Black Holes Are Even Weirder Than You Thought!

[@angusfriesian8072]

In 1915, Schwarzschild's understanding of spacetime was already so great that he was able to reach into the future and pull back a book with old Einstein on the cover. Amazing!

[@seivaDsugnA]

Could be a camera trick, or some sort of slight-of-hand. Maybe psychosis, hypoxemia or urine overdose. Most likely a supernatural all-powerful conscious entity beyond space and time that created everything, though.

[@hazyhalfmoon]

😂

[@dreadlegend7365]

Lol good eye!

[@etsequentia6765]

Little known fact, and the cause of many misunderstandings: Einstein actually looked like that since he was five. Later they doctored some images to make it look like he looked different when he was young and conceal the strange truth.

[@ArvinAsh]

Yep, everybody knows he had mastered time travel! Don't you know?

[@alternative1999]

You are the only astrophysicist that I truly understand. I don't know how you explain complex areas of classical and queries of new concepts in this subject area. Be it extensive experience, a natural gift, or both, I am so grateful I fell into your orbit. As a fiction writer who needs a believable background behind a project I am starting, I am so grateful I can turn to you to contain and expand my plotting. Where were you when I was at school? We never even studied physics. I took it up as a hobby and had so many questions I knew it could only ever be a hobby. A lifetime seemed too short to answer even basic equations. You give me confidence to doubt, question, and then understand enough to move on. Physics has so many unanswered questions. I now feel reassured, from your lectures, that I know it is not ignorance, but curiosity that confounds me, and can comfortably work with what I've learned from you, knowing that I can tune back in when I get confused. I'm sure this is one of numerous similar posts!

[@ArvinAsh]

Thanks so much. I'm glad I can help satisfy some of your curiosity.

[@rycriswell2326]

Queries? C'mon man, that doesn't make you sound smarter..

[@educatedguest1510]

Just today Dr. Michio Kaku tried to save Big Bang by claiming that 3-days ago found 6 mature galaxies, one of which 14.5 billion years old and as massive as Milky Way, are not galaxies, but black holes. And last month Dr. Michio Kaku lobbied financing new accelarator to find out what happened in first second of the Big Bang. Definitely Dr. Michio Kaku has conflict of interests, so he proposes new 2-day old theory that one thing that never happened is happened due to other things that never happened. There were no Big Bang and there are no Black Holes (just images of non-ignited stars due to very slow time around them).

[@Spencie_C]

When it comes to explaining quantum and astrophysical concepts, you have found the "goldilocks zone". As a non-physicist, your channel does the best job of toeing that thin line between giving just enough detail (but more than a doc) to quench the curiosity, but not so much as to discourage the viewer. I really appreciate the time you put in, thank you!

[@magellantv]

This was incredible. Thank you for making such a complicated subject so easy to understand!

[@ArvinAsh]

Thank you for the compliment, and thank you for the sponsorship!

[@magellantv]

@@ArvinAsh It's our pleasure! We're so thrilled to be able to partner with such an incredible content creator!

[@CreepsCompilation]

As if this guy has any idea what he's talking about?

[@CreepsCompilation]

I have a theory that leprechauns caused the big bang and are pulling on the universe.. Dark matter fairy dust explains it all..

[@agenolmedina9159]

Arvin is the G.O.A.T. at explaining physics to common people like me :) I learned more physics during the pandemic thanks to Arvin than I did in college, thanks Arvin!!!

[@ArvinAsh]

Great to hear that you find my videos useful.

[@ccuny1]

What a fantastic video! Thank you so much for explaining some of a black hole's mysteries in a way that is accessible and enthralling.

[@jeancorriveau8686]

Two years ago, my ignorance of cosmology led me to believe black holes to be a rare occurrence, an exception to the rule of gravitation, so not worth studying. Now, I understand that it's the most important cosmic phenomenon. Arvin's passion keeps me captivated.

