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Physics videos trying not to give people existential crisises challenge (impossible)
"Impossible tasks make for the best challenges - even for physics videos." 🤔
stupid people cannot understand you.
what I learned from 1 hour of this is that black holes are effectively a giant battery that are also incredibly dangerous to tap into.
@Will Baskin People then never accept such truth. We know nothing, when considering the Universe.
@JenkemSuperfan but it’s fair to say we don’t know what we don’t know
@Xogroroth666 if you read his whole comment he agreed with you but expanded on your answer
Nice observation! While it's true that a lot of mass and energy can escape a black hole, it's not something we'd recommend trying. 😉
You and Isaac Arthur are the only two YouTube creators that have me gleefully watching hours and hours of content while everybody else is worried that their 3-minute video might start to bore people lol. Well done! Thank you for trusting your audience to have the attention span to match your amazing videos!
SEA is also fantastic, probably the best, he talks a little faster and covers much more in the same amount of time.
@Scrub Chan The IPCC has to say that to get anything reported, do look up how politicized getting a statement from the IPCC is, then listen to what the actual scientists are telling them . Its way worse than the IPCC reports . Also look at all the backtracking the IPCC has to do as each `forcast ` hits worse case and worse case keeps getting worse consistently . Also look up all the things the IPCC wanted to include but was unable to reach `political consensus` then tell me i am incorrect .
You should get out more
@peter lewis the last statement is incorrect. The IPCC published a report that proved it's well in humanities capacity to reverse the damage, the only thing lacking is societal willpower and/or ignorance of scientific research
you might wanna check out anton petrov. his stuff is way less polished and documentarian, but his turnaround is so short he can put out space/science content that's super current. it's less about explaining the big concepts in depth and more about stuff that's actually happening right now, so you get to hear about all the stuff that might usually falls through the cracks in favor of the usual suspects. it's great especially if you love the minutae of discovery, theory, and experimentation. and he's got a cute accent and a soft voice that's great to fall asleep to lol
I want to congratulate you. Yours is one of the few cosmology channels on YouTube worth anyone’s time. I like how you respect both the viewers’ intelligence and the subject matter. No bombastic background music, no movie-trailer style voice over. Just the science, the mystery and the awe of it all. Please, keep on the great work you’re doing!
Agree 100%. I recently found astrum and I feel like I fell off the cliff of knowledge with no one around to pull me out. So much wonderfully created content on this channel to grow someone's understand of this universe.. it's simply astonishing.
Thank you for this informative video!
Thanks for the appreciation! 🤗 We still have a long way to go before we explore this strange phenomenon fully. 🧐
I am so attracted to space stuff but have to admit it’s always pretty complicated to get a realistic grasp on the information however it’s still interesting even though I don’t really understand it. I have seen countless videos on black holes and in your first 5 minutes you were able to present the information in such a way that I feel I finally have a good understanding of the basic situation now! Thank you so much you definitely have my like, follow, and share! Can’t wait to see the rest of the video
Nicely done! 🤓 I'm glad you finally got the hang of it.
No such thing as black holes: don't be gullible
I always find that this channel and Brian Cox are the ones that really explain things in a way where the information doesn’t feel daunting, even though it is!
If you think you have a good understanding of it, it means as you don’t have a good understanding of it yet :-)
It’s probably a simulation.
Because of gravity time dialation according to outside observers no matter has ever or will ever fall in a black hole. Because of that current black holes do not have a singularity at the core and instead are formed of layers and layers of mass frozen in space time. Its debatable if it's possible to cross event horizon. Maybe all mass gets obliterated and released as energy instead.
👍 Good question! It's still an area of ongoing research and debate.
@Baneslayer™ The observer I'm talking about is the physical therm. It doesn't mean you are actually seeing anything, its more of a reference frame. For example if you have two clocks side by side measuring the same time and throw one in black hole orbit it will slow down time and tick slower because of gravity time dilation. That is according to earth observers. According with an observer on black hole orbit time did not slow down for him and its the clock on earth that is speed up. The closer you get to the event horizon the slower the time passes according with outside observers, once you reach event horizon time stops completely. Only crossing observers can see clocks ticking inside a black hole but that can only happen if Hawking radiation is not real. If black holes emit radiation, all matter falling in the event horizon will be converted into radiation over trillions of years, "Crossing "observers would experience this in a fraction of a second and be instantly obliterated. I'm not the best person to explain this, If you want to know more about this look up on yt channel BPS Space Time.
