My full title is Dr Robert Eagle CBE BSc PhD. I studied at Kings College London, BSc Physics and PhD Nuclear Physics. And if I can do it, then so can you. All good wishes for your continuing studies and for the future.
When did you complete your BSc and PhD? And what was the topic of your Phd thesis if you don't mind me asking? Not that you'll respond but I'll be grateful if you do as I'm quite curious
Your videos are simply amazing. I have nothing to do with this type of physics, I'm a petroleum engineer (so more like fluid dynamics and things), but I am very interested in relativity and quantum and particle physics. It all comes from my love to cosmology and craving for answers. I feel my life is wasted. Started studying systematically on my own and bumped into your videos. Fell in love immediately. You explain so well. Keep up the good work! Thinking about changing career, despite I like petroleum eng. I couldn't financially support one more degree at 25, but have been thinking about astrophotography. Thanks
DrPhysicsA Why when I read about Hawkings radiation I only find that positive particles escape, couldn't it be balanced by the opposite, negative particles escaping and the black hole gaining mass ?
+John Snow actually when the antiparticle - particle pairs create up in the vaccum of space then somehow the antimatter get some negative kind of energy its not negative i mean its sign is negative as we know that if the force is negative this means its attractive. Maybe like this the antimatter falls not the particle. But again one question again arise why the antimatter only gets negative kind of energy not the matter in this case i also. Dont know.
Simply AWESOME! I've been looking for an explanation to Bekenstein formula for MONTHS, in order to understand the Holographic Principle. THANKS A LOT, you made it so simple, you are amazing. Greetings from Argentina! :D :D
I love the way that you simplify this information, so that anyone with a basic understanding of Algebra can understand, what otherwise, seems so complicated. I honestly feel like watching your videos has raised my IQ! Ty so much!!!
I read the following comment about Stephen Hawkings passing in a muslim community: "SubhanAllah ... Alhamdulillah ... I am elated for Utz Abdul Rahman to give his khutbah on Steven Hawking. He was the frightening figure to me but who was an examplary figure to my husband. I used to hear about him for many years during our married years. When someone whom you are married to admitted that he is an Atheist the whole world that I used to know seemed lost & crumbled. I have to battle with this mountain of a man bringing up my two children alone as a Muslim in a predominantly a non-Muslim country. Even writing this brought tears of sadness to the forefront ... how I struggled through with my life and Alhamdulillah I made good choices and considered myself to be successful in Islam. Even as recently as last year my two sons said, Must be tough for you mum to bring us up but we love you Mum!!! " 😢💞 Alhamdulillah ... I am so glad that Steven Hawking is dead! May Allah Protect All Muslims not to stray from the straight path to the hereafter ... Aameen Ya Rabb JazakAllahu Khairan Kathira Utz Abdul Rahman I heard two days ago that a sister has been murdered and Islamoebia is on the increase in United Kingdom... MaasyaAllah." What's your take on this?
I always taught Black hole mathematics could only be understood by a prodigy. You simplified iT so even highschool students can understand. Thank you Robert
best description on black holes I've ever heard and beats everything I've read about them so far! Thank you for taking the time to go into this as throughly as you did here!
I just wanted to thank you for your great lecture. I really just clicked on your clip just to see what the clip is about and I found myself listening to your entire lecture. You truly explained the theories in a very interesting and simple way! Thank you! Can't wait to see the other clips!
Sir...this is possibly the best explanation i hv ever seen in my life..the u hv put up the freaking mathematics and the way u hv merged it wid the cosmos,i believe that u truly deserve at least a compliment...keep it up😄
I sincerely appreciate the accuracy and detail in each of your videos. You are able to convey a grand amount of pertinent information in very little time. Through conceptual ideas and examples you are able to explain complex theories in physics (and other subjects) very effectively. I wanted to let you know that your attention to detail and effort does not go unnoticed :) Thanks a bunch! Merry Xmas!
