#Schwarzschild radius

[truphysics]

Neutron Stars

Introduction Neutron stars are incredibly dense and compact astronomical objects, resulting from the collapse of massive stars during supernova explosions. These stars are primarily composed of neutrons, hence the name. Formation of Neutron Stars When a star of significant mass exhausts its nuclear fuel, it undergoes a violent explosion known as a supernova. The star’s outer layers are ejected…

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#Chandrasekhar Limit #Index #Moment of Inertia #Neutron Stars #Schwarzschild Radius #TOV Equation

[kokoasci]

event horizon

#something something theres a lot to be said about the astrophysics references in stormbringer #some things were done well others not so much but im just being really picky #actual good reference to the schwarzschild radius though we love a good astro ref #anyway. i read the light novel and it HURT #bsd #bungou stray dogs #chuuya #stormbringer #bsd art #bungo stray dogs #bungou stray dogs fanart #bsd fanart #bungo stray dogs fanart #chuuya nakahara #bsd stormbringer #skk #kind of #kokoart

[zxal]

TOP 10 MOST OUTRAGEOUS STAKES IN YUGIOH OF ALL TIME

#was looking thru screenshots from my 5ds watchthrough and got absolutely blasted by The Accretion Disc's Schwarzschild Radius #this whole duel is so tense and emotional but objectively this moment is peak yugioh #if your next card isnt a tuner you will be destroyed into particles and vanish from existence. #5ds

[e17omm]

I think the most complicated stuff in Snippets AU will be when I start messing with Time and Sirin freaks out, because she can bend space, but not time, yet both are a part of spacetime. And also neither is part of gravity which has an effect on spacetime. (I find it funny that something like Spacetime requires THREE Herrschers to properly bend - Void, Stars, and Finality - unless one can ignore the other two and bend them anyway. I guess the 9th Divine Key messes with Time... But Im not letting Sirin compress space to make a black hole out of nothing, even if black holes would be required for a wormhole!)

Can you tell that Im into this stuff? Because I think Sirin realistically would be as well considering she's popping up wormholes and pocket dimensions whenever she wants to.

#snippets of sirin schariacs life #im gonna have so much fun when otto starts doing what he does... #mostly in snippets ive just simplified it so that sirin can open portals without having to deal with time dilation #like she just chooses two points in her head and most of the calculation is done automatically thanks to honkai shenanagins #and also any time dilation or gravity or negative matter required is neutralised by honkai #in a similar way the black holes of the 9th herrscher (including the divine key). in snippets. has a FAR larger schwarzschild radius #than they should. a black hole with the gravity of earth would have the schwarzschild radius of a peanut #the black holes welt creates with the divine key would destroy earth on a massive scale if not completely #oh... i should be writing the chapters i actually need to get out before i get to this part #wait... that requires most of the puppet arc #oh #that is so many chapterrrrrrrs

[meatballsu]

Everything Everywhere All at Once

“There’s a scientific calculation you can do for any object in the universe called a Schwarzschild radius, an object that when you compress it down to that radius becomes a black hole. It becomes a singularity and it’s hypothetical. But the idea is, at a certain density, anything will become a black hole.”

#my art #frisk #core!frisk #pls go watch that movie

[spaceraceart]

Monthly Spamath Problem #3

if spaceton has a schwarzschild radius of about 0.5 meters, what is his mass in kilograms? bonus points if you also convert this to earth masses!

hint: if you get a really big number in kilograms, you probably did it right. black holes, even very small ones, are VERY HEAVY!

sorry, i needed to do another one of these asgdhjgasdh. hey, at least it's astronomy-themed this time.

answer under the cut!

#utdr #deltarune #spamton #spamton g spamton #fanart #art #spamton au #spaceton

[nymphaforesta]

I'm really sorry about this.

I was referring to the ingoing Eddington-Finkelstein extension for the Schwarzschild metric, so yes, the Kretschmann scalar does still tend to infinity, but the horizon is no longer singular. However, by observing the trajectory of light cones in these coordinates (observers), no future directed radial null geodesics leave r < 2M, indicating the horizon of the black hole. Once the light cone travels past r = 2M, all world lines lead to the singularity, seen by the fact the singularity slices through the light cone as it tilts toward the singularity. Moreover, inside the Schwarzschild radius, the singularity is now a timelike coordinate rather than spacelike, hence it becomes a point in time in these coordinates.

In reality, Kruskal-Szekeres coordinates are a better extension of Schwarzschild spacetime since they cover the whole manifold, but then the singularity is given in terms of both timelike and spacelike coordinates and it's not as fun anymore.

Again I'm very sorry. I tried to have some light hearted fun but someone had to kill my buzz 😠

i respect you and i admire you but i ain’t reading all that SORRY

[guiltyidealist]

him: you better not compress down to your Schwarzschild radius tonight

me by 9pm: 

#shitpost #space #black holes

[puckszone]

tagged by the amazing @angry-geno-is-score !!!

Make a new post with the names of all the files in your WIP folder, regardless of how non-descriptive or ridiculous. Let people send you an ask with the title that most intrigues them, and then post a little snippet or tell them something about it! Then, tag as many people as you have WIPs.

I don't know if many of these have interesting names, but:

two birds / i also sometimes call it "this will be our year"

schwarzschild radius

ella enchanted!AU

come talk to me about them!!! i'll tag @hiding-from-reality-56 & @fleurywiththesave & @gaps-between-stories & anybody else who wants to participate!