[@joosepjaagosild5888]

9:29 "whatever is inside, has not happened yet" (from outside view) i have never heard black holes being described this way, but it is such a perfectly clear way of thinking about it. ty! people usually say that time stops on the horizon. same thing, but seems so hard to grasp when stated like this.

[@oderalon]

I first learnt about Schwarzschild and the M-87 galaxy from reading German sci-fi. Years later I was immensely surprised when I found out they are real things.

[@Rationalific]

As usual, you give more information than almost any other science video creator on the internet while also making that information relatively (pun intended) easy to digest. For example, it was quite interesting to hear about how many planets could theoretically fit in the habitable zone of a star without interfering in each other's orbits, compared to a similar area around a black hole of a certain mass (even though most black holes are unlikely to have any planets at all, and there's no habitable zone at all around them). I always love these new tidbits of knowledge.

[@bobmango8472]

Best science channel on youtube. Arvin is the sweetest guy ever

[@artdonovandesign]

A fantastic episode explaining Black Holes!

[@Gielderst]

I love your explanation of things and your voice is phenomenal for the videos you create. Power to you always.

[@srb20012001]

One thing I really appreciate regarding Arvin's popularizing of Astronomy is his originality. He finds unique points or perspectives to cover not found in the glut of other YT astronomical presentations. This originality gives him the edge in content, imo.

[@augustuspatrone6790]

This guy explains things so well

[@christianmuller2863]

Danke!

[@ArvinAsh]

Danke mein Freund

[@johnstjohn4705]

You are very, very good, but you surpassed yourself this time. This is the best description of black holes I've seen.

[@ExtraterrestrialIntelligence]

Black Holes are time machines that collect the fuel for the big bang!

[@frankelkjr8041]

Nice!! I like that …. Your name makes me wonder how you thought of that 🤔

[@emmanuelweinman9673]

They do a lot more than just collect energy. The warp it, hold it, and release it as hawking radiation.

[@eternalsoul3439]

Too close to reality you stole my intelligence when I was dreaming. 😂🤣

[@emmanuelweinman9673]

@@eternalsoul3439 we share the same intelligence in different brains after all 😉

[@DarkMaidenFlan]

No, the matter the collect is converted into a energy that permeates the space-time of the other end of it. That energy causes space time to expand, likely at an increasing rate as its fed.

[@MegaRad666]

This one gave me chills. Something about Interstellar and other media about humans encountering the effects of relativity really gets me emotional. Thinking about how you can always revisit a place or person but never their time, always becoming more distant in our memory. Beautiful and bittersweet as sunset.

[@franks.6547]

If we conceive of ourselves as a worldline made out of 3D bodies that stretches throughout 4D spacetime - then this worldline stays in touch with everything/-one we ever encounter. I like to think of myself as a row of people "waiting" in line (in the time direction) - every instance of me is just thinking that they are in the "now" and they have memories of my younger versions - but they are there forever in spacetime (a.k.a. the block universe) Some alien that moves away (?) from us right now some billion light years away (from our perspective) will from their perspective figure that it's living at the same time with some precious moment in our past. We are an eternal engraving in 4D regardless what we might perceive at any specific event of our life.

[@CJ-M43]

"And that's coming up right now!" Gives me chills every time! Never change this intro!

[@kaxtorplose]

How come only artists get to see what's inside the event horizon?

[@ArvinAsh]

Artists' privilege...don't you know?

[@kaxtorplose]

@@ArvinAsh Nobody ever tells me about these things. Now I'm seriously doubting the value of my computer animation degree.

[@kaxtorplose]

@@ArvinAsh One more thing. I thought I was the only one who used the possessive apostrophe anymore. Now I at least know there's another out there, and I can finally bury this existential crisis in grammar for once and for all.

[@politelypolite4835]

Came back to this 3 days later to add that bit about the apostrophe? I'm doubting the value of your animation degree now, as well.

[@cesarb714]

You have one of the best channels on KZbin. Thank you!

[@ArvinAsh]

Much appreciated. Thank you.

