing . Very good job done !

[@jeanbigboute]

<a href="#" class="seekto" data-time="1020">17:00</a>m The Oppenheimer/Snyder paper on black holes was published the day WW2 started for Europe (9/1/39). It was well before the US entry into the war and the Manhattan Project.

[@meh583]

100% correct, I cringed a bit when I heard that, I don't think Meitner and Frisch had even proposed fission at that point. Oppenheimer was mostly just an administrator for Manhattan Project, Szilárd and Fermi are most responsible for the core idea. Fermi also proposed fusion to Teller if I recall.

[@jeanbigboute]

​@@meh583I remember that Szilard had done calculations on self-sustaining nuclear reactions in the early 1930s and was present when Fermi's group got it to work in 1942. I can recommend the Web of Stories channel which has lengthy interviews with Bethe, Teller, and Dyson from ~1997. Fascinating stuff including but not limited to their weapons work.

[@dream19992000]

I am not a students of Astronomy but I have finished the lecture with pin drop silence and great interest... Thanks a lot for expressing the critical objects in Simple words...Hope Mankind will survive to 10^100 years :) ***Hail Human***

[@AllCarsUnited]

Yup another day another black hole video. Who else wishes they could just take off on a space ship and explore the universe?

[@observerjoe4292]

Injury

[@observerjoe4292]

HubbyanddadHubbybhHubbyh56yHubbyisdoinggreatHubbybuuandhyh6yHubbyĥĥbuhhủyhibytugHubbyuubHubbyhuhuuuuHubbyhuh😅7ťÿ3yt4ťgg5ty3gyygy5g5tgy3ttyyyg

[@observerjoe4292]

4tht

[@observerjoe4292]

Try3tþ5ttryrffryerrtrgetyytfgtftytyfftrrfGTG3EggerttyrVTtytgtVTtygf3teffectstygeRty5fftRty5feetcfrrrGTGgyftrftfygTtttycygfþeggedfCTfcryyverytgeffttygf3rft2Rty5trþrergetterþrftretryrgettyftþttrugyfdGTG4thYtgyyTttgrugtreyþTttfrþt2Tttte4thft4thetRty5Tryftř4ťyþgetty3tTtt4thYt

[@qunningStunts]

I'm only halfway through and had to start up my pc to write this. He seems to have perfected the intellect of a brit with the subtle bluntness of an american scientist living in the south. What a great listen this is

[@kaollahina5479]

That visual of 20B solar masses made me feel like I got hit by one punchman

[@carlz28]

Kaolla Hina that was probably the drugs.

[@fashionforward4748]

Feels like a gut punch

[@breakthecycle5238]

he's a hero for fun

[@teejay818]

Man, that animation of the stars boomeranging around the center of the Milky Way was special, thanks.

[@wiseguy8828]

It comes from a Ted Talk of one of the scientists that spent a decade tracking the stars and producing the visualization including the music. But agreed it’s wonderful.

[@Nx2.1]

Truly stunning.

[@Djzaamir]

That was a very interesting presentation, quite a subtle ride

[@slamrn9689]

I agree, one of the best ones from the Royal Institution that I've seen.

[@metafuel]

Fascinating. Thank you.

[@H4rd5tyl3]

This man makes listening easy! Great stuff. Thank you.

[@MeissnerEffect]

Brilliant. Thank you!

[@MiriamOhara]

Fantastic information and splendid professor!

[@juzoli]