What you are "observing" and what is a actually happening are two different things. You are confusing them in this case.
Great content! 🤗 Thanks for creating such an interesting video!
Incredibly well done and brilliantly simplified explanations + thought process of this content. I’m an avid watcher/reader of science & space news/explainers, and this is genuinely one of the most (if not THE most) well put-together pieces on black holes I’ve seen. Really great work. Been a subscriber for awhile and just wanted to say you’ve really hit your stride! Enormously impressed - thank you for the content!
If we could create a craft to get as far as our nearest black hole I wonder how close you could get to observe it without been pulled into the event horizon.?🇬🇧✌️
That would depend on the speed of your craft ! The faster it goes, the nearer it can get without getting sucked in
This is a perfect example of amazing video! You have explained many difficult topics in a very simple way. Great job!
Even though I’ve already seen the individual episodes, I am still amazed at the effort and quality you put into making these. One thing I wish was explained in more detail was the section on Hawking Radiation, where you explained that it is usually depicted at the event horizon, this isn’t the case. However you didn’t explain WHY it wasn’t the case and how some manages to escape the other when outside? Thank you so much for the videos!
26:56 "Space tells matter how to move. Matter tells Space how to curve." - John Wheeler Such a profound quote that helps to make clear such a complicated subject such as Black Holes.
You have such a great voice narrating describing these videos. I love watching these videos to wind down my day and relax watching the universe being explained by Alex. Keep up the great work. ❤
I hate it
Great video. Thank you. I have interest in astrophysics and astronomy all my life. Idk if I'm paying more attention now but it seems I learned more about black holes in this video than I have ever learned. Wonderful.
This kinda turned into a rabbit hole in my mind and I had to get it out. Not an expert but this is all just based on what I think would happen and what sounds like it makes sense. So if it takes an infinite amount of time to enter a black hole, so much so that if you tried to enter, the entire universe goes through it's entire lifetime, how does a blackhole gain mass? If it's true, then any object that gets sucked into one would never reach the center in the universe's lifetime. Yet we see absolutely monstrous sized blackholes. Which had to have grown, unless they are from stars the size of the universe, which does not seem possible. Also, if a black hole is truly infinitly small, then you could never reach it to add mass to it either. My thinking is this. If you want to see for example an atom. You zoom in. We have electron microscopes that can see atoms. You can see the outline, and if you wanted to touch one, you simply have to move towards it a set distance. Now imagine a point infinitely small. You can zoom in forever but you will never see an outline because it's infinitely small. You want to touch it? (Metaphorically as you would die if you tried to) Well, how far do you move your finger towards it? Move your finger close to it, zoom in, and because it's infinitely small the space between your finger and the black hole seems to increase. Move it closer again, now you are almost touching it. But zoom in more, and once again you are far away from it. My point is this. Even if you were a foot away from a black hole, you would have to move an infinite distance to get to it, since it's infinitly small. Again this adds that a black hole cannot gain mass, as any matter that could possibly make it there, after traveling for quintillions to the quintillions to the quintillions to the quintillions of years, would never reach an infinitly small point, as it would have to travel an infinite distance. Basically all I am trying to say is that there is no possible way a black hole is an infinitely small point with an infinite density. Math may break down as you try to calculate how small it truly is, but that doesn't mean it's infinite. My theory is that whatever makes up matter, not protons and neutrons, but quarks, or whatever makes up quarks, or whatever makes up those, etc, down to the tiniest possible form of matter, is squished down to as close together as possible. Into an object with a finite size, and a finite density. This would mean a black hole can gain mass since objects can actually touch it, and add to the pile. But also it can't gain mass, or at least we will never observe a black hole gain mass, as it would take such a large amount of time to reach the center. And if hawking radiation is real, the black hole could fizzle away before the matter could actually get to the actual black hole. But now that I think about