[@catmate8358]

Nice! Black holes are such a fascinating subject. Regarding time, I think it's very interesting that photons do not experience time. From the perspective of a photon, everything happens at the same time. I don't know if you had already made a video on this subject or if you would consider making one...

[@misterlau5246]

More like they don't experience anything 😳👍🤓

[@alphagt62]

Perhaps that’s why their charge never fades? They don’t decay, because they are frozen in time?

[@misterlau5246]

@@alphagt62 they do decay. Don't think of them as something more than one of the most gravitational objects in the universe, at enough speed and distance, stuff orbits like anything else. But energy is something that in total is always the same amount. If x energy goes inside, if it gets out can't be more than x. And everytime any object interacts with others, if those objects are affected by the energy of the black hole, it has to give some of it to the objects. Just it has to pass like trillions of years but they will lose enough mass to explode and return the energy to the exterior. But there are the problem we live too little, we can't see a star birth, development and collapse...

[@Dan-mm1yl]

​@@misterlau5246 There is more than 1 star

[@misterlau5246]

@@Dan-mm1yl yes, why? 😅

[@believeinpeace]

I'm speechless with how intelligent you are with all the other astrophysicists. Thank you so much for making it somewhat understandable to people that don't get the math.

[@marcosgermano4737]

Funny coincidence: Schwarz = black / Schild = shield and this turns out to be the limit, the shell (shield) of the blackness (absence of light) of a black hole

[@GlynDaviesMyrddynMawr]

I think your final words are, in fact, the most accurate description of the fate of time and reality that I have ever heard uttered! Given the distinct possibility that each Black Hole gestates a parallel/notional universe with their own Black Holes - and that these remain within the boundaries of our own 'Mother' universe - there will never be a finality to space-time. A 'Continuum' indeed!

[@DrBrianKeating]

Another phenomenal breakdown of nature’s most mysterious objects! *If you knew you were guaranteed a return trip, would you take a trip to the Event Horizon?*

[@MrElvis1971]

No, I wouldn't. Too much stuff to do in one short life.

[@KatjaTgirl]

A trip to the event horizon would take longer than the age of the universe though....when you return Earth and everyone you knew would be gone... so no thanks...

[@smlanka4u]

Gravitons will return and accelerate Black Holes and other objects to the center of this part of the universe, causing them to convert from matter to energy-beams. Supernova explosions could happen only with the help of a lot of gravitons that comes out quickly. Neutrinos must be the gravitons.

[@DrDeuteron]

Looking up an watching the future pass me by would be too much to handle.

[@fundemort]

1 light year = 9 trillion km. so say a human's age is 100 years. a human can only travel 900 trillion km before he's dead.

[@e.mcguire1538]

Just wonderful, Arvin. You are a superb teacher with an extraordinary mastery of your subject.

[@LeopoldoGhielmetti]

Inside a black hole, all moves to the singularity and the more you try to escape, the faster you go to the singularity because each time you move inside a black hole, the faster you accelerate your time in the direction of the singularity (that is the thing that is in the future of all things in the black hole). The only way to fall into the singularity at the slowest pace, is to not move at all and just fall in. I can say that it's exactly what happen in the universe itself. We are going in the direction of the future (whatever it is), if we accelerate in some random direction, our time dilates and we go faster into the future. There is no way to escape, impossible to go back in time. The only way to go to the future at the slowest pace, is to not move at all.

[@ArvinAsh]

That's a good way to look at it!

[@arjavgarg5801]

Also the fact that time and space are said to switch around in the black hole

[@politelypolite4835]

Also there's a really good yogurt shop in there too.

[@jeanjimenez4633]

There is something always certain about your videos Arvin... I'm NEVER disappointed!!

[@flambambam]

I was thinking about how QM prevents electrons from "falling" into the nucleus, and was wondering if anyone has hypothesized an analogous process that creates a minimum energy orbit around a singularity. Not sure how it would work considering that gravitational potential energy would be near infinite for orbits approaching zero distance, but I figure that it would be worth a try.