How would the mass be 'associated with...Hawking Radiation'? What does 'associated mean' in this context? 'Hawking Radiation' is a hypothetical black body radiation based on zero experimental evidence. It has nothing to do with masses falling into 'black holes'.
Now I can guess but as I said years ago you are the best. I feel honoured that once you answered my question some 7-8 years back. Your versatility might have brought you everything that you could have wished for it has lost us you. Best wishes.
I found one of these down the end of my back yard. I came online to try and learn more about them. I kept throwing the garden clippings and raked leaves in it for the last few weeks, will that be a problem? Does anyone know how to get rid of one? I've lost two cats to it and three cricket balls. It's starting to become a bit of a pain in the arse. I think maybe it was my neighbor; finally had one too many McFat burgers and imploded into a singularity.
DrPhysicsA - In the Alice and Bob explanation, you kind of tricked us there. In the example, Bob always sees Alice as slowly approaching a point, but Alice has no problem in seeing Bob, i.e. The Accelerating person has a perception of the constant velocity person as getting slower. When you moved towards the Black Hole counterpart, you reversed it by saying that the person who is observing from outside sees the person in the Spaceship getting slower and slower. Shouldn't it be the opposite? Shouldn't the person in the spaceship (like Bob) see the outside observer (like Alice) getting slower as the spaceship approaches the Black Hole, but the outside observer has no problem in seeing the Spaceship enter the Black hole and eventually get destroyed? Isn't it?
Mudit Sinha no, he got that right bc the gravitation makes bob (spaceship) to increase his speed by pulling him towards the center of the black hole, so his speed is increasing so it's like the diagram he showed us before
what is that point Alice (from Bob's perspective never) crosses, and after which she is not visible to Bob? What is that crossing? It seems totally irrelevant. What is it?
I'm still confused :( first Bob is fast and sees the slow person go slower .. then Bob is fast near the black hole but the slow person sees bob get slower :(
@@yugojyotimuna2383 and Mudit Sinha : Yes, the analogy with Alice and Bob cannot be made directly to the Black Hole scenario, because the the presence of the BH distorts space-time. i.e. the Euclidean / rectangular co-ordinate grid of Alice-Bob cannot be used. A Penrose diagram is used instead. See : th-cam.com/video/mht-1c4wc0Q/w-d-xo.html for a lay introduction. But, it is still true that Time for the victim accelerating towards the BH moves slower and slower RELATIVE to the observer's Time. In effect, the observer never sees the victim cross the Schwarschild radius / Event Horizon.
A delightfully clear and fascinating video as always, DrPhysicsA never disappoints ^_^ Just out of curiosity, do you think it could be theoretically possible to some day work out so clever a formula that the infinities would cease to be a problem and we could obtain more detailed information? I ask at least partially because I am vaguely aware that similar issues occur when trying to reconcile relativity and quantum mechanics, and wouldn't be too terribly disappointed if such problems were solved within our lifetimes. Please forgive any obvious face-palm worthy facts I may have overlooked, I'm just watching these videos out of curiosity after a month or two out of the game.
pupil; metaphore .. steven hawkings and the end of Alien 4 .. And I write that with due respect to Steven Hawking .. In his mind .. the escaping particles are thoughts .. how we speak with our eyes ..
Phillip, Charles Ashwood-Cann It's "Stephen Hawking", and science fiction films have nothing to do with him. Escaping particles are not thoughts, my friend. Where are you getting this ridiculous information?
