To quote Enrico Fermi: "Having listened to your lecture I am still confused. But on a higher level."

You know it's going to get serious when you're on 7 and the video is only half over

"general relativity is a physics theory created by Albert Einstein" Me: hold on smart guy, take it easy.

2:22 "Oh that isn't too bad" 2:24 "Oh it's actually 10 equations, ok" 2:25 "Oh god oh f*ck"

0:06 : What you study in class 1:53 : What you get for homework 4:30 : The exam

7 levels, in 6 minutes. Less than a minute per level. Truly living up to the name “minutephysics”

3:20 is my favorite part because I love how he lists off the numerous observations that validate the model. It's the observations that make this a physics theory instead of just mathematics.

Trying to explain relativity to me In 7 levels In 6 minute video At 5 in the morning In 4 walled room In 3 dimensional world On 2 dimensional screen And in 1 dimensional BRAIN NICE TRY👍

my two brain cells have been stuck on level 2 since past 5 years

Thanks for recommending Vitamania Henry!

I've been studying this for years. This is by far one of the most accurate videos on the field. Level seven is the strict construction of the equations and their solution throughout classical differential geometry, tensor calculus, complex analysis, linear algebra, ordinary differential equations, partial differential equations and special functions among the classical fields. This is simply a compendium of what this is in its entirety. This is the field of Riemann Manifolds.

It is so confusing that me, my future and past self gathered together yet couldn't understand anything

Level 3: Okay, kinda get the main idea Level 4: ｗｈａｔ

Level -1: falling Apple + head = ouch.

3:42 That's not the black hole at the centre of the Milkyway. It literally says M87 on the picture!

Words cannot express your talent and I'm so grateful. Thank you for all these insights and inspiration. It took me ~1000 hours to produce 17 hours of video explaining Special Relativity in just 3 levels of complexity …

The image of the black hole was not from the center of the Milky Way but rather from data collected observing the galaxy M87.

This is the kind of stuff that originally bothered me about science: that you have to keep coming back to a topic in order to learn the next stage as your level of understanding increased. Now, as a biology teacher, it is one of the things that makes science, and learning in general, fun. "Remember how you learned in middle school that plants make energy from sunlight? Well it's actually more complicated than that." "Remember how you learned in high school that plants make monosaccharides from sunlight? Well it's actually more complicated than that."

This is a brilliant idea! To present such an advanced subject in different levels next to each other, it really makes it easier to follow

Nobody literally nobody: 1st year Physics Undergraduates:I'm gonna unite GR&QM

The time I spent watching pbs spacetime did not goes to waste. I manage to nod at the explanation up to level 3. 🎉🎉🎉

Level 14 of General Relativity: Obtaining a PhD in Theoretical Physics

I have been trying to understand it for a long time and this video put everything that I have found in a correct order and now I finally did understand it. AMAZING

This was SOOOOOO good! Hearing all the explanation after one another really helped me to understand it! It's also kind of funny when you realise that level 1-6 is only the first half of the video XD.

The algorithm has not been kind to your channel, this is the first of your videos that has popped up for me in probably a year.

I'm level 7 for things that I know. I'm level 0 for things that I understand.

I like that you include geodesics, a major step in my learning.

I have just discovered your vids and they are unreal! The fast pace really suits hows racy my minds works its great 😁👍

and here I am trying to pretend that I understand

Having solved the Einstein Field Equations for a physics final in college, fuck. That is all.

Cool concept for a video. I especially enjoyed the "level 1 again" explanation of people's personal experience of gravity on earth in terms of your GR explanation.

Just finished taking general relativity this quarter that passed, and I can honestly say that this is the hardest topic I've seen so far in my physics career, but also the most enjoyable.

Okay, time to change my LinkedIn description to “Physicist specialized in General Relativity”

3:42 The image is of the black hole at the centre of M87, not the Milky Way, hence the picture being labelled M87* instead of Sagittarius A*

Really nice explanation of the equivalence principle and just a nice conceptual summary of GR.

the earth surface analogy was awesome. great work!

Here I am finishing my Master Thesis on a Loop Quantum Gravity topic and trying to write a nice overview of what have brought us this far. This video is so perfect now I want to put the link to it in my thesis instead of writing chapter 1. Great work.

This is the ultimate video to confuse flat-earthers even more :-D

This is a fantastic video, and a very effective and engaging style of presenting it. Bravo!

