If light has no mass, why is it affected by gravity? General Relativity Theory

So I am not overweight; I'm just over accelerated.

Every time I watch videos on Newton's theory, I get following questions - 1) As you questioned Newton's theory as why earth do not crash into sun. I can ask the same question with space time concept. 2) You mentioned that person in space is same as person falling on earth. But person falling on earth accelerates and not in space. And we know that we need some force to accelerate. 3) Can light have some infinitesimmally small mass that it bends when travelling around sun?

as another comment pointed out, at 4:37 9.8 m/s^2 is not speed but acceleration. It is also referred to as “g” not “G”. “G” is a gravitational constant which is roughly equal to 6.67×10^−11N⋅m2⋅kg−2

While I have never parachuted, I did once miraculously survive a massive rockslide from a mountaintop, during which I fell considerably more than a hundred feet. As I was falling, the rock ledge I had been walking on seconds before was still beneath my feet, but it did not feel like I was surfing, where you feel the board supporting your weight. Instead, it felt much more like those scenes of astronauts in zero G. Granted, these impressions were entirely subjective and very, very fleeting, with a great deal of sheer terror coloring everything, but I will never forget that "falling feeling" despite seemingly floating just above those many tons of suddenly plummeting rock. While there are doubtless many factors responsible for this sensation, I suspect that my (wildly unstable) frame of reference was chief among them. But the craziest thing about the whole experience was actually the gratitude I felt for the branch upon which I was eventually impaled. It ran straight through the thickest muscle in my thigh and absolutely saved my life, which I just had time to recognize before I passed out from the shock and pain. All of our experience is mediated through our senses...even in our thought experiments.

So the reason light can't escape a black hole, is because space time is bent to infinity.

for some reason it had never occurred to me that the standard demonstration for general relativity is visualized from a 2d perspective until now. all of a sudden it clicked how trippy the 4th dimension is to me. it's still the same curvature of spacetime that you fall into but its all around the object rather than just under it. the 3d interpretations of 4d objects such as tesseracts always seemed really weird and out of place to me but it definitely makes sense now.

I understood these concepts for the first time in my life and need more such kind of videos❤

47 secs into the video I've intuitively learned what I've learned in all of Physics classes videos, and books, thanks

I have actually been pondering this concept myself but now this makes a lot more sense, thank you!

I thought i understood everything all these years until you said "the curved path of light might be the shortest path" that got me into thinking again why the curved light isnt just simply right beside the border of suns circle. Thanks for the explanation. Learned something new honestly.

Thanks for the video! I love the analogies you make throughout the video to clarify the concepts. It's also amazing how Einstein thought it through – not just the concept itself, but he was also able to prove it mathematically. I once listened to a detailed podcast from "The Science of Everything" where the host explained the entire concept with all the math behind it, and I can tell you that Einstein was truly remarkable for what he achieved. 👍👍

I wish I was taught the 3D version when I was young. Nowadays, I find that I understand the 3D space-time curvatures model better than the 2D one. When I started learning GRT, I struggled understanding how space-time is curved by mass with a 2D model as it did not give the accurate picture of space-time curvature. I also wish that modern generations will be taught with 3D models instead of 2D right from when they were kids, as I feel that kids nowadays have a better grasp of 3D models, thanks to ICT technology.

Hey man thanks for the great Vid! But will you actually make the one about special relativity theory as you announced? 🙂

I think I will never understand General Theory of Relativity and Special Theory of Relativity in my life. 😢😢

the best video I have seen on this topic so far. AMAZING. Very well done

This video finally made me understand relativity a bit. Thanks sir

Great animation representations. Keep it up. Good work

Great animation representations. Keep it up. Good work. Very well explained thanks good job .

My friends: Why are you watching such a nerdy video. Me: To prove that the cameraman never dies.

This is one of the best explanation from the many videos i have seen. Thanks