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That is very interesting and made me realize I did think of black holes as “sucking” things in. Which I see is not the right way to think about it.
by nonethewiser 2y ago
That is very interesting and made me realize I did think of black holes as “sucking” things in. Which I see is not the right way to think about it.
- api 2y agoIt’s an object with theoretical maximum density. That’s one way to think about it. Another visualization: if you had an Earth mass black hole with a solid shell surrounding it at the same radius as the Earth’s surface is from its core, gravity atop that shell would be 1g. The actual black hole would be about the size of a marble. If you got close to it you would of course be subject to insane gravity and be “spaghettified” etc. All the mass would be in that marble. But at a distance it would be the same. Compared to that object the Earth is mostly empty space. Ordinary matter is not that dense. Black holes are totally fascinating. They are in some ways the most extreme objects that can possibly exist. If we could study one we could learn a lot.
- philipov 2y agoThat's Newton's Shell Theorem for you.
- baxtr 2y agoI love HN for these kind of comments
- XorNot 2y agoThey're also interestingly one of the most boring: every black hole can be described by 3 numbers: mass, spin and charge. Which is to say they are extremely high entropy.
- api 2y agoThey are extremely high entropy as far as what's accessible. We don't know what's really on the inside.