[@timurgabdsattarov1613]

Well the smallest distance from the black hole where light can go around it is the Schwarzschild radius so…

[@RickClark58]

The Galactic Center Saga by Gregory Benford also has a civilization living around the black hole in the center of the galaxy. It is one of my favorite sci-fi series as it also explores the dangers of AI and where that could end up given enough time. The novel Dragon's Egg by Robert L. Forward is an exploration of a life-form that lives on the surface of a neutron star. Very interesting story.

[@emergentform1188]

Wow this video is amazing. I learned some things I hadn't known, and I love how simply it's explained and the graphics are top notch. Subscribed and looking forward to many more.

[@subhanusaxena7199]

Hi Arvin thank you for these amazing videos. You have a unique gift of bringing deep concepts in a simple way. Could you do a video in this series that then explains how, from Oppenheimer’s work, Roger Penrose won the Nobel prize for showing they are inevitable with the inexorable march to a singularity? I could never understand why there isn’t a similar exclusion limit at the quark or smaller level, that is just beyond when spactime is irreversibly curved to prevent light escape. Would that have solved the singularity problem? Could there be a “quark” star that exists at smaller scales within the event horizon? Would love to understand how Penrose and others proved this could not happen. Also, if an observer sees time stopping at the event horizon, does somebody at the event horizon see the whole future of the universe pass in front of them when they look out? So many question, thank you!

[@eddiebrown192]

Another great video Mr Ash . Coincidently the next video in my feed was Lee Smolin talking about his idea of blackholes being a new Big Bang . Fascinating idea .

[@enterprisesoftwarearchitect]

Great summary! Geodesic incompleteness and consequences would be a fun video.

[@kylelochlann5053]

It should be clear from the video's description of the singularity that Arvin doesn't know anything about geodesic incompleteness.

[@acemanNL]

Thanks for blowing (up) my mind! But you and your gargantuan good channel are still my best friends!!! Thanks Arvin! 👍💪⚫❤️

[@boahnation9932]

Man doesn't it almost just make you want to read all the physics books you can, really understand maths and actually be able to figure this stuff out too?

[@SoundzAlive1]

Arvin I have watched many black hole YT videos and was surprised that I saw many 'new to me' things in your presentation. Very well presented. Kudos to you. André in Sydney ⚫

[@ozzyg82]

I have always thought that inside a black hole is just a really dense, small star which shines brightly, but the light can’t escape it’s own massive pull on space time.

[@thedeemon]

Hawking and Penrose have shown that general relativity equations dictate all the mass under event horizon to collapse into singularity.

[@tjsogmc]

You might be right, who knows? We don't have any information from inside the event horizon, just guesswork. It could be marshmallows and unicorns. No way to know for sure because we can never test the hypothesis.

[@darkknight097]

I thought that too. I mean, the only difference between neutron stars and black holes is that the latter has a bit more mass. They both form in the exact same way (Or two neutron stars collide together) The implications of a singularity just doesn't make sense. Like i thought it was supposedly impossible for matter to occupy the same space. Being a singularity would mean that the atoms, protons, quarks (however the matter is broken down inside one) overlap eachother and occupy the same space at the same time. I don't get why blackholes aren't just considered a more massive/dense type of neutron star like a magnetar or pulsar

[@ozzyg82]

@@darkknight097 yes, well put. I’d be interested in hearing someone do a talk on those various points and perhaps why they are or aren’t possible.

[@swamiaman7708]

Wow...... Breathless..... And speech less.....

[@e0031-w5e]

Always wondered though: How do black holes give out Hawking radiation if nothing has (from our point of view) fallen into it yet?

