101–110 of 153 posts
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Nobels are not awarded posthumously, and he died in WWI. On that subject, “Einstein’s War” is an interesting read on the interplay between WWI and the development of general relativity.
What a supreme loss to physics.
I'll see myself out.
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Not necessarily, a supermassive black hole can have quite bearable gravity at the event horizon (as the event horizon radius depends linearly on the mass and the gravity declines quadratically with distance). You still wouldn't be able to communicate your experiences though.
What is supposed to happen with different types of chemical bonds? If half of a molecule is inside a black hole and half is outside, the half inside is necessarily constrained to the black hole, while a molecule outside does not have such constraint. The chemical bonds should be also necessarily broken at least for a moment, since an atom inside black hole can not exert electromagnetic effects on an atom outside blac…
There is a classic analogy of light traveling through space-time being like ants crawling on a balloon. A black hole is a spot where the balloon is being sucked in. Faster and faster as you get closer. The event horizon is where the speed at which the balloon moves matches the speed of the ant. There is nothing special from the ant's immediate perception about this line, but if the ant crosses, it is doomed.
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An illustration in the press release contains this phrase: "When a massive star collapses under its own gravity, it forms a black hole that is so heavy that it captures everything that passes its event horizon. Not even light can escape. At the event horizon, time replaces space and points only forward. The flow of time carries everything towards a singularity furthest inside the black hole, where density is infinite…
Non poetic but hopefully bit more understandable explanation of what it tries to say: After crossing the event horizon the radial direction becomes like time. And what used to be time becomes like space. What this means that you will inevitably travel to the center, just in the same way as you travel into the future in normal life. Inside the event horizon the center is not at any place that you can see, instead it i…
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I somehow always had the impression that Roger Penrose was a numerical computation guy (Moore-Penrose pseudoinverse). I did not realize he had this vast of scope of a contributions in physics. Certainly quite impressive.
He has also written a few books. https://www.amazon.com/Roger-Penrose/e/B000AQ045A%3Fref=dbs_...
It looks like Hawking missed the Nobel prize by two years then. This is almost the same like with Fischer Black.
Stephen Hawking : I understand you're struggling with professional jealousy.
Sheldon Cooper : Thanks, Leonard, now he's not going to think I'm cool.
Stephen Hawking : Don't worry. I know how you feel. I have never won a Nobel prize.
Penny : Oh, wow, that doesn't seem fair.
Stephen Hawking : It's fine. I've been on The Simpsons.
Sheldon Cooper : How do you deal with the success of your colleagues?
Stephen Hawking : I remind myself every scientific advancement is a victory. Also, I was on Star Trek.
The first meeting between Hawking and Cooper was pretty funny. Hawking couldn't make very much in the way of facial expressions, but you could tell he was having a good time [1].
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The radial direction of the inside of the Schwarzschild Black Hole is timelike. This means that; inside the event horizon, the inevitable passage of time becomes the inevitable move towards the singularity at the center of the Black Hole. To answer your question in clear terms: No, you cannot move freely in the radial direction. Only towards the center, in the same way you cannot move freely forward or backwards in t…
Considering a point particle, what constrains it from orbiting [which is what I'm assuming we're meaning here as all matter has to move radially to cross the event horizon]? If it had a tangential component to its momentum prior to meeting the event horizon (EH) wouldn't it continue to orbit past the EH?
Closed orbits are impossible though, all test particles finish at the singularity in a finite amount of proper time.
Earlier quoted context omitted.
An illustration in the press release contains this phrase: "When a massive star collapses under its own gravity, it forms a black hole that is so heavy that it captures everything that passes its event horizon. Not even light can escape. At the event horizon, time replaces space and points only forward. The flow of time carries everything towards a singularity furthest inside the black hole, where density is infinite…
I’m a Physicist (Not Astrophysicist, but still. ) I can assure you that this is also gibberish to me. These kind of popular science translations are like one-way hash functions. If you really understand the science, you can probably recognize where they are coming from. But by themselves they contain 0 information.
Earlier quoted context omitted.
Not necessarily, a supermassive black hole can have quite bearable gravity at the event horizon (as the event horizon radius depends linearly on the mass and the gravity declines quadratically with distance). You still wouldn't be able to communicate your experiences though.
What is supposed to happen with different types of chemical bonds? If half of a molecule is inside a black hole and half is outside, the half inside is necessarily constrained to the black hole, while a molecule outside does not have such constraint. The chemical bonds should be also necessarily broken at least for a moment, since an atom inside black hole can not exert electromagnetic effects on an atom outside blac…
And similar in case of a black hole, you are falling through the event horizon and nothing happens, it is just that calculating what you need to do to escape, you note that it is too late.
To expand a bit on the molecule situation, when one of the atoms is inside the black hole, then parts of its electric field are still outside and influence the other atom. To have the other atom escape to infinity, you would need to break the part of the bond "still outside" and the gravity of the black hole.
Wow, I didn't realize Penrose hadn't won one already. He clearly deserves it!
Nobel prizes reward experimentally verified discoveries and I suspect the direct observation of a black hole is what finally got Penrose his Nobel. But discoveries like Hawking radiation didn't result in a Nobel prize because even though it is a well accepted idea among physicists, it hasn't been observed yet.
As theories predict things that require more and more extreme conditions and precise instruments, the time between theory and experimental validation gets longer and longer.