Prince Istalri There are some coordinate systems and other geometries that allow for infinite to be conceptualized, however I suspect that they do not fit the paradigm that you are looking for. Hyperbolic function are drawn on a circular graph, the boundaries of which are representative of infinity. A curved line on a hyperbolic graph, is actually a line in cartesian 2-space and is made to intersect the boundary at a right angle, meaning that it tends to infinity. Although this allows infinity to be placed at a distinct point in space, the scaling on the line becomes gradually smaller approaching zero as the limiting value as the visual distance away from the boundary also approaches zero. This does still leave a problem with infinitesimal values but the point, after the dilated discussion, is that infinity may be beyond our conceptual boundary, but it can still be talked about and, to a greater or lesser degree, be understood! :)
obiwan042 Thanks ^_^ Infinity is intriguing, but seems to be one of those things that "breaks math", so to speak. The best we can do is sneak up on it using limits or infinitesimals; it's nature in certain scenarios can be discerned with these techniques, but you can't actually get to it and directly work with it, which is something I've always found oddly fascinating. Perhaps the next Euler or Gauss will be able to formulate a way to work with infinity, but for now, I guess we just have to deal with the limited understanding of it we can obtain.
Very well explained and written and calculated! Many thanks. It always helps to digest the information by writing it down in (as) simple physics as possible!
Fantastic video!! Thank you do much for creating these; I'm sure it's very time-consuming, and you can see a lot of work goes into them, so it's truly great of you to do it :)
You're talking about advanced concepts, but you're making what we MIT graduates consider freshman-level mistakes: 1. Confusing definite and indefinite integrals; 2. Using formulas outside the ranges in which these formulas are valid; and 3. Confusing arbitrary choices of scale with real physical phenomena. Your reasoning then elaborates these errors into absurdity, which you don't recognize because black holes really are weird. The force of earth's gravity decreases inside the earth, falling to zero at the earth's center. The formula for gravity isn't valid for r less than the radius of the earth. Potential energy from earth's gravity is only zero at the center of the earth; it's positive everywhere else and has a finite, positive maxium at infinity. (A light-year is close enough to infinity to be infinity for almost all practical purposes.) The gravitational potential energy of a mass on the surface of the earth is something large and positive, maybe over half of its potential energy at infinity. The formula for the sun's gravity is invalid for values of r less than the radius of the sun. You take formulas that are only valid for r values greater than thousands of miles and then draw conclusions from them as r goes to zero. That's nonsense. If the truth is more complicated then talk to a real physicist and make things more complicated. Your errors make me not trust anything you say
Not only that, but his transition from the graphic explanation of Alice and Bob to the point about black holes doesn't make sense. If you take up the graph, the light from Bob does reach Alice. So it would mean that Alice can see Bob crashing into the black hole. But she doesn't, because the physical properties of the black hole doesn't let light travel out of the swartzschild radius. The graph doesn't illustrate the point at 40:20 at all, it serves no purpose in this video. After trying to demonstrate it myself to friends, I realized that the point made with the graphs doesn't make any sense when talking about someone who entered the radius of a black hole. I'm quite disappointed...
Thank you for this invaluable information. I need to re-watch this to really pound it into my brain. I'm not going to school to be a physicist but physics itself has always fascinated me and I've taken the red pill ever since grade school.
Thank you for this concise, clear explanation of black holes; you managed to first introduce new concepts and THEN apply it to the physics of a black hole, which helped me understand those processes. Wonderful video!
I genuinely wish I had the intelligence and skill to come to these conclusions myself. I know the general rules behind Black Holes but to see the math representing it explained makes me genuinely want to get in this field. I'm glad I discovered your channel and not only did I subscribe but now I'm making a genuine effort to get better at math.
@DrPhysicsA If a negative/positive energy pair can be created and the negative energy particle fall in while the positive energy particle escapes, why doesn't the reverse happen and completely balance out the process? Why don't we see negative energy particles being radiated from black holes?
I like how he doesn't even bother to put multiplication signs🤣 just like any real physicist will do .no tume for stupid signs just straight to the point. Awesome video actually i learned how we can squish earth to under 2cm to make it blackhole in my 11th grade physics class... U r videos are pure gems...keep up the great work.
A very good video that explains the basic concepts and maths behind those concepts, of black holes, it has given me a better insight into other videos and information on the subject. very much worth watching if you want a bit more information about black holes without need a degree on the subject to understand it. Many thanks for making and uploading it free to view!