it, how can hawking radiation exist if these subatomic particles pop in, and part of it falls down to the black hole, and the other goes out as radiation? Ok I have just thought about it for a minute here and this is what I think. Hawking radiation could be a source of near infinite energy. Near infinite because nothing is infinite. It would be infinite for humans on a human scale. So hawking radiation is when 2 tiny subatomic particles pop into existence, one falls into a black hole and the other escapes it. We see the escaped particle as radiation, hawking radiation. Now the particle that falls into the black hole will eventually reach the center and annialate the equivalent mass. But that will take forever. It will only reach the center after the universe has come and gone. And probably many times that. So the black hole won't lose mass for quite some time, all the while thermal radiation is being spewed out of the black hole. We could use this for near infinite energy. We have a constant flow of heat, and time so long that humanity would likely be gone by the time it starts to lose mass. So I guess black holes do gain mass, and do lose mass, but for both to happen, the end of the universe must take place so there's enough time for stuff to fall. So now the question is how did some black holes get so massive the entire solar system could fit insite one many times over? It couldn't have been from eating things because it will not reach the center for a while. I guess if matter accumulated on the outskirts it could increase the gravational pull. Ok I am done thinking this over. My head hurts and I've been sat here for probably half an hour to an hour now. If you read all this I am sorry. But I hope your head hurts as much as mine does. REMEMBER, VERY IMPORTANT, I am not an expert. I am just some guy trying to use my tiny feeble human mind to comprehend the cosmos.I would love to hear your theories on everything.
Nice thought, good read!
@impyboi pretty much all of them admit we don't know much about them outside of the fact that they're gravity is so strong not even massless particles like photons can't escape which is what we've seen from the recent photographs.
You’d be correct about the Hawking radiation being EXTREMELY efficient though. The only thing is how to extract it and also get enough of it to be useful:b smaller black holes more likely.
@John Kean seethe science denier
Thanks for making this a bit easier to understand... Although, a lot of this continues to make my brain spin in a fog, your explanations has helped me to at least grasp part of the concepts -- even if they are just theories.
Excellent video. As a Physicist myself, I can only be grateful by the thought process that led to it.
Physicists should stop lying to people.
Congratulations 🎉🎉 Thanks for watching to my youtube channel! you have been short-listed among my winners🎁🎁🎁🎁 kindly text the name above to claim ✅✅✅.....
There is no such thing as black holes. They are spheres like earth with a surface. Obviously if uranium is the heaviest element in nature on earth , gravity can create something more intense in a dying super giant . Obviously it's too far away to reach such objects and Obviously you couldn't retrieve anything from its surface.
Thank you for taking time to create this series! Excellent all around....content, graphics... very articulate, easy to understand, adding a bit of humor. The best of any similar I've seen yet! 👍😜👍
What is nothing is my favorite question. I tend to ask people this question and then deny all their answers because they have just described the nothing and thus turned it into something. But one guy surprised me. He answered: Nothing is what blind sees. I don't know about you guys, but I think that this is the closest to nothing you can get.
The supercut of the Black Holes series! All the episodes were written in a way that this supercut could happen once the series was over. I hope it works and it feels like a seamless, epic Astrum episode :)
So, episodes made of black holes became such a gravitational factor that they emerged into one giant and massive episode of black holes. It created gravitational waves that were detected at LIGO.
It’s great thank you, I love listing to space themed videos while going to sleep, it helps my insomnia
Alex ypr way of talking the universes marbles from a cientific view is so friendly Yes this large cut felt seemesly as if it were made as it is, i knew it was from shorts as ive seen s99me of the parts separately , thanks for all your work and effort for science divulgation
I don't understand how black hole can pull a light . It's not supposed to do that because light doesn't have a mass . It will make a sense only if black hole pull a eter in which can be propagated light .
Yeah I think they work very well. The only thing is a slight change in the tone of your voice but I mean that's fine.
