3 ms·

Searching for small primordial black holes in planets, asteroids, here on Earth

10 points by rntn 2y ago

westurner 2y ago
https://news.ycombinator.com/item?id=42347561 https://news.ycombinator.com/item?id=42347561 (1 point) Maybe the gravity hole in the Indian Ocean is due to a primordial black hole
- aradox66 2y ago
  A black hole would orbit the center of the earth, it wouldn't be lodged in place somewhere
  - westurner 2y ago
    /? What happens if a black hole hits Earth? https://www.google.com/search?q=What+Happens+If+A+Black+Hole+Hits+Earth%3F https://www.google.com/search?q=What+Happens+If+A+Black+Hole... Though, the same folks claim there could be a microscopic black hole every 30 km on or throughout earth https://news.ycombinator.com/item?id=38452488 https://news.ycombinator.com/item?id=38452488 : > PBS Spacetime estimates that there are naturally occurring microscopic black holes every 30 km on Earth. https://news.ycombinator.com/item?id=33483002 https://news.ycombinator.com/item?id=33483002 > [...] > Isn't there a potential for net relative displacement and so thus couldn't (microscopic) black holes be a space drive?
AtlasBarfed 2y ago
Someone needs to explain to me how a primordial black hole in a neutron star doesn't implode into a full black hole in seconds. Correct me if I'm wrong but a neutron star is basically a huge atomic nucleus. How would any primordial bh not immediately start sucking on mass at extreme speed? Is it because the event horizon is that small? Anyway I would think the persistent survival of neutron stars would basically invalidate the existence of swarms of black holes. Neutron stars are some form of superfluidity. Do black holes lose momentum if they suck in matter moving more slowly than them? They must. So some high speed primordial black hole would slow down and suck in matter rapidly. You'd think the hole would suck in mass until the point the neuron star partially unbinds.
- gus_massa 2y ago
  The interior of a neutron star is not "solid". You can imagine it's made of a lot of small balls that are the neutrons and some protons [1]. They are small in comparison, so from a small black hole point of view it's like fog. Black holes don't suck like a vacuum cleaner, it's they only absorb what it colide with them. Imagine the black hole is a very sticky point in a pin, and you move it inside fog. It woulg take a lot of time to collect all the fog. [1] There is a people researching about the internal structure of a neutron star. In spite of the funny names, I swear this is serious research: https://en.wikipedia.org/wiki/Nuclear_pasta https://en.wikipedia.org/wiki/Nuclear_pasta https://astrobites.org/2017/10/05/nuclear-pasta-in-neutron-stars/ https://astrobites.org/2017/10/05/nuclear-pasta-in-neutron-s...

10 points by rntn 2y ago

https://news.ycombinator.com/item?id=42347561 https://news.ycombinator.com/item?id=42347561 (1 point) Maybe the gravity hole in the Indian Ocean is due to a primordial black hole

aradox66 2y ago
A black hole would orbit the center of the earth, it wouldn't be lodged in place somewhere
- westurner 2y ago
  /? What happens if a black hole hits Earth? https://www.google.com/search?q=What+Happens+If+A+Black+Hole+Hits+Earth%3F https://www.google.com/search?q=What+Happens+If+A+Black+Hole... Though, the same folks claim there could be a microscopic black hole every 30 km on or throughout earth https://news.ycombinator.com/item?id=38452488 https://news.ycombinator.com/item?id=38452488 : > PBS Spacetime estimates that there are naturally occurring microscopic black holes every 30 km on Earth. https://news.ycombinator.com/item?id=33483002 https://news.ycombinator.com/item?id=33483002 > [...] > Isn't there a potential for net relative displacement and so thus couldn't (microscopic) black holes be a space drive?

AtlasBarfed 2y ago

Someone needs to explain to me how a primordial black hole in a neutron star doesn't implode into a full black hole in seconds. Correct me if I'm wrong but a neutron star is basically a huge atomic nucleus. How would any primordial bh not immediately start sucking on mass at extreme speed? Is it because the event horizon is that small? Anyway I would think the persistent survival of neutron stars would basically invalidate the existence of swarms of black holes. Neutron stars are some form of superfluidity. Do black holes lose momentum if they suck in matter moving more slowly than them? They must. So some high speed primordial black hole would slow down and suck in matter rapidly. You'd think the hole would suck in mass until the point the neuron star partially unbinds.

gus_massa 2y ago
The interior of a neutron star is not "solid". You can imagine it's made of a lot of small balls that are the neutrons and some protons [1]. They are small in comparison, so from a small black hole point of view it's like fog. Black holes don't suck like a vacuum cleaner, it's they only absorb what it colide with them. Imagine the black hole is a very sticky point in a pin, and you move it inside fog. It woulg take a lot of time to collect all the fog. [1] There is a people researching about the internal structure of a neutron star. In spite of the funny names, I swear this is serious research: https://en.wikipedia.org/wiki/Nuclear_pasta https://en.wikipedia.org/wiki/Nuclear_pasta https://astrobites.org/2017/10/05/nuclear-pasta-in-neutron-stars/ https://astrobites.org/2017/10/05/nuclear-pasta-in-neutron-s...