Simply a wonderful video teaching difficult stuff at the right level, especially for those who understand basic school physics but they don't have the right background for specialization and research at theoretical physics!
Sir , Best video i have ever seen about these black holes and stuff I did not understand this concept when i read about this in a book H.C VERMA.But u explained it very clearly..Thank u sir once again
Thank you so much your explanation were as clear as day ,and I hope that everyone reading this a very enjoyable pun(I asked my friend why he likes reading books about black holes. he said “because they are timeless”.)
Absolutely love what you're doing Dr Physics, you speak nice and clearly. We only arrive at the correct answer when both sides are equal, a lesson from maths that can be applied to many aspects of life hehe.
My full title is Dr Robert Eagle CBE BSc PhD. I studied at Kings College London, BSc Physics and PhD Nuclear Physics. And if I can do it, then so can you. All good wishes for your continuing studies and for the future.
Thank you teacher
I would like to teach me more
When did you complete your BSc and PhD? And what was the topic of your Phd thesis if you don't mind me asking? Not that you'll respond but I'll be grateful if you do as I'm quite curious
How do you get away with this shit?
Where the fuck do you get this "gravitational constant" from?
Not Cavendish for fucks sake?
That the best you can do?
Watching your videos legit makes me want to go back to university to study physics.
The world's best physics teacher right here!
Vegan Wolf i guess hawking tells him everything
100% accurate!!
I agree
Osuperb lecture made clear and understandable
Learned from feynmann
Now we need an advanced video about black holes.
Yes please!!
Azathoth Yes!
ya boi scarce here Jn
Azathoth For advanced lecture, watch Leonard Susskind.
Your videos are simply amazing. I have nothing to do with this type of physics, I'm a petroleum engineer (so more like fluid dynamics and things), but I am very interested in relativity and quantum and particle physics. It all comes from my love to cosmology and craving for answers. I feel my life is wasted.
Started studying systematically on my own and bumped into your videos. Fell in love immediately. You explain so well. Keep up the good work!
Thinking about changing career, despite I like petroleum eng. I couldn't financially support one more degree at 25, but have been thinking about astrophotography.
Thanks
Best of luck!
Don’t waste your life 🧑🏼🚀
Just finished my A-level physics exams, your videos were a great help, thanks a lot !
Calboyoo Thanks. I hope you get the results you need.
DrPhysicsA Why when I read about Hawkings radiation I only find that positive particles escape, couldn't it be balanced by the opposite, negative particles escaping and the black hole gaining mass ?
+John Snow actually when the antiparticle - particle pairs create up in the vaccum of space then somehow the antimatter get some negative kind of energy its not negative i mean its sign is negative as we know that if the force is negative this means its attractive. Maybe like this the antimatter falls not the particle. But again one question again arise why the antimatter only gets negative kind of energy not the matter in this case i also. Dont know.
THE BEST IN THE WORLD....YOU ARE MY INSPIRATION❤️
every time I have a doubt in physics and I see you have a video on that topic I suddenly have a sense of comfort who else agrees?
One of the finest teachers of physics.You are good Doc.
Simply AWESOME! I've been looking for an explanation to Bekenstein formula for MONTHS, in order to understand the Holographic Principle. THANKS A LOT, you made it so simple, you are amazing. Greetings from Argentina! :D :D
I love the way that you simplify this information, so that anyone with a basic understanding of Algebra can understand, what otherwise, seems so complicated. I honestly feel like watching your videos has raised my IQ! Ty so much!!!
Many thanks. Kind of you to say so.
The Alice and Bob example was greeeeeeaaat!!! Congratulations.
Best teacher to explain cosmology
I actually prepared myself a cup of tea before watching the video, wouldn't you know.
+TheBlundert4ker A bloody teacup didn't last, and so by the time video ended, i drank the entire teapot.