Level 90: Discovering a mathematical notation that encapsulates both General relativity and Quantum mechanics and winning the nobel prize

3:44 That is NOT "the black hole at the center of the Milky Way" (Sagittarius A*) that is the black hole at the center of galaxy M87. They did consider imaging Sagittarius A*, but that was ultimately not their target. Edit: It turns out I do not know how to spell "Sagittarius."

I am very glad he mentioned that GR is incomplete

05:09 „It is very high-level stuff“ Our math teacher when creating the tests: „Haha what did you say? Pathetic.“

Basic tenets of natural philosophy are; 1. Law of entropy is fundamental law and it is unification of gravotational force, electric force, black-body radiation law, divergence law, law of motion, structure of fundamental elements. 2. General theory of relativity and Quantum mechanics are description of phenomenon without entropy or no loss or perpetual motion. They are same and there is no need of reconcilation of these theories. 3. Phenomenon are in classical domain, general theory of relativity and quantum mechanics are ideal case and thus not observable. Theory of relativity needs many assumptions which are contradictory or unprovable thus false theory. 4. There are no two types of charge like two types of matter which arises when one solve Laplace's equation, field without source but that lacks time component. In nature only force without energy loss is magnetic force. There is electric force but it like thermodynamic pressure eventually die out. 5. Entropy is decaying of force or ceasing motion. Only way to counter entropy is cyclic or periodic motion that negate volume expansion and restore system but introduce temporal component, frequency. More the frequency more the entropy. 6. Without force there is no continue motion, mechanical force is due to heat and electric due to charge. Conservation of energy is not correct but equality of power as it is product of force applied and rate. Both force and rate can increase entropy but in cyclic only rate.

Remember when math and physics had numbers? .... yeah me neither

1:20 that's a nice globe you got there. Me, an intellectual: actually, it's a pseudo-Riemannian manifold with Lorentzian signature,... But thank you! 😊

I love how equivalence principle is added in the subtitles.

This the BEST video I've watched about General Relativity!!

the funny thing is, he's only explaining it for those who already know.

The video hasn’t started yet and I’m already confused.

simple yet complex, great work

This totally helped me understand. Great concept.

So good. I've tried so many times to explain the way the ground pushes you away from a straight line and I've never once passed understanding across. Now I can link to this video with the clear diagram, and maybe in future, I'll succeed in showing the beauty of this idea to others.

Thanks for summing all that up in a short video. I've seen a lot of videos explaining GR/SR on different "levels" and this gives me a nice feel on where I stand in my understanding of the subject.

Danke schön Henry für dieses toll und sehr verständlich erklärtes Video... 👍👍.... Macht so weiter.... 👍

YAAAY do this more please! Great content

👀

Great video. Your videos got me interested in general relativity six years ago, and to this day I’m still trying to become a mathematical physicist so I can study quantum gravity. ❤️

Amazing explanation, thank you.

im new this channel is awesome! lots more ppl would love to learn about physics but we need more stuff like this I feel like when ppl don't think physics r cool it's might b bc they're not getting an explanation that's ez to understand

It's not a question of "when? " my dear Reggie, but "where?"

"very high level stuff" - like nobody has figured out how to do it yet

I went into this video thinking, oh, that's cool, he'll explain it in incrementally more complicated ways so I'll be able to understand it by the end! Me at difficulty 2: huh

You know what the insanely insane (and awesome) part of this video this? THERE'S MORE LEVELS! (For reference, I think I'm at 6.5, or at least between that and level 7. The idea of manifolds and tensors is something I have yet to understand, but I understood the rest of Level 7).

Wow that was very quick but so educational! Thanks so much!

i'm gonna start calling the 90s the "nowdays"

SOOOOOOOOO BEAUTIFUL..! thanks man.. Best explaining ever ♥

I've been a Nebula subscriber for at least a year and I've never seen Minutephysics mentioned on the site under you said to go looking for it.

I have been subscribed to this channel for quite some time now, I initially got interested because of my great physics teacher in high school. Back then I did not understand most of the videos at a deeper level (so the primary target audience). After 3 1/2 years of studying physics, I have my GR exam on monday and can happily say: I knew everything in this video! And it makes me glad to finally be at a point where I do understand this stuff at a deeper level. It took quite some time, but I got there. Of course I am still just beginning to be a physicist and there is MUCH I don't know yet and MUCH and I don't know that I don't know yet. And I am excited and looking forward to finding it out!