I have an idea about how black holes work, which seems to be a straightforward consequence of all the relevant theories in physics, but I’ve never saw it being explained in a such way, so I might be wrong. Did I miss something? Here is the idea: Matter falling into the black hole NEVER reaches its center, it doesn’t accumulate in a single point, but it is frozen i to the surface. To explain it, let’s review how matter falls into the black hole from 2 different point of view: POV of an outside observer: An object falls towards the event horizont. But since the object’s clock slows down in the presence of strong gravitational field, we see this falling object slowing down as it is getting close, and effectively freezing on the event horizont (which we don’t literally see, because light doesn’t escape there). POV of the falling object: Our internal clock has constant speed, so we don’t experience any slowdown, so we keep falling through the event horizont towards the center. Or do we? Our time slows down from outer perspective, so the outside world’s time speeds up from our perspective. The entire life of the universe is happening in fast forward, before we are even getting fully throuh the event horizont. In infinite time, we would reach the center eventually, but black holes doesn’t live forever. It evaprates through Hawking radiation, so basically just as we reach the event horizont, we evaporate back to space skipping zillions of years, while the universe is dying around us. So basically we are frozen into the surface of the black hole throughout the entire life of the black hole, until it is evaporated. However since we add mass to the black hole, it also gots a bit bigger by our mass, and the event horizont moves out. And that’s how information is encoded into the black hole. Every particle, which has ever fallen into it, just adds a new layer to it, and the particle is encoded into that layer, until that layer evaporates. Does that sound right?

[@qingyangzhang887]

I think he hints towards you theory at 26:10

[@juzoli]

Q&science Yes, but the conclusion is missing, which is my point. We don’t fall “into” the black hole. We are frozen on the surface, thus information is not lost. And then it spits us back into space through Hawking radiation.

[@JDLuke]

@@juzoli That is indeed one slice at resolving the apparent paradox, and I'm partial to it myself.

[@otis2337]

@@juzoli you do fall into it though...it is only relative to a bystander that you are frozen in place. The point is that the person falling is in fact consumed by the black hole, it's just because of relativity and the time difference that it appears to us that they never actually disappear. If an outsider was to watch for an infinite amount of time, the person would eventually disappear. When speaking about "encoding," one is implying that, yes, the object has been consumed by the black hole, but perhaps the object's information- not the object itself- is stored at the event horizon.

[@juzoli]

Otis Simmons But that fall takes infinite time, while the black hole evaporates in FINITE amount of time. So the black hole’s life ends before the fall could happen.

[@MartinPurvis]

Really interesting talk!

[@DiscoGreen]

25.56 implies the information is lost to the external viewer in relation to viewing from the outside of the horizon. But the information is not lost to the observer relative to the information. Relativity doesn't disappear at the horizon. Just because an observer would be spagettified doesn't break the rules.. the observer would be frozen in time to outside observers but would see the information .. the socks falling across the horizon with his self... In his timeframe.... No paradox.. just not easy to visualize.

[@schmetterling4477]

The information isn't lost until the black hole evaporates. The paradox doesn't appear until we make the assumption that Hawking radiation is purely thermal in nature. In the meantime they have proven that it is not and can not be. Most of the "information" simply comes out as highly correlated radiation late in the evaporation process under proper quantum mechanical analysis.

[@shibainuherald8363]

I must get that scifi book of this gentleman. The ending of this lecture is so deep and hopeful.

[@ferkinskin]

excellent. thank you

[@cosmicthespacecat]

What an amazing lecture, now I am truly free to be able to understand the cosmos without even requiring all the Calculus and Advanced Math for it.

[@froop2393]

<a href="#" class="seekto" data-time="1480">24:40</a> i thought that all the socks lost in our washing machines are contributing to the dark matter 😎

[@you2tooyou2too]

not yet.

[@MJ-zx7hn]

Is this a thing? Do people really lose socks inside washers?

[@TheDisabledGamersChannel]

Amazing lecture as always.

[@Boulos-cb2un]

My brain hurts but that was awesome 👏👏👏

[@cyclingnerddelux698]

The Phoenix Cluster graphic was mind-blowing. Wow.

[@personalpc7439]

Fascinating lecture...

[@Tortellia]

I honestly like to secretly think that universes are created inside black holes, including our own. It makes me happy

[@TheStell231]

There's a scientific theory that our universe is inside a black hole

[@ovdtogt1]

<a href="#" class="seekto" data-time="575">9:35</a> Would an observer in an expanding building experience the same red-shift and sense of acceleration similar to gravity?

[@DrakeLarson-js9px]

Outstanding video until minute48! The Singularity quandary mentioned in minute 18 has still another layer of intrigue - that being inversion buoyancy; and Mary Fowler’s geophysics insight about possible dark energy evidence. This makes minutes <a href="#" class="seekto" data-time="1410">23:30</a> and beyond, much more speculative - minute48and beyond is entertaining Hocus-pocus. And the best part, when it comes to math has a ‘take our word for it tone.