I read the following comment about Stephen Hawkings passing in a muslim community:
"SubhanAllah ... Alhamdulillah ... I am elated for Utz Abdul Rahman to give his khutbah on Steven Hawking. He was the frightening figure to me but who was an examplary figure to my husband. I used to hear about him for many years during our married years. When someone whom you are married to admitted that he is an Atheist the whole world that I used to know seemed lost & crumbled. I have to battle with this mountain of a man bringing up my two children alone as a Muslim in a predominantly a non-Muslim country. Even writing this brought tears of sadness to the forefront ... how I struggled through with my life and Alhamdulillah I made good choices and considered myself to be successful in Islam. Even as recently as last year my two sons said, Must be tough for you mum to bring us up but we love you Mum!!! " 😢💞 Alhamdulillah ... I am so glad that Steven Hawking is dead! May Allah Protect All Muslims not to stray from the straight path to the hereafter ... Aameen Ya Rabb JazakAllahu Khairan Kathira Utz Abdul Rahman I heard two days ago that a sister has been murdered and Islamoebia is on the increase in United Kingdom... MaasyaAllah."
What's your take on this?
Ehhh i drank 2 glass black coffe lol
AFTER SEEING THIS,YOU MUST DRINK FULL POT OF TEA!!!!
me too
This is amazing! So interesting. Gave me a break from studying quantum mechanics which is blowing my mind.
Decided that a bucket list accomplishment of mine will be to understand the math of black holes, so here I am.
I always taught Black hole mathematics could only be understood by a prodigy. You simplified iT so even highschool students can understand. Thank you Robert
best description on black holes I've ever heard and beats everything I've read about them so far! Thank you for taking the time to go into this as throughly as you did here!
I just wanted to thank you for your great lecture. I really just clicked on your clip just to see what the clip is about and I found myself listening to your entire lecture. You truly explained the theories in a very interesting and simple way!
Thank you! Can't wait to see the other clips!
I couldn’t understand this with out knowing general relativity. So lucky this guy has great videos on litterally everything.
The best explanation of black holes ever
wonderful explanation... thank you..
This is extremly well and simple explained. Thank you
I absolutely love your videos, nothing can replace knowledge, some math, and good old fashioned piece of paper and a pen.
Now this is Oxford English we non natives all learned in school. Understand every single word he says. Very good. A very good teacher anyway.
Sir...this is possibly the best explanation i hv ever seen in my life..the u hv put up the freaking mathematics and the way u hv merged it wid the cosmos,i believe that u truly deserve at least a compliment...keep it up😄
Wait. Is this channel real!?!
I love you, Dr. Physics! Thanks for what you're doing!
This has been by far the best explanation I have ever heard! Thank-you so much!
This has helped me no end with my physics coursework, which is on black holes. Thankyou for this video
best physics vids on youtube!
In celebration of the first image of a black hole, I'm gonna watch this.
I'm yet to see someone explaining such complex subjects with such clarity. Great job!!
I sincerely appreciate the accuracy and detail in each of your videos. You are able to convey a grand amount of pertinent information in very little time. Through conceptual ideas and examples you are able to explain complex theories in physics (and other subjects) very effectively.
I wanted to let you know that your attention to detail and effort does not go unnoticed :)
Thanks a bunch! Merry Xmas!
Just for understanding: So if something falls into a black hole, it increases the mass of the black hole and therefore the schwarzschild radius?
Yes. Unless its associated with the process called Hawking Radiation (in which case it reduces the mass of the black hole).
How would the mass be 'associated with...Hawking Radiation'? What does 'associated mean' in this context?
'Hawking Radiation' is a hypothetical black body radiation based on zero experimental evidence. It has nothing to do with masses falling into 'black holes'.
+DrPhysicsA why the entropy of photon is 1 not any other number and explain me how come the entropy of photon is one?
Hi, I do not hold a degree in science; however, listening to your class was so clear and interesting. Thank you very much.