Thanks so much for the video! The part at 7:37 blew my mind because I had to idea of the true scale of M87's black hole; so immensely larger than I originally thought.
The ability to condense information and present it in such a way that even someone with no prior knowledge of physics can understand is incredible.
Nice work. 😎👍
Absolute great video. Interesting and very well narrated and researched all the way through. Thank you!
So interesting. I often wish I had been smart enough to go into a field of physics, having a passion for it just isn’t enough.
Thank you for the wonderful video. It inspires me a hypothesis on a possible material mass that may exist that can affect space and not time.
Amazing video. Great editorial judgement in what to keep in, and on what topics to bypass! Great job. Loved it.
OH, Wow! Hands down the very best description I have ever heard. I’ll be thinking about this for awhile. We need more X-ray detectors out there, more powerful. Sofia the telescope was heading in the right direction too. It could see magnetic fields on a galactic scale. Sharpen that tool!🙂
THANK YOU! I have been trying to understand how an infinitely dense "one dimensional" point outside of space-time can have "spin". Although I think it's hard to say that the actual black hole has spin, after watching this I think you can say that the black hole system (including the space-time outside influenced by the black hole) can have spin or angular momentum. I think the idea of a ring-shaped black hole looks like some kind of cheat or compromise but I guess it's a best-guess right?
Exactly, you’re asking the right questions. Here’s the solution: there is not crossing the event horizon because black holes are literal holes in reality. Everything is just above the event horizon. It would take infinite time to reach the event horizon, and even more than infinite to cross it therefore impossible.
Been a longtime fan. You’re what makes youtube great. Thank you!
Thank you so much and for sticking around!
Great video. Other science channels seem to go the other way, shorter clips, entertaining ideas ("Startrek") so i am glad i find this: keeping it exciting with facts and good explanation. gonna watch it in cuts of 10-15 minutes!
Black holes have to be my favorite thing in space. They're so terrifying and mystical. Powerful and unbias. Anton has a video about vortex structures on them too. They're so neat.
@Abu Ansar Al-Britani They really suck.
Notoriously bad tippers and always give our servers a hard time
Ye, I love em. Got one as a pet.
That's the one thing about black holes that always blew my mind, the fact that you could technically see the entire lifetime of the universe in an instant. It's just such a difficult thing to wrap your head around
All while your head gets spaghettified and wraps around the black hole * mind literally blown *
Nice! It's mind-boggling 🤯.👍
Thank-you for this, as I've always found space and the Universe very interesting! Ever since I purchased a used copy of Carl Sagan's Cosmos , or Steven Hawking's book A Brief history of time, while I'm a layman as it were, I can still understand most things , until it gets too bogged down into quantum theory or string theory! but even then I do understand the basics! I think I'll check the rest of what you have to offer, again thank-you!
Hawking admitted most of his theories were utter twaddle before he died.
I'm always amazed by the quality of your content, it's just a pleasure to watch despite the highly complex topics. Btw congratulations to Anton Zeilinger et al. for being awarded the Nobel Prize in Physics 2022 for their contributions to quantum theory!
@Cerulean Angel I have a bad habit of typing when tired. I usually only mix numbers and letters in algebra.
@chris kelly lost me at polar1z1ng th1ngs lul awkward flower 1n a sea of wet kelp do rem1nd me of elrond poetry tho
@J B or the fact that e1ther way 1ts just extreme ends of ethos one person must be r1ght wh1le the other must be wrong surely 1 mean surely r1ght? fk1ng hell 1f 1 know anyways
@chris kelly touch grass.
@J B We are apes anyway, kladistically speaking. Apes with very special skills, of course.
This has to be the most comprehensive and detailed explanation of Black Hole and its properties anywhere in a single video. Enjoyed every single bit of it, even though it will require basic understanding of many concepts of Physics. You have cleared many of my doubts. Exceptional video and keep making such top-quality content specially in these 1 hour long formats.
No such thing as a black hole don't be fooled.
Absolutely brilliant video! Explanations were better than I’ve ever heard. I’m subscribing to your channel my good man, I look forward to more!