This video: There are 7 levels of understanding gravity. Me: I can make it to level three, take it or leave it.

You are so blessed to understand these things.

4:05 I finally understand how gravity works on our planet. Omg. That was the best explanation I’ve ever seen.

M87 is not at the center of the Milky Way! It’s in another galaxy about 50 million lightyears away.

Loved the level 0, something Einstein did 😂😂

This is actually the best summary video I've ever seen on physics.

Wow. This was great. Thank You 🙏

What is General Relativity? Level 0 answer: "posts this youtube link"

Today we have a Rover landing and minute physics uploaded, blessed day

Wow! This is great. Thank you!

Thank you for described level by level.

4:02 what a great explanation of gravity!:)

Videos like this remind me of why I love physics.

As a physics major heading into my sophomore year, the feeling I get watching this video is roughly akin to the feeling I get at the top of the first hill on a roller coaster as I stare down the straight-vertical track…

I love your videos! Please communicate to nebula creators that we NEED to be able to play videos at 2+x speed. I would spend so much more time there if I wasn't able to watch twice as much here in the same time.

4:48 'Nowadays' ends at 1997, wonder when the next breakthrough will b e

I'm at an approximate 2.5, if I had to quantify it, and when I talk about this to people in lower levels, they feel like I'm a genius, even tho I tell them I basically know nothing. It's wild how the depth of knowledge is so overwhelming that even a slight amount of it can make you look way smarter than you actually are to people who just used their time learning other things.

Awesome approach!

beautiful explanation

Riemannian manifolds are on the syllabus for my differential geometry course, so hopefully I gain a better appreciation for this video in three months

Isn’t the black hole image from M87?

yeah.. this is something I definitely have to research more for a better understanding

This is great. Thank you

This is amazing. I love seeing high level knowledge explained quick. I’ve had this idea for a while about predicting the future with all the variables of today. Ultimately it comes back the is anything actually random and to that quantum mechanics says yes

the best gr guide on KZfaq

1. We have the o1 frame, with the observer standing in the center/origin of the train1 2. We have the o2 frame, with the observer standing in the center/origin of the train2 3. We have the o3 frame or rest frame, with the observer standing in the center/origin and where both o1 and o2 are moving in opposite directions with speed v 4. In each of the 3 frames, at t=0 , o1, o2 and o3 are crossing past each other 5. Train1 has front1 and tail1. Train2 has front2 and tail2 6. There are various points in the rest frame opposite front1, front2, tail1 and tail2 at t=0 7. Light from o1 and o2 will reach their respective front and tail at E2train1, E2train2, E3train1 and E3train2 8. The distances in the rest frame will be the same to E2train1 and E2train2 as will the distances in the rest frame to E3train1 and E3train2 9. The times in frame1 that E2train1 and E3train1 occur will be the same 10. The times in frame2 that E2train2 and E3train2 occur will be the same 11. The times in the rest frame that E2train1 and E2train2 occur will be the same 12. The times in the rest frame that E3train1 and E3train2 occur will be the same 13. Although there is a relative velocity between o1 and o2 as seen from o3 there are no differences in distance (8) or time (11, 12) to the events E2train1 and E2train2, E3train1 and E3train2 as seen from the rest frame 14. If m1 is the mass of train1 and m2 is the mass of train2 and are equal then m1=m2 15. The rest frame can be considered to be the same as a center-of-mass (COM) frame 16. If force F is applied to m1 in frame1 and force F is applied to m2 in frame2, the accelerations of m1 and m2 in the rest frame will be identical 17. In the rest frame, the clocks in frame1 and frame2 tick at the same rate. 18. Spacetime of E1 is ({d, +ve}, t) in frame1 and the spacetime of E2 is ({d, -ve}, t) in frame2. 19. Spacetime of E1 is ({d, +ve}, t) and the spacetime of E2 is ({d, -ve}, t), both in the rest frame 20. E2train1 and E3train1, E2train2 and E3train2 are examples of the paired events, E1 and E2, discussed above

Thanks for the video.

Getting to level 5: "Oh Jesus".

I like that Einstein's equation where c = 1 and G = 1

I love the jazz music stops vibe given by having jazz music literally stopping

I thought ill lose on level 5 or more because u started using more completed words and speak faster (+more things to recall from my mind). But despite all that i managed to get to the end! Great video, very balanced (for me)