Now I can guess but as I said years ago you are the best. I feel honoured that once you answered my question some 7-8 years back. Your versatility might have brought you everything that you could have wished for it has lost us you. Best wishes.
I know this is probably one of the many positive comments, but really, you did an incredible job at explaining this. Amazing.
Wait, what's velocity again?
The speed of an object in a given direction
***** Yes. It was my rubbish sense of humour. Sorry.
iM3GTR haha sorry for not catching on!
He had drawn opossite axis (distance and time) that's why slope had become opossite and small slope Will attain high velocity!
@@1945joshuaruiz smh
I found one of these down the end of my back yard. I came online to try and learn more about them. I kept throwing the garden clippings and raked leaves in it for the last few weeks, will that be a problem? Does anyone know how to get rid of one? I've lost two cats to it and three cricket balls. It's starting to become a bit of a pain in the arse. I think maybe it was my neighbor; finally had one too many McFat burgers and imploded into a singularity.
Bob Eagles: what a phenomenon! Who else could explain complex physics with a felt tip pen and a roll of paper? Quite extraordinary. Thanks Bob.
Hey Doc, these videos are fantastic and I love the contributions you've made to the community.
DrPhysicsA - In the Alice and Bob explanation, you kind of tricked us there.
In the example, Bob always sees Alice as slowly approaching a point, but Alice has no problem in seeing Bob, i.e. The Accelerating person has a perception of the constant velocity person as getting slower.
When you moved towards the Black Hole counterpart, you reversed it by saying that the person who is observing from outside sees the person in the Spaceship getting slower and slower. Shouldn't it be the opposite? Shouldn't the person in the spaceship (like Bob) see the outside observer (like Alice) getting slower as the spaceship approaches the Black Hole, but the outside observer has no problem in seeing the Spaceship enter the Black hole and eventually get destroyed?
Isn't it?
Yeah he got that wrong
Mudit Sinha no, he got that right bc the gravitation makes bob (spaceship) to increase his speed by pulling him towards the center of the black hole, so his speed is increasing so it's like the diagram he showed us before
what is that point Alice (from Bob's perspective never) crosses, and after which she is not visible to Bob? What is that crossing? It seems totally irrelevant. What is it?
I'm still confused :( first Bob is fast and sees the slow person go slower .. then Bob is fast near the black hole but the slow person sees bob get slower :(
@@yugojyotimuna2383 and Mudit Sinha : Yes, the analogy with Alice and Bob cannot be made directly to the Black Hole scenario, because the the presence of the BH distorts space-time. i.e. the Euclidean / rectangular co-ordinate grid of Alice-Bob cannot be used. A Penrose diagram is used instead. See : th-cam.com/video/mht-1c4wc0Q/w-d-xo.html for a lay introduction. But, it is still true that Time for the victim accelerating towards the BH moves slower and slower RELATIVE to the observer's Time. In effect, the observer never sees the victim cross the Schwarschild radius / Event Horizon.
A delightfully clear and fascinating video as always, DrPhysicsA never disappoints ^_^ Just out of curiosity, do you think it could be theoretically possible to some day work out so clever a formula that the infinities would cease to be a problem and we could obtain more detailed information?
I ask at least partially because I am vaguely aware that similar issues occur when trying to reconcile relativity and quantum mechanics, and wouldn't be too terribly disappointed if such problems were solved within our lifetimes. Please forgive any obvious face-palm worthy facts I may have overlooked, I'm just watching these videos out of curiosity after a month or two out of the game.
pupil; metaphore .. steven hawkings and the end of Alien 4 .. And I write that with due respect to Steven Hawking .. In his mind .. the escaping particles are thoughts .. how we speak with our eyes ..
Phillip, Charles Ashwood-Cann
It's "Stephen Hawking", and science fiction films have nothing to do with him.
Escaping particles are not thoughts, my friend. Where are you getting this ridiculous information?