Taking into account the relativistic slowing down of time when approaching the event horizon, falling towards the event horizon, one would see the entire universe life unfold, while at the same time the blackhole evaporates to Hawking's radiation. Therefore nothing can ever cross the event horizon. That means there is really nothing inside a blackhole below the event horizon. So there is no singularity at the center of the blackhole.
Thank You so much for your videos. Really educational for us peons that are interested in this sort of subject matter but are limited in our math and science backgrounds.
Your work is phenomenal, monumental and important. So much better than what commercial cable channels were pushing out not too long ago. Where were you, dear teacher, when I grew up? You bridge the YouTube audience with very complex topics. Even if 30% is understood on an average, that’s an amazing feat considering the abstract concepts discussed.
@deepvybes I've not seen this video yet, its an hour and its on my watch list when i get time. so i can't attest to the depth. the title sounds interesting I'm assuming it is about the currently things that are unknown, were mistakes and new developments. sounds like its not worth the watch. i prefer channels like anton's where he covers new research. as for tv making money, these channels are also making money. 550,000, which is about average cpm is 1100 dollars considering this is a video that re-updates content not too bad. youtube is also a business for channels like this. over 1mil subs, constant uploads? this isn't a hobby.
@vacation time The stuff in this video is all basic Wiki page info, there's nothing you haven't heard before if it's not your first time hearing it. Aside from the fact he used a balerina instead of a figure skater (her poor toe must have blown to shreads). The problem with TV is that they don't want to put all of the info into one episode, they want to make money, make it a business, release something new in each episode to keep people watching, and do something more than read a wiki page.
@Excellent 8th RULE: If this is your first night at FIGHT CLUB, you HAVE to fight.
@vacation time The first rule of fight club is we don't talk about fight club. The second rule of fight club is we don't talk about fight club.
In the same darkness we were😂
By far the best, most informative black hole documentary I've seen. It goes into way more depth than so many of the others. But it does so in terms we can all understand 👍
The radical time displacement at or approaching an event horizon is proving to be a challenge for theoretical physics.
👍😊 That's fascinating! It's an exciting time for theoretical physics!
Agreed, for sure
I always wondered if sonic tests were ever used as an analog for light. I would like to know what other kinds of sonic tests were performed and what the results were. I've got a few I'd like to try myself.
Infinitely interesting! What an exciting time to be into cosmology, astronomy, astrophysics, etc. It seems like there a library worth of new research published and ready for even popular consumption (dumbed down or simplified) every week!
No research just fantasy. YOU could have a better theory in YOUR brain.
Wow, that was epic! A fascinating deep-dive into the mind-bending physics involved in black holes. Thanks bunches for doing what you do.
Star Trek science ie phantasmagorical / fiction.
Absolutely stunning video! Great job,Alex,i love it
And thats how Hawkins broke physics.
@John Kean Do you have a specific source? I'd like to read that.
He admitted before he died most of his theories were impossible. No such thing as black holes.
So many good explanations in this video. Probably the easiest to understand rundown on quantum field theory I've seen to date.
That idea of the photon being a wave propagating through the quantum field blew my mind... totally changed the way I view everything!
Another great video. Appreciate it, Alex. Love the 4K 60 fps. Will donate more in the future and hopefully this comment gets others to throw you a few bucks.
Thank you so much!
I might not understand everything but I like everything universe related. Thank you so much for a very interesting video!
This is by a mile the best video on black holes and, actually, quantum physics, out there
You are really skilled at making difficult to grasp topics really digestible to the lay person! Thank you!
👍 Great insight! 😊
You know, it’s strange but I can hear your smile in your voice. Your love for astronomy is so infectious. Keep up the amazing work.
Hey, Alex, not sure if you've already answered this question, but, have you already considered doing a series on the different Soviet missions and programs? I recently learned about Soviet missions to Venus and the Buran program, and it blew my mind! It'd be great of you consider it. Thanks for all the great content.
Im only 4 minutes in and I have subscribed. Your explanations and imagery to help are incredible. Black holes have to be the coolest things to ever exist
This is an excellent black hole presentation. Filled with fresh ideas and theories.
