Why can't Light Escape a Black Hole? 🤔 w/Physicist Brian Cox

Why can't light escape a Black Hole? Why does light bend around a black hole? Why can't light which has not mass escapes a Black Hole?

Join Physicist Brian Cox as he answers one of the most interesting astrophysics questions asked to him. The interviewer asks: "Since gravity pulls things into a Black Hole, why can't light being mass less particles escape a Black Hole?" In response to the question, Brian Cox starts by explaining the theory of Gravity proposed by Isaac Newton and Einstein. He adds how Newton's theory of Gravity suggests that Gravity pulls objects inward, whereas Einstein's theory of Gravity, which is a more refined version suggests that if you imagine a universe, you can imagine space and time often called as the "fabric of the universe". Professor Brian Cox then gives an example of how you can place a cannonball on the fabric of the universe, and it curves the surrounding area. At the end of this #shorts he talks about how things that go inside a Black Hole will curve in space and time rather than simply going inside it. So, that's what happens with particles of light or photons when they get curved around a Black Hole.

#blackhole #hawkingradiation #briancox #singularity #science #podcast #cosmology

[SleepyScienceDocs]

So basically since light travels along this “fabric” of the universe, and since the “fabric” is curved or bend to a “supposed” singularity inside the black hole, the light keeps going down that “bend” in the “fabric” and is not coming back out because the “bend” in the space “fabric” is supposedly infinite. So the light is still travelling, but it is travelling along the infinitely “bended” space inside the black hole. Fascinating

[bommtatak]

Cillian Murphy could pull of his character as well. They look like brothers

[PeterDB]

TL;DR:
Gravity doesn't "pull" anything, it isn't a pulling force, it simply bends the spacetime, so light still travels "straight" through space, but that space is bent, and in the case of the black hole, it's bent so far into itself that past the event horizon the only direction you can face is at the black hole, so light can't shine "away" from it.

[lukechappuis]

I remember one of my teachers in high school talking about Einstein's theory. When I imagined space and time as a fabric, I believed anything could be possible. That was a life changing experience. Thank you, Einstein and physics.❤

[niklastorshagen]

I could listen to Brian Cox all day, I can't say the same for Neil Degrasse Tyson

[collinsey]

I could listen to this guy all day mahn 😂

[IPowder]

Light is moving in a straight line all the time
It's the space that curves instead

[ASFALT]

Newton forever catching strays just because he dared to think outside the box 😂

[DavidMartinez-kfzt]

He's so polite in telling people they're wrong

[emt]

"Einstein's is better"
"Now, imagine"

[think]

The more correct way to say this is: WHEN it comes to massive objects, then this phenomenon appears as what we call "gravity, " which is a force between two massive objects, dependent on their mass and inversely dependent on the square of their distance.

In general, ALL forces are just higher-level constructs for underlying physics. That's true for ALL of the forces. So to demote the "force of gravity" from its position is unnecessary. The "centrifugal force" for instance has underlying physics. It's not considered a "fundamental" force--which, by the way, are almost certainly also not fundamental, but I digress. It's really a composite force resulting from some deep physics at the molecular level, holding a body together that is spinning. But it's a "force" in the sense that it causes acceleration on massive objects.

The Newtonian law of gravity doesn't stop being right. It's just now we've EXPANDED the underlying phenomenon to work MASSLESS objects ALSO. It just doesn't work out like the previous law, is all. Instead of F=ma, we need other equations to describe the motion of massless objects through spacetime.

It's a lot like how the Earth is a sphere, but because it's so large, for all intents and purposes in local areas, we can treat it as flat. Or like how once you reach the max focal length in the lens of a camera, all distant planes are equally in focus, more or less.

It's an approximation, in other words, that is so good in a specific range of cases as to be useful. But it has an expanded underlying set of phenomena that give rise to even more stuff.

[TheSleepSteward]

The really cool part is that Newton and Einstein's theories are both the exact same thing. They describe the same thing. It's just one works on a much smaller scale and the other works on a larger scale but they're describing the exact same phenomena. How cool is that?

[Swamky]

Spinning fasterer and fasterer and fasterer 😂

[sharcodile]

It’s kinda like when you shine a light on a flat paper, you just have a ball of light on the paper, then you slowly put it on its side, the light will stretch on that paper more and more, getting longer and thinner, until it’s on its side, and both sides are almost completely covered by light

[mat]

His eye sockets look super close together. Get this man an I.q test 😆 🤣

[masterchief]

Yes but that curve is on all sides of that object not flat and 2 dimentional

[artigeeks]

Gravity bends space and then where light follows the bend created, therfore the light is still travelling in a straight line through curved space.

[shaunr]

I was always confused about this and then i saw an explanation similar to this that moment of clarity quite astounding

[RazgyMicYt]

I just came back from his show " A 21st Space Odyssey " it was so fascinating and interesting, I love this guy I was so happy I was able to meet him and see him there and listen to him in person it was incredible, I live in Romania and he came for the first time in Bucharest 👍

[penguinista]

That analogy always tripped me out because it uses gravity in 3D space on a 2D model to simulate the effect mass has on 4D spacetime. But in our 3D experience we perceive that effect as gravity.