Prince Istalri There are some coordinate systems and other geometries that allow for infinite to be conceptualized, however I suspect that they do not fit the paradigm that you are looking for. Hyperbolic function are drawn on a circular graph, the boundaries of which are representative of infinity. A curved line on a hyperbolic graph, is actually a line in cartesian 2-space and is made to intersect the boundary at a right angle, meaning that it tends to infinity. Although this allows infinity to be placed at a distinct point in space, the scaling on the line becomes gradually smaller approaching zero as the limiting value as the visual distance away from the boundary also approaches zero. This does still leave a problem with infinitesimal values but the point, after the dilated discussion, is that infinity may be beyond our conceptual boundary, but it can still be talked about and, to a greater or lesser degree, be understood! :)
obiwan042
Thanks ^_^ Infinity is intriguing, but seems to be one of those things that "breaks math", so to speak. The best we can do is sneak up on it using limits or infinitesimals; it's nature in certain scenarios can be discerned with these techniques, but you can't actually get to it and directly work with it, which is something I've always found oddly fascinating. Perhaps the next Euler or Gauss will be able to formulate a way to work with infinity, but for now, I guess we just have to deal with the limited understanding of it we can obtain.
Prince Istalri wtf breaks math? What exactly are you talking about?
Very well explained and written and calculated! Many thanks. It always helps to digest the information by writing it down in (as) simple physics as possible!
Fantastic video!! Thank you do much for creating these; I'm sure it's very time-consuming, and you can see a lot of work goes into them, so it's truly great of you to do it :)
"As long as you're here, you musn't be there" XD
You're talking about advanced concepts, but you're making what we MIT graduates consider freshman-level mistakes:
1. Confusing definite and indefinite integrals;
2. Using formulas outside the ranges in which these formulas are valid; and
3. Confusing arbitrary choices of scale with real physical phenomena.
Your reasoning then elaborates these errors into absurdity, which you don't recognize because black holes really are weird.
The force of earth's gravity decreases inside the earth, falling to zero at the earth's center. The formula for gravity isn't valid for r less than the radius of the earth. Potential energy from earth's gravity is only zero at the center of the earth; it's positive everywhere else and has a finite, positive maxium at infinity. (A light-year is close enough to infinity to be infinity for almost all practical purposes.) The gravitational potential energy of a mass on the surface of the earth is something large and positive, maybe over half of its potential energy at infinity. The formula for the sun's gravity is invalid for values of r less than the radius of the sun. You take formulas that are only valid for r values greater than thousands of miles and then draw conclusions from them as r goes to zero. That's nonsense. If the truth is more complicated then talk to a real physicist and make things more complicated.
Your errors make me not trust anything you say
Not only that, but his transition from the graphic explanation of Alice and Bob to the point about black holes doesn't make sense.
If you take up the graph, the light from Bob does reach Alice. So it would mean that Alice can see Bob crashing into the black hole. But she doesn't, because the physical properties of the black hole doesn't let light travel out of the swartzschild radius. The graph doesn't illustrate the point at 40:20 at all, it serves no purpose in this video.
After trying to demonstrate it myself to friends, I realized that the point made with the graphs doesn't make any sense when talking about someone who entered the radius of a black hole. I'm quite disappointed...
The reason you got hyped sometimes while briefing, I couldn't escape your video.
Thank you for this invaluable information. I need to re-watch this to really pound it into my brain. I'm not going to school to be a physicist but physics itself has always fascinated me and I've taken the red pill ever since grade school.
*Gripping teacher, top tier.*
Thank you for this concise, clear explanation of black holes; you managed to first introduce new concepts and THEN apply it to the physics of a black hole, which helped me understand those processes.
Wonderful video!
Makes concepts easy to follow. Better than many so-called intellectuals.
Very fun and precise lecture! Thanks for the vid and keep up the great work!
Thank you dr Physics, for your neat explanation and for introducing me to dr. Susskind whose whimsical teaching is so complementary to yours
Man you are good! I watched the first 18mins and I understand singularity! And I even dont know my tables anymore :) Great lesson!