[@32rq]

"slightly lower gravity on top of the mountain" @7:10 How can this be? Certainly if you were Everest's height above the surface, gravity would be less. But when there's a mountain beneath you, you can't just assume a sphere and measure the distance to the center, neglecting the mountain. As an extreme example to illustrate the point, if you went into a deep valley, you are closer to the center of earth, but part of the earth is now pulling *up* on you. In fact you can neglect the shells of matter above you (they exactly cancel if you run out the math), and it's as if you're standing on the surface of a smaller planet. Take this to the extreme with a valley of Earth's radius, and you'd be in zero g. Assuming the mountain is wide (like Everest is in the Himalayas) I'd expect it to add more gravity than the altitude takes away. Someone please explain this, am I wrong or is Arvin, and why?

[@bluehope42]

The mass of the earth is what causes gravity and compared to that the mass of the mountain is negligible. Moreover, gravity reduces by the square of the distance, so the height of the mountain matters a lot. That's my understanding, someone correct if wrong.

[@ShlokParab]

9:20 I think that nothing *needs* to be happening at singularity as it is an _instance_ in time, like a photograph but of the universe /when the singularity was formed/. It is static in time, like derivative of time, of but of _zero_ width, which is not enough for anything to happen.

[@Faisal710]

What if we put one of the particle of entangled particles into the event horizon than we can know what happened to that particle we put in by observing the particle we have out of the event horizon

[@sagarshrestha5800]

Nice

[@AndrewBrownK]

No

[@bismarcknorthdakota7183]

I wan kno that too!

[@jamesraymond1158]

What fascinates me is the swallowing of space time that is shown at 13:03. I would love to see a whole video about this. Is space really being consumed here, while it is expanding everywhere else? If space-time is being swallowed near a black hole, does that mean it is also being swallowed around other masses like the earth, but just at a slower speed? Might that even explain why things fall?

[@shadowoffire4307]

If you find science very very exciting then you are learning it from right teacher like Arvin. -richard Feynman.

[@davidclark682]

“If you think you know QM then you don’t understand QM” R. Feynman

[@PMA65537]

@@davidclark682 If you think I'm dead you underestimate how much fun I have posting on the Internet better stuff than Gell Mann. -- R. Feynman

[@jakexou812]

glad the lieutenant didn't put in as much effort into his job, he may have figured out how to win the war.

[@suyapajimenez516]

Hi Arvin , thank you making physics understandable for the commons 😊. I’d like if it’s possible to explain Einstein equation . Don’t laugh I’m curious health worker.

[@ArvinAsh]

Thanks. I did that a bit in this video: kzbin.info/www/bejne/hKS4nmyjg72ljpY

[@anntakamaki1960]

I totally forgot about this channel, glad I found it again.

[@CaptainPeterRMiller]

A great advance in broadcasting scientific information.

[@dubsar]

13:20 What is the habitable zone around a black hole like?

[@mnpd3]

Einstein was certainly no math-novice, but his greatest asset was his imagination which combined with science produced advances we still marvel at. Schwarzschild was a pure mathematical genius. That he died so young was a loss to the world. His day job as an artillery officer was to work out the math for the gun trajectories which must have been mere child's play for him.

[@kristjanveski]

I'm so glad you explain this while acknowledging our limitations rather than simply spouting theoretical information as if it was fact.

[@gabicancho7287]

Love your videos!! I would really love to see one about identical particles and how symmetrization Postulate makes phenomena as Pauli's Exclusion Principle arise.

[@Aviator27J]

Peter Cawdron's books are great! And there was good scientific paper I read about the possibility of habitable planets orbiting a black hole and it was compared and contrasted to Interstellar. I don't remember who published it but it was an interesting read!

[@gusnemides458]

Since time stops at the event horizon, nothing can passes through it. Therefore, nothing falls inside a black hole, according to us.

[@Adamzki55555]

What if the big bang was a black hole devouring a star in another universe which would explain why everything was so hot then. Wouldnt that also explain why the maximum volume of space can be described by its surface area and not volume, because information that has fallen in into a black hole can be stored on its event horizon. Maybe also time could have started at the big bang then because of that we race towards the singularity as described in the video.