Thanks for your efforts and the quality of the content. Note however. Weight is not mass.
This is definitely amongst the best science channels on YouTube.
Discovering your videos tonight has been a real treat. So very well done. So very interesting. Thanks for making my night!
When was the last time anyone from Earth lived in a black hole?
No, not yet! 🤠
This is so far, one of the best videos that I have seen on Black Holes yet!
hey, would you say we are in an "event horizon" already, seeing as the majority of even relatively near things expands away from us faster than we could ever travel?
Watched it all, amazing content that I hope you know we all appreciate making it available for us.
Thank you :) > 32:00 This is pretty much what I have believed since I was 8 years old. It's not intuitive or easy to think about in a 4D universe, but we have to question which is real like looking at the image in a mirror. We think of up and down in and out as not being interchangeable at the same time, but I suspect the universe allows the infinite center and infinite exterior to be one and the same at the same instance and interchangeable. In this scenario, black holes make sense, and it points to universes existing within universes. But as we see by Hawkins radiation, a universe can slowly leak back into the inverse that contains it. In some sense this can make the universe infinite and yet still have a definable size. 43:21 I am often criticized for for talking about faster than light from an external perspective, as if that external perspective can never exist, yet here you are talking about light traveling faster than the speed of light. Why can people just accept that light, or probably more correctly Space/Time can travel faster than the speed of light. P.S. This warping of the frame of reference etc and Space/Time flipping states is why I suggest you would emerge from what would appear to be the center of the black hole, not indifferent to emerging from and inflationary period. Yes, weird I know.
@ 24:30 -- now make the box 10,000 km tall. Shine 2 lasers square with the floor - one near the top of the box, one near the bottom. If the deflection is the same for both lasers, then it is you who is accelerating. If the laser at your feet is deflected more, then you are in a gravity well. And this has nothing to do with mass inside the box. Same thing (almost) for angular velocity (with mass this time). The force on the mass near the floor will be greater than at the top. Your thoughts . . .
Oh, I know the answer to this! It depends on whether or not the box is only being accelerated at the bottom, and the compressed walls of the box propagate the force up the 10,000 km to the top of the box, or whether or not the box is continuously accelerating with the exact same amount of acceleration at every single point along the 10,000 km long box. In the first case the two lasers deflect by the same amount, in the second case they will deflect by different amounts. I'd explain, but Im going to bed now. Lookup Rindler Coordinations and Born Rigid Motion.
Great video! If it weren’t for the labels, I wouldn’t have even noticed that there were 6 episodes! Good show!
Impressive work and very useful information. Thanks.
Absolutely amazing I love ASTRUM! Easy to understand yet so comprehensive. Keep it up.
As a skeptic to a lot of the "so called" Sciences, I very much appreciate your approach and the way you relay the message. For example, I'm glad you said that Hawking Radiation is only a Theory. Thank you and this is why I subbed and will continue to listen. I find it extremely difficult to listen to someone who treats ALMOST any and every Theory as an absolute fact. I might not always agree, however, I can still hear the point being made if it is being made logically.
This is amazing, you learn a lot more than just stuff about black holes! Cheers
I've wondered if a black hole could be somewhat synonomous with an ocean gyre, where a confluence of moments/mass, or currents, come together.
I've never thought about light traveling ON something! This video helped me tremendously, thank you! New sub
👍 Thanks for the kind words! We're glad we could help you look at the universe in a different way.
"You cannot know the location and direction of a particle" , at some point , this will be proven wrong. When the people at that time reach this understanding , other questions about particle behavior will be explained as well.
Cool video. It helped reinforce my own thoughts on the universe.
This is an easily digestible video I love it!
This is by far the best explanaition of black holes i have seen. I'm not a scientist though. There is one small typo in the magnified quote of the Hawking "letter", where the "-6" would have to be superscript, as it means an exponent of 10.
Very detailed video! I really appreciated it. Thank you for that good work
I'd long thought the jets were the result of magnetic forces and it's interesting that idea occurring here as well.
I love these videos. I instantly feel larger for having watched them.