[@gaspersrsen5011]

I have a coupe of questions: If gravity spreads outward at the speed of light, can gravity have an effect on a gravitational wave? Graviational lensing couses the light from galaxies behind them to get stronger, could that be the case also with gravity (reffering to the first question that the gravity would have been bent)? And if that is the case would it be possible due to the superpostions of gravitational waves to create a "gravity tsunami"?

[@drbonesshow1]

As a physics professor, I learned years ago, that Einstein derived the Sphincter Equation to describe the ring of a Black Hole. This while he was sitting on a toilet at the Institute for Advanced Study at Princeton. Then along came Hawking and his glow...

[@bartbarry2662]

What would be a better lecture would be discussion of all the failures in the math and physics when it comes to black holes

[@gammaraygem]

not to mention the invention of dark matter and dark energy ,making up 96% of the universe after the theory did not fit the facts. Science has gone astray very badly. Ligo, CMB and Higgs Nobel prizes were not even peer reviewed . these headless chickens do not even control their primary instrument: Thought, mind, and they havent got a clue what Consciousness is. Try stop your thoughtflow for 5 minutes and it is obvious that these "scientists" are anything but methodical. And then there is the awkward problem of GR not being compatible with QM. "we need a new einstein" said Michiu Kaku. Nope, we need honest scientists that stick to the rulebook, of being methodical and observation based.

[@tims.2832]

If time is standing still at the event horizon, a black hole could be a violent explosion, going off right now. From outside, it must appear as an almost eternal thing. Why do we imagine black holes as something, that are "doing" anything at all? If time is slowed down to zero, there is no cause and no effect anymore.

[@schmetterling4477]

Time isn't standing still at the event horizon. The classical analysis breaks down.

[@tims.2832]

@@schmetterling4477 On earth, we can measure the influence of earth´s gravitational effect on time. Our clocks are good enough today, to measure a time difference between objects, that are 1 meter higher than a reference object. I would assume, that the gravitational effect is basically maximal at an event horizon. Shouldn´t the effect on time then be correlating?

[@climbeverest]

A Brit with an American accent, nice!

[@mwindasaboi6039]

Amazing presentation! Even exceptional scientist and presenter! Reality of everything in existence, in a nutshell. Wow!

[@thechrisgrice]

@<a href="#" class="seekto" data-time="2154">35:54</a> XKCD! Actually... almost all the videos in this presentation are from various free internet sources, including youtube.

[@thomas.moerman]

What a terrific teacher.

[@FighterFred]

Exactly these concepts that produced my PhD in astrophysics a long time ago. And you don't have to wait for the end to use BH as energy sources. Close to the horizon they act like one-way time machines, sitting there for a while will propel you into the far future after the cultural marxists are long gone.

[@rexremedy1733]

Fredrik Wallinder haha, so there is an escape? Would love to hear what you think about my suggestion... :-)

[@kasperadamson4654]

What a fantastic lecture and lecturer. 👨‍🏫

[@jmctigret]

Just finished watching this, going outside to make mud pies.

[@audiodiwhy2195]

Excellent presentation--clear and interesting for a non-physicist

[@MrBendybruce]

Imagine a day when you walk into wallmart, and right next to the Toaster and Microwave ovens; is a small Black Hole Generator, which has a small red warning label on it saying, not suitable for children or people who want to cause the world to end.

[@surfingbilly9654]

The only thing that can stop a bad guy with a Black Hole Generator is a good guy with a Black Hole Generator.

[@kevinshort3943]

Some theorise that a washing machine is a Black hole generator. Where do you think all your odd socks go?

[@millantronni3242]

Thanks, I needed this, my brain was numb after a video that continuously claimed "dogs always produce dogs"

[@kevinshort3943]

Dogs do always produce dogs, no one thinks otherwise. If a dog produced a non dog, we would have to seriously rethink Evolution.

