I was a black hole analog built out of Bose-Einstein-Condensate.
Considering they used sound instead of light, wouldn't that make it a silent hole?
this post was submitted on 27 Feb 2025
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pokes black hole C’mon, devour Earth.
It's wild that there is so much space between atoms (and inside them, between the elctron orbitals and the nucleus), and black holes are so incredibly dense, that a small black hole can fall all the way through the Earth and not hit enough matter to gain appreciable mass.
Don't buy lab-grown black holes, it's not quite the same if it's not mined by a child in South Africa. And it should cost at least three times your salary, otherwise your spouse will be ashamed.
It's only a black hole if it comes from the black region of space. Otherwise it's just a sparkling dense mass.
A not-sparkling stellar mass
Not everyone can cough up the cash for some free-range organic black hole.
If I read this post without any context I would think "this guy is too poor to hire a black prostitute" and not " this guy doesn't have a particle accelerator capable of making a miniature black hole"
And this is why you should not skip your physics classes.
Maybe not the actual referenced article, but its close:
https://www.livescience.com/black-hole-analog-confirms-hawking.html
While the study was testing for a specific kind of energy radiated by an artificial micro black hole...
What's being glossed over is the broad concept and implications of Hawking Radiation.
https://en.m.wikipedia.org/wiki/Hawking_radiation
Simply put, a tiny micro black hole will evaporate itself out of existence quite rapidly.
There is no danger of such a thing growing and consuming everything like an expanding katamari damacy ball.
There is no danger of such a thing growing and consuming everything like an expanding katamari damacy ball.
Damn.
What is the minimum size until it will grow faster than it evaporates? And can we make one if we try really hard?
https://www.vttoth.com/CMS/physics-notes/311-hawking-radiation-calculator
Indeed, any black hole with a mass greater than about 0.75% of the Earth's mass is colder than the cosmic background, and thus its mass increases for now. As the universe expands and cools, however, eventually the black hole may begin to lose mass-energy through Hawking radiation.
Size isn't actually the main factor, mass is.
A teaspoon of what neutron stars are made of weighs as much as Mt. Everest.
Its the mass thats important, and apparently the threshold for an actually stable black hole is 0.75% the mass of Earth, 4.48 x 10²² kg .... or, roughly 2/3 the mass of the Moon.
(The Moon's mass is roughly 1/81th that of Earth's. It ks far, far less dense.)
So... basically 0 chance in our natural life times we'll figure out how to convert the Moon into a blackhole, lol.
EDIT:
There... could theoretically be a wandering black hole of aporoximately that mass... but even if it entered our solar system, chances are it would just get thrown out, deflected by Jupiter and the Sun, and it would only maybe eat some ice in the Kuiper belt, dust and maybe very small asteroids in the asteroid belt if it somehow made it past Jupiter.
Black holes don't have infinite gravitational vaccuum power that extends infinitely, because they do not have infinite mass.
if they did, the occurence of one would instantly eat the entire universe at the speed of gravity, which is the speed of light.
They have as much gravity as their mass says they should, and they obey the same orbital dynamics as every other massive celestial body.
We're fucked if a black hole hits us, but we're fucked if anything with the same mass hits us
If you do, you may win a Nobel prize for it
Who had 'Lab grown Black Hole?'
They didn't make a black hole, they just did the supersonic Rubidium gas trick
Us developing an actual black hole would be one of the best things humanity has ever done. It would kinda be like inventing techniques to make fire.
We could throw shit around the orbit of the black hole and get fusion. Not just deuterium fusion! Even proton proton fusion. Our energy needs would be solved practically forever.
We could conduct a crazy amount of experiments on the black hole, see quantum effects of gravity and whatnot.
Maybe we could build one of em Alcubierre drives that don't need exotic matter?
Can you imagine what a "black hole fusion accident" could look like?
No, of course not. The accident eats all the light I'd need for that.
I mean, you could imagine it for a moment.
It would be almost impossible to do something like that without enough fuel though.
Pretty sure any black hole we create would evaporate from hawking radiation before it could be used for anything outside of research.
If we could make Jupiter a black hole, would that be stable enough to not radiate away? Other big body we have access to is the sun and I feel we would suffer more side effects of turning that into a hole compared to Jupiter
I'm pretty sure if we made Jupiter a black hole we'd throw off our orbit and have much bigger problems.
Wouldn't a Jupiter-mass black hole have the same gravitational effects as Jupiter and absolutely nothing would be affected?
My point was more that we'd probably have to increase the mass to be able to make it a black hole, as we don't have the ability to compress it to a singularity.
Black holes aren't vacuums, nothing would change if the mass was equivalent
Yes, but you'd more than likely have to increase the mass of Jupiter to make it a black hole.
That wasn't part of the hypothetical though
Yeah.
Then somebody drops it and it just falls down to the planet's core and eats our fucking world.
That's not really how black holes work. They evaporate really quickly when they're small enough. And if they're small, they don't have much gravity either.
But it will still be pulled down by earth's gravity. And depending on the size, it's not going to just evaporate if it has a planet's gravity pushing rock and metal into it.
A high speed black hole would just punch through the earth, but if it just falls down, it would destroy the planet.
Ok, so even if it "falls down", it will probably evaporate way before it even reaches the center. Even if it doesn't, it will be take A VERY LONG TIME for it to get big enough to eat the planet out or whatever.
It is very VERY difficult to make something fall inside a black hole. Mostly, stuff just zooms right past it at incredible speeds.
The earth would be consumed by the sun way before it gets consumed by a black hole.
You're talking at scales where the incoming mass has a lot of velocity already. In a stationary frame of reference, the matter would more than likely fall directly in since there isn't an appreciable amount of rotational momentum involved like there is at stellar sizes.
Tiny black holes are the kind of thing that physically cant exist for more than a few like picosecods or something ridiculous like that before evaporating into radio waves.
We kinda don't know for sure though. The tinier the black hole gets, the more it enters into the realm of quantum mechanics. We have no clue how quantum gravity works, so ¯\_(ツ)_/¯
Unfortunately an Alcubierre drive dumps a shitload of high energy radiation in the direction of travel when it stops. We would sterilize every world we get to.
What about traveling slightly off axis? Could even tack back and forth.
Isn't that a solvable problem though? Overshoot the target planet by just enough, that it isn't in the hemisphere of the warp bubble pointed towards the direction of motion.
"i have become death destroyer of worlds"