[@99dudette]

Arvin what do you think about the wormhole sycamore identified? They think they have a theory of quantum gravity, I would love to see a video from you on the subject!

[@ArvinAsh]

That's my next video, in fact! Coming in early January. Stay tuned.

[@amukh1_dev274]

> "It could lead toa Quantum understanding of gravity," I thought thats what string theory was for? 9:35

[@ArvinAsh]

Well, string theory makes predictions which so far have proven to be incorrect, so it may or may not be a viable theory.

[@amukh1_dev274]

@@ArvinAsh Ah, thank you for telling me.

[@Syncoda]

I think you’re my favorite youtuber. Your videoes are teaching me and everyone else so much! Thanks for doing this ❤️🙏🇩🇰

[@neilgreening9609]

Wow - that is a truly great episode ❤

[@puneetshakya3001]

I love your videos sir ❤️. Your explanation is the simplest. Love from India 🇮🇳.

[@prashantkumbhat]

Love it! Complex ideas explained so easily! Thanks @ArvinAsh! #Inspired

[@petergreen5337]

Thank you very much publisher.

[@rajachan8588]

Fabulous, fascinating and very informative. Thank you

[@Gamer-xb1eo]

You are one of the best content creator on youtube. Love from India.

[@sundeutsch]

That's coming up, right now! I find this style more fascinating than anythig else.

[@spookyaction]

4:52 this is the polite way of saying we are wrong. But I agree with you. But to make an improvement, we must accept that we are wrong and we dont know so dont be afraid saying we are whong or we dont know...

[@rezNezami]

great great video Arvin. thank you

[@HunzolEv]

Amazing Ash! I have a feeling you've been on a quest for the Grand unified theory :D

[@TheLingWhisperer]

Videos like this always forget to mention - if you were the astronaut falling into the black hole, your perception of time would remain normal within your reference frame, but you would gradually see the rest of the universe speed up as you approached the event horizon. In such a way, you could consider occupying the edge of an event horizon as a form of forward-moving time travel, as the rest of the universe ages faster and faster the closer you get to the object. I wish I knew enough about physics to visualize how extreme this effect could be - would you be able to witness the heat death of the universe before dropping off into the edge of eternity?

[@shayanandibra2840]

I like the way he talks

[@jollyfishman4451]

In the prior video Arvin said that neutrons in a neutron star could not be compressed further because of the Pauli exclusion principle. Is there any idea what kind of quantum object could be compressed more than the neutrons in a neutron star? Is there any theory about what happens to the neutrons that allows them to be compressed further? Do they become some new quantum particle? Is the Pauli exclusion principle violated?

[@FinnishArmy]

Every video on black holes ever: "not even light can escape"

[@Anna-ss4sf]

“Black holes are the future of our universe”… now I’m depressed.

[@NeonVisual]

The universe is the inside of a black hole. Instead of everything being crushed down to a singularity of infinite density where time comes to a complete stop, everything in the universe expanded out of a singularity of infinite density and time began. The internal event horizon of the universe is the cosmic horizon in which nothing, not even light can ever reach, and so could never escape the universe.

[@damonlewis5967]

Or do we limit our understanding of what time is. Has everything been collapsing and exploding constantly churning everything in perpetuity ?

[@stephenbrickwood1602]

Imagine a force that pushes everything apart and a force that pulls everything together and then a force that stops everything coming together and then more forces with more special rules that are discovered after the first forces, and every force has a name that sounds like it's properties. Just being silly, I actually do like your work.

[@ronaldkemp3952]

You just described gravity, dark matter, dark energy and a white hole connecting to a black hole through a wormhole on the other side of the universe.

[@shashidharshettar3846]

Thank you for your simplicity

[@dziban303]

Thanks Marvin

[@imdeexpert5828]

I think these information videos need to start encouraging and inviting people into this field of science, instead of just being mere theories good to know. Who knows, someone who watches your video might be inspired enough to join to this field and become the next Einstein or greater. Giving us an equation that will further liberate mankind's understanding and subsequently manipulation of the universe

[@civotamuaz5781]

I've heard that 0 element on periodic system was ether put there by Mendelyev but was later scrapped, Nikola Tesla also talked about ether in his works. What if they were observing properties of the matter on quantum level? It's an ever stretching field of potential energy that can be harnessed or something but it's not enervated emptiness that permiates space.