Very detailed yet easy to understand video. Wonderful job.
Excellent video and explanation of things, thank you.
I love the graphic where you have a light beam represented as perpendicular magnetic and electric fields - the idea being that the expansion/contraction of one leads to the contraction/expansion of the other. But, you're 90 degrees out of phase. Think about it.🤔
Do you ever (while walking in a straight line) imagine that you are stationary and the Earth is actually rolling beneath your feet like an acrobat upon a giant ball? 🧐
14:36 I have a question, it's about particles "appearing and disappearing" in and out of existence. I just can't believe in things just spontaneously popping in and out of existence. Would it be possible that those particles are just traveling through a higher dimension while they "disappear", only to "reappear" once their orbit takes them back through our dimension? I see it like this: Imagine you were observing a 2 dimensional universe, if a particle's orbit through space/time was perfectly aligned with the 2D plane then you could observe the entire thing from within the 2D space. However if the orbit was just slightly out of line then the orbit would take the particle outside the 2D plane, which to a 2D observer would look as if the particle popped in and out of existence. Meanwhile a 3D observer would be able to see the entire orbit. So, could it be that particles simply aren't perfectly aligned with 3D space and as such move through a higher plane in their orbit, thus seemingly appearing and disappearing from 3D space?
Interesting thought! 🤔 Seems plausible but only more research could tell for sure.
Amazing quality! A very nice supercut indeed! I was a bit surprised when you said: 'After all, this is just a theory'. In my opinion it feeds into the misunderstanding of the word theory. It was around the 30:00 minute mark :)
Wow, I watched a video about how electrons don't spin but have angular momentum. I didn't understand it until I watched this video, even though this video is about gravity. Now I think I understand it slightly better. So, does curvature also cause the angular momentum of electron "spin" as well?
10:16 yes yes yes! I have often asked this exact question, and a friend asked the same some months back. Thanks for taking this one on! 🙏
As always. a very well-done video.
Someone once showed me a video that likened the spacetime inside the event horizon of a black hole to the space-time kf the universe itself. I question how far the analogy can go - but if it goes far enough.... is there an analog of Hawking Radiation outside our universe?
I always enjoy your content. It's clear and presented in a way that avoids the "gee wiz" tone of so many science channels. Yet, I don't feel like you're talking down to me or that I need a degree in physics to understand you. This was an excellent series on black holes. Thank you for putting it together. I can't wait for your next video!
Nicely said, thanks for the kind words! 🙏 Also, looking forward to the next video too 🤩
This is the first time I'm falling asleep to something I consider really interesting. Well made, sir... Well made.
The biggest question about Hawking radiation is: If virtual particles appear and cancel each other out in deep space. What makes them appear? If the black hole energy makes Hawking radiation happen. If the resonance of light through deep space can cause this , then light being pulled into a black hole can as well, thus no energy is used by the black hole. It obtains part of the "virtual particle" and releases the other half into the known universe.
At 40:58 they present the concept of a photon sphere "In a zone just outside the event horizon there exists a point in space where if a photon enters it at just the right angle, it will enter a perfect orbit around the black hole in much the same way the moon perfectly orbits the Earth. This infinitesimally thin zone is known as the photon sphere," This part is correct though I'd not use the term "perfect orbit" "and given the number photons that have flown past black holes in all the millions of years they have existed, it is probably filled with photons." This is just wrong. Even in an idealised universe with only 1 photon and the black hole this orbit is not stable. The black hole radiating Hawking radiation would cause the photon to slowly spiral out as the black hole looses mass. In our universe it is even worse because the orbit of the photon is affected by so many other factors including a black hole gaining mass just from absorbing radiation from the CMBR. No photon could sit in that orbit. Perturbation would cause it to spiral in or out. I hate it when just blatantly wrong statements are made to try to drive home a point.
@Steven Huang PBS spacetime is the literal worst when it comes to pop sci idealist immaterialist garbage, it consists entirely of all of those theories which are completely debased, the shining example of "Mathematics leading us astray". To think that its a "Deeper channel" is completely asinine
This is a reason I've unsubscribed. The channel is very pop sci and non-technical. Instead look to deeper channels like PBS Spacetime. Astrum has videos with lots of inaccuracies like this and are good only for surface level entertainment.