[@millantronni3242]

@@kevinshort3943 " Dogs do always produce dogs, no one thinks otherwise." ohhh, go and look into the swamp of YEC's. A YEC's brain function as follow Because dog always produce dog no speciation occur and therefore evolution is a lie but the next second same brain thinks the following have actually happen After the flood 6000 types of unidentified kinds, over some 2-3 generations, produced 6.5M+ species

[@kevinshort3943]

@@millantronni3242 "A YEC's brain function as follow" I have to take issue with that statement. YEC have no brains, and if they do they certainly don't function! YEC are told by the fraudsters perpetuating the religious scam on them, that "Evolutionists" believe that.

[@ameliuslantea1789]

What would be the implications if we'd absolutely fail to measure 1) Hawking-Radiation, only Unruh 2) Unruh-Radiation, only Hawking 3) Both instead of just one of the two? Not only by starting from the premise that we'd use today's top-notch knowledge, tech, materials etc. but also assuming that even if we got more advanced technology (some bordering on new physics/Science Fiction) which would enable us to directly observe a Black Hole like a space probe/spaceship equipped with a Fusion-Drive capable of reaching 0.5c or more (Time Dilation kicks in), Warp-Drive or even a Wormhole-Observatory (whatever you can imagine) we'd fail to observe 1, 2 or 3? ps: the methods mentioned above just serve as plot-devices no matter if possible or not, it's about the implications of my question and a "What If?" Scenario

[@thechrisgrice]

In the case of 1) It would mean that black holes are eternal, and this would actually fundamentally rip up a lot of current physics, particularly the heisenberg uncertainty principle. This is unlikely to be the case though - the evidence for the latter is substantial.

[@333STONE]

@@thechrisgricewhat if the Black hole is the center of all things. Maybe ( fractalized) in us and called the heart of our matter. 7 layers of muscle 7 houses of the lord. Huh?

[@realitycheck3363]

@@333STONE Nothing is impossible. We exist as electrical impulses. By invocation, we believe. It can be difficult to know where to begin. Today, science tells us that the essence of nature is starfire. The goal of ultra-sentient particles is to plant the seeds of learning rather than ego. Purpose is the driver of sharing. Starfire is a constant. The planet is bursting with pulses. You and I are dreamweavers of the universe. Visitor, look within and awaken yourself. If you have never experienced this paradigm shift at the quantum level, it can be difficult to live. Have you found your journey? The biosphere is calling to you via atomic ionization. Can you hear it?It is time to take knowledge to the next level. Parvati will become our stepping-stone to unified aspiration. It is in blossoming that we are guided.

[@333STONE]

@@realitycheck3363 beautiful! Have you seen Phil Langdon on yt if not please do I'd love for you to hang in my reality for a spell. Lol seriously though you will fit in nicely . Thank you btw

[@Iamsahid25]

Mind-blowing lecture ❤

[@enlongchiou]

Einstein's ER=EPR limit worm hole at Planck's scale l=gm/c^2 by entanglement.

[@moneymp3]

Incredible lecture. 10/10

[@redandblue323]

Who thought the music during the visual aids was a good idea?

[@curbappeal3397]

redandblue323 I did

[@aidanlevy2841]

This is the first time I really understood evaporation from a black hole. There has always been a voice in the back of my head that said that the number of escaping virtual particles should be 50/50 and I didn't understand the asymmetry. When he explicitly mentioned mass OR energy loss it clicked that an anti-particle that escapes from its pair could hit a real particle and some of the energy from that interaction could be radiated away.

[@Astares9]

i can kinda still hear the brit in his voice

[@carlz28]

Astares probably just the drugs in your system.

[@Astares9]

@@carlz28

[@YoungSaylor]

Cool, what I was looking for!!

[@cpt_nordbart]

We have only a googol. Hmm... Better make it count then.

[@333STONE]

Isnt it monopolized contrived mind molestation material

[@hygrobiology]

We are scientists and it is fantastically to receive your videos.... it is relaxing my brain again and again.... My boys Name is Albert and my Name is Nikolai..... if you understand reincarnation and time, then you understand why we love your communication