[@politelypolite4835]

0 element would have zero atomic mass meaning it's not an element.

[@dotbaban99]

This is awesome.

[@127-u4l]

love your Channel

[@rycriswell2326]

Very nice relaxing video

[@paulroberts7429]

Some phyisics believe we live in a Blackhole, blackholes remind me of pc storage in delete mode magnetically wiped, fresh new space.

[@alexobed4252]

People talk about the universe going dark one day. But wouldn’t it be true that new stars are constantly forming? You have supernovas that are constantly spewing new materials into the Universe-it all would seem like every destruction leads to a new creation, no?

[@ArvinAsh]

There will come a time when no more new stars will form, and the last stars will burn out. But this won't happen for a long time.

[@jiveturkey26m]

Is it possible that all matter gets thrown out of a black hole? And that black holes only grow due to black hole mergers?

[@jiveturkey26m]

Like trying to mix oil and water. Likes only dissolve other likes.

[@jiveturkey26m]

Matter needs time to exist, so no time, no mixing.

[@ArvinAsh]

Matter in the accretion disk could get thrown out, but not from inside the black hole.

[@BoycottChinaa]

8:25 thanks, I was super confused until I saw the graphics message

[@Adept0eX]

Between the relativistic dilation of time around a black hole along with their massive life expectancy, I can't imagine how would be the perceived flow of time for the life it could be formed around a black hole

[@ArvinAsh]

Flow of time would not change from the perspective of anyone within the high gravity environment.

[@oldrusty6527]

Incredible content

[@sergiolucas38]

Great video :)

[@KrisAmos]

Where did the black holes in the center of galaxies come from? Were stars in the early universe a lot bigger than we realize? Or were there a lot more black holes that were able to combine?

[@joem1152]

Could someone please explain how “time and space switch around” in a black hole?? I need to try to understand this..

[@digiswitch]

me too... he only spent a few seconds on this in the video - and it was the most interesting thing he said - in the entire video!

[@sjaakderksen531]

I'm curious. Material ejected at the pole by means of a quasar: is that coming out of the accretion disc? Or from inside the black hole. And if the latter, is that material coming from the future?

[@ArvinAsh]

Nothing comes from inside the black hole. The jets are from the accretion disc.

[@dubsar]

6:16 If nothing inside a black hole can communicate with what is on our side of the event horizon, how can we know the mass of the black hole? There is something that escapes the black hole and causes effects on our side.

[@thedeemon]

We know it by observing how it attracts other objects (stars usually) around. This attraction, according to general relativity, is "felt" by outer objects via spacetime curvature around the black hole. Nothing needs to leave the BH, all the information is already contained in geometry/curvature of spacetime around it.

[@jondominic]

Hi Arvin Ash, your content is great. I was wondering what if a most powerful Anti gravity machine be created so that it can go inside a black hole and look around and then come out to tell us about the trip.

[@ArvinAsh]

No. Spacetime changes inside. Once you are inside, you can never get out, because time itself goes toward the singularity. Traveling in any direction with only take you to the singularity.

[@jondominic]

@@ArvinAsh thanks so much. I really appreciate

[@stephmaccormick3195]

Thank you for pronouncing Schwarzschild correctly. No childeren were harmed during this video.

[@ArvinAsh]

Thanks. It's sounds cringy to me too when people say Swarz-CHILD

[@RLomoterenge]

Ever since I’ve heard about black holes when I was a kid in the 90’s I felt like a black hole sounded like a reverse big bang. I just thought that nobody talked about this because I was wrong since it seemed so intuitive to me and these things tend to be unintuitive.

[@jorgearango6108]

Excellent! Thank you