I dont see your point really. Space is Filled with photons in every direction to the brim - especially towards the cores of galaxies where so many blackholes reside. Here -- the photon spheres which forms - if it were to lose any photons, are INSTANTLY replaced by the next layer of photons waiting for an open spot. Thats literally what the black hole IS . The reason its invisible is because the photons just orbit it rather than reflecting or scaterring , they just loop around forever. A lot. Another thing. Just because its a photon sphere doesnt mean they touch other photons very often. You can fit a lot of fucking photons in a 1 km sphere man. At least a photon can likely survive in a closed loop orbit around a black star for "long enough", and are ejected out one by one over time in such a way that you basically wouldn be able to tell if a photon you observe came from a black hole or not. Its just a photon - it doesnt have some special "black hole touched" quality. All of the original baryons that were originally in the star that created the black hole can be crushed back down into pure photons inside the black hole. Over time, it can lose photons, it constantly gains new photons and loses them occasionally. No big deal. They dont simply fly away because the pressure of the current of photons moving towards the blackhole is like a river flowing in a definite direction -- Inward at an angle. One doesnt simply swim against the current without some reason and some force acting on it to do work and overcome the weight of the photons going towards the center.
Superb writing and presentation. Even you're voice is endearingly quirky in its sophisticated way. Can't wait to hear some comedian's first Alex McColgan impression!
24:28 The acceleration due to gravity at the ceiling would be slightly less at the ceiling of the room sitting on Earth while the other would have the same "gravity" on the floor and ceiling.
First of all, the highest praise for this fascinating video. As an absolute non-expert (I'm an engineer, not a physicist) I feel your video has multiplied my qualitative understanding of black holes. A small constructive criticism: at around 51:30 your explanation of why it is difficult to fall into a black hole seems to have an internal inconsistency that might leave some people scratching their heads. You say that the hands of the ballerina stay at the same speed when she pulls her arms in, hence her body rotates more quickly, but when you talk about objects falling off-centre into a black hole you talk about them increasing their speed up to close to the speed of light. I get it that you didn't want to trouble your viewers with the details of angular momentum, but also note that you had no problem showing us the Hawking's radiation formula :-) and his paper, neither of which I had seen before, but found very interesting btw.
Novice layperson's question: How do non-rotating black holes form? Since stars rotate, wouldn't that momentum always be preserved if they become black holes?
Very informative... Interesting video... Excellent way of explaining things....
I watched all these videos when they came out. It was a pleasure to rewatch them all like this. Black holes seem, to me at least, like a glitch in the universe; in reality. Like getting outside the playable boundaries in a video game or an error in a program that just breaks one button while the rest continues to work fine, black holes seem to be some kind of functioning error in the universe. It's like the universe popped into existence, all the rules were set by physics, all the forces of nature emerged, particles came into being, and everything was fine. There. That's a perfectly working universe. Enjoy. And then some cosmic speed runner or data miner comes along and, without breaking any of those rules or forces, causes the universe to do this strange thing that was never intended. "So, this universe runs on gravity and time, right? What if I put a whole bunch of that in one spot?" So, this cosmic hacker tinkers with the programming and discovers planets. "More," he says. And there's the first stars. "More." Now the stars get bigger and heavier. "More, more, more!" Suddenly that spot goes dark. The code of the universe breaks down and there's a spot that technically obeys the laws of the code but ...just doesn't make any sense. And even though this glitched spot now exists, the rest of the universe keeps functioning just fine around it. I need to stop before I write a whole novel.
There are no glitches in reality, there are only edges of reality, which cannot be crossed by definition because there’s nothing beyond reality. Black holes are literally holes in reality.
they're what happens when god divides by zero.
I've always said that Black Holes are the real world result / consequence of dividing by zero, but your point of view is way better and more on point.
no, no, keep going
excellent comment, i've thought along the same lines for a while but never actually put it all together. enjoy your day!
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