I genuinely wish I had the intelligence and skill to come to these conclusions myself. I know the general rules behind Black Holes but to see the math representing it explained makes me genuinely want to get in this field. I'm glad I discovered your channel and not only did I subscribe but now I'm making a genuine effort to get better at math.
I must say you seem to be a natural at teaching! I can't thank you enough!
Great content, Very intuitive and easy to follow. Thank you for your effort.
What a simple consise logical approach to a complex concept. Well done.
@DrPhysicsA If a negative/positive energy pair can be created and the negative energy particle fall in while the positive energy particle escapes, why doesn't the reverse happen and completely balance out the process? Why don't we see negative energy particles being radiated from black holes?
this video is really good because you explain it so well anybody can understand, hope there were more teachers like you
You're such a genius. Thank's a lot for all your videos; I have only seen a few but they're fantastic
Thanks for the lessons and work please continue.
Your lectures are absolutely GREAT! Thank you!
Very interesting. Thanks for this lesson!
I like how he doesn't even bother to put multiplication signs🤣 just like any real physicist will do .no tume for stupid signs just straight to the point.
Awesome video actually i learned how we can squish earth to under 2cm to make it blackhole in my 11th grade physics class...
U r videos are pure gems...keep up the great work.
Very clear introduction! Great work!
A fantastic video.
I like the way you work through numerical examples.
Amazing simplification of a rather cumbersome subject, congrats!
You are an absolutely amazing human being for sharing this with the world
A very good video that explains the basic concepts and maths behind those concepts, of black holes, it has given me a better insight into other videos and information on the subject. very much worth watching if you want a bit more information about black holes without need a degree on the subject to understand it. Many thanks for making and uploading it free to view!
This is what we pay tuition for and you gave it to us for free. Thanks for what you do. We appreciate your time.
extraordinary demonstration! great teacher! congratulation! thank you !!!!
Simply a wonderful video teaching difficult stuff at the right level, especially for those who understand basic school physics but they don't have the right background for specialization and research at theoretical physics!
You are an amazing educator. Thank you for your videos.
BRAVO! bravo! very, very well explained with such degree and elegance!
I am so happy I found this channel. Thank you!
THANKS A LOT. This is wonderful explanation of what a black hole is.
you made me love with physics(cosmology). Thanx..
Thanks a lot for taking the time of making this videos, they are very interesting and helpful.
Great lectures! Glued me to my chair for whole night.Thank you very much.
Wonderful!!!,that really expand my knowledge about black holes...
Wonderful. ..explanation from basic to high level
sir, you r the best teacher i ever attended, simply ur explanation is wonderful, after watching your video im fascinated in physics .
Outstanding explanation of multiple topics.
Awesome Lecture , I thoroughly enjoyed every part of it ! Cheers :)
Just finished the whole thing, great video!
Beautiful explanation...thank you Dr. Physics
Thank you for this wonderful explanation.
Great explanations, thanks for the information
Great videos my friend, you are a natural teacher
wonderfull and simplicist explanations...thnx for understanding
you are explaining it perfectly...thank you very much ... you are very talented in explaining things very simple...
Sir , Best video i have ever seen about these black holes and stuff
I did not understand this concept when i read about this in a book H.C VERMA.But u explained it very clearly..Thank u sir once again
Thank you so much your explanation were as clear as day ,and I hope that everyone reading this a very enjoyable pun(I asked my friend why he likes reading books about black holes.
he said “because they are timeless”.)
Wow! Thank you so very much for this!
Bravo! Well done.
This is terrific 💡
you have an extraordinary talent for teaching. very impressive.
Absolutely love what you're doing Dr Physics, you speak nice and clearly.
We only arrive at the correct answer when both sides are equal, a lesson from maths that can be applied to many aspects of life hehe.
I couldn't understand it all. But thanks for uploading. Once again i met the beauty of Math .