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Show HN: Physically accurate black hole you can put in your room

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Re: Show HN: Physically accurate black hole you can put in your room

#101

Post by kamaal »

hrnnnnnn wrote: post #95
kamaal wrote: post #93

Well I thought this is a real black hole. Forgive my ignorance. But what would it take to put a fist sized black hole in your room.

According to this calculator [1] it would take 11.274 times the mass of the earth to create a black hole with a radius of 10cm. [1] https://www.omnicalculator.com/physics/schwarzschild-radius

0.0001 km, or 10 cm would take 0.00003385 suns, or 6.72857 × 10²⁵ kg

Obviously that's not possible by today's physics.

But lets say it was possible, by placing it some where space, how would one make it ?

Re: Show HN: Physically accurate black hole you can put in your room

#102

Post by antonvs »

somenameforme wrote: post #73
antonvs wrote: post #68

Earlier quoted context omitted.

It’s arguable whether it’s weird or undesirable. There are benefits to using unusual words when they have precise scientific or other technical meaning. It helps identify them as terms of art, so that they’re not confused with their native tongue equivalent, which invariably has much looser meanings.

Sure, but I think there's some cause/effect to consider there. The same logic would have applied in Ancient Rome, but I expect that people would have likely been less casual with their usage of such terms when they also had specific technical meanings. For example many food dishes we have retain basic naming conventions, yet have well understood meaning. In the US a customer ordering spaghetti is likely to be quite u…

> I expect that people would have likely been less casual with their usage of such terms when they also had specific technical meanings.

Why would you expect that? It seems the opposite of what we see in practice. Colloquial language typically makes no concessions to technical usage.

Your example works against your own position. “Spaghetti” is an Italian word, much like the Greek portmanteau that started this discussion. The idea that it implies a particular sauce is purely regional, as you noted by saying “In the US”. (I had to ask an LLM what you might mean - apparently you would expect tomato sauce.) Ironically, that would not be expected in Italy.

So here we have a word taken from another language, which has a local connotation which depends on a shared context. As with all language, one has to learn that context. It doesn’t matter that much what the words are. If the word had been “thinnoodle” instead, that’s what you would have learned and been familiar with. (“Noodle” comes from German and entered English about 65 years before spaghetti, apparently.)

Re: Show HN: Physically accurate black hole you can put in your room

#103

Post by JsonDemWitOster »

drivingmenuts wrote: post #58

Good work! Gimmer two, chief! Two black holes at once?!?!?? Yeah, I'm crazy like that.

If you're not careful sooner than later you will have just one black hole or, worse, no black hole! In the latter case your neighbor down the street might end up with one.

---

Reminds me of my favorite Spongebob Squarepants gag. Spongebob and Patrick Starfish were tasked to paint the house of Mr. Krabs, Spongebob's exacting boss at the Krusty Krab. Because of course this is a cartoon, they have to paint with all the furniture and bric-a-bracs still in the room. They are just somehow expected to paint around stuff.

Because Patrick is dumb as a starfish (go figure) they end up with a big paint bubble threatening to burst and cover _everything_ with a layer of paint.

Spongebob (panicked): Eeeek! Patrick what can be worse than one big paint bubble in Mr. Krabs' living room?

Patrick: laughs oooh I know...

He proceeds to blow another big paint bubble

Patrick: two big paint bubbles!

Re: Show HN: Physically accurate black hole you can put in your room

#104

Post by JsonDemWitOster »

hrnnnnnn wrote: post #95
kamaal wrote: post #93

Well I thought this is a real black hole. Forgive my ignorance. But what would it take to put a fist sized black hole in your room.

According to this calculator [1] it would take 11.274 times the mass of the earth to create a black hole with a radius of 10cm. [1] https://www.omnicalculator.com/physics/schwarzschild-radius

I'm less ambitious and I just want a 1 cm blackhole for display purposes, cool thing to show off to my guests.

Imagine my disappointment at finding out that I'm gonna need about 10^47 chonky house cats to make a 1cm blackhole! Where could I find that!

Re: Show HN: Physically accurate black hole you can put in your room

#105

Post by mazurnification »

20k wrote: post #34

If anyone's interested in the accuracy, this is very 'visualisation grade' software. Its a bit of a pet peeve of mine that people present these sims as being very physically accurate, when they contain major inaccuracies, some of which are very obvious and/or deliberate. This one has some serious physical limitations I wouldn't mind at all if it didn't say that this was a *physically accurate* black hole specifically…

at 1 - is it red due to red shifting due to gravity?

Re: Show HN: Physically accurate black hole you can put in your room

#108

Post by brador »

stavros wrote: post #78
brador wrote: post #59

Earlier quoted context omitted.

What would be the correct latin/greek word for it?

Melanotrypophobia, although the Greek term is "mayri trypa", literally "black hole".

Any relation to the words melancholy?

Re: Show HN: Physically accurate black hole you can put in your room

#109

Post by ButlerianJihad »

dluan wrote: post #89
qwertywert_ wrote: post #40

Earlier quoted context omitted.

Sorry but a word for fear of black holes is ridiculous. Black holes are scary period. Anyone not feeling a deep sense of fear during that VR experience is missing something.

VR is fine when it's small cute bunnies or little golf balls that I can kind of immediately get a sense of scale for. Massive thing that tricks my brain like the edge of a gas giant is terrifying, no matter how much I tell myself it's just a screen or video or pixels.

> Massive thing

Oh, here we go: your sense of scale pertains to volume, not mass. The entire point of a black hole is that its enormous mass is concentrated in the smallest size possible. A golf ball-sized black hole would be a realistic conjecture.

Re: Show HN: Physically accurate black hole you can put in your room

#110

Post by ButlerianJihad »

brador wrote: post #108
stavros wrote: post #78

Earlier quoted context omitted.

Melanotrypophobia, although the Greek term is "mayri trypa", literally "black hole".

Any relation to the words melancholy?

Yes, that is cognate with ancient Greek μελαγχολία, and with the same root: μέλας

https://en.wiktionary.org/wiki/melancholy

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