#tag game #i also desperately want to write this urban fantasy gracetaylor pwhl fic but not a single word is written for that one. alas #i would loveeee to talk about it though!

[stickman-on-a-stick]

Oh wow you actually managed to solve the Jello Conundrum congrats

Yeah it was actually comically easy compared to what I was expecting; you would assume the math around black holes would be super complex but the Schwarzschild radius equation is like, easier than some high school physics equations.

#Jello Conundrum sounds like some grand mathematical puzzle

[strangeclayanimal]

don't ask why the schwarzschild radius is there, i don't know either... i made a skin based off of this drawing:-D

#digital drawing #my art #oc #safe fur work #fursona #jesse #minecraft #minecraft skin #i named my fursona after minecraft story mode jesse #and now we have pink-haired jesse in minecraft again #it went full circle

[truphysics]

Black Holes

Black holes are astronomical objects with an incredibly strong gravitational pull, resulting from a highly compressed mass in a small region of space. They play a significant role in our understanding of the universe, general relativity, and the nature of spacetime. Basic Understanding of Black Holes Black holes form when a massive object, such as a star, collapses under its own gravitational…

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#Black Holes #Index #Schwarzschild Radius

[savrenim]

like @otterlycosplay yOU SEE WHAT I SEE I'M JUST SO TEMPTED

“Oh,” Gojo laughs. “Right. I should explain this, shouldn’t I?” He tosses the little red ball up and down. “Binding vow to the universe, makes the technique more effective. I learned that much before they kicked me out.”

The curse is quivering on the ground before him, and whatever his perfectly-okay-maybe-not-perfectly-normal-but-perfectly-normal-for-a-math-or-physics-student roommate had done previously was more than enough, but not enough for the other man. No, Gojo stalks forward like a cat: playing with his food.

(A small part of Suguru is trying to process the words: ‘they’? There’s a they? Does that mean there are other people like him?)

“Mathematicians love infinity, it’s just a construct,” Gojo explains, “but physicists hate it. Infinite density? They think it shouldn’t exist in reality. A mathematical construct, a mathematically acceptable solution to the hypothesis that ‘gravity is geometry’ but not one with any relevance to the real world. Until in 1964, they found one.” He snorts. “And you thought your domain expansion was ‘infinite density’ to get past my Limitless. Don’t talk to me about infinite density.”

Gravity as Geometry, where had Suguru seen that before?

Oh, he realizes. The textbook that is sitting open on their kitchen table right now. But that would mean—

“And it turns out that you can do a lot of things with cursed energy. It’s just energy, after all, and energy is mass. You take a perfect sphere of radiation and fire it inwards, and eventually it reaches its own Schwarzschild radius. Collapses straight into a black hole. Except a very small one. And you know what small black holes do? Evaporate. T-sub-H equals h-bar c cubed over eight pi G M k-sub-B, is that enough of an explanation for you? Hawking radiation, predicted in 1974. You know, I think this is fairly similar to my family’s technique Red. Maybe this was Red all along, we were all just making Kugelblitz black holes and didn’t realize it. But you know what I did realize?”

The curse doesn’t say anything, possibly because Gojo is crushing its head beneath his foot.

“Professor Ashida’s course, last year. The Dirac sea. Another silly ‘mathematical construct’, infinite negative energy eigenstates being filled so that matter could exist. Except it’s real and I can touch it.” Lightning is crackling around his hand, something purple. “I think it’s my favorite technique. The old family records made it sound like it was so hard. But really, it’s not. You just study relativistic electrons in a quantum setting and it pops right out, a mathematical consequence that it took them nearly a century to make any. Well, in Limitless, it’s simple.” Gojo grins. “Hollow Purple Technique: Matter-Antimatter Annihilation!” 

And everything is washed out in light.

#jjk #my writing #I have so many other projects right now I need to not be writing another fic but like #this is living rent-free in my brain

[cannibalcaprine]

i feel like we're rapidly approaching the meta-Schwarzschild radius

[thickness-protection-program]

hole story: i was floating in space and got spaghettified by a supermassive blackhole

Stop making up fake stories for clout! I know you're faking bc spaghettification doesn't happen with supermassive black holes, only stellar mass black holes, where the event horizon is closer to the singularity. Supermassive black holes' Schwarzschild radius is so large you can "comfortably" fall into the black hole without being immediately ripped apart (disregarding the shell of basically fire). You'd only then start being shredded when you approach the singularity and the tidal forces GET you, but by that point you're already in the void and undetectable by us. You liar

[hello-rambling-my-old-friend]

black hole rambles – or, an impromptu astrophysics lesson featuring Genshin Impact

Firstly, sorry for pedantically posting about the physics of Genshin.

Secondly... I’ve seen lots of people saying that Venti can, canonically, lore-wise, create black holes.

Which... no.

Let’s get his burst out of the way first – it’s important to state that nowhere does it say Venti’s elemental burst forms a black hole. It looks like one, yes – but it’s not described as one anywhere, and wouldn’t that be important if it was? It’s instead described as a “stormeye”, which evokes ideas of storms, and more particularly, hurricanes. A centre of calm which everything else is swirling around.

Or, in Venti’s case, everything else is being pulled towards it. It’s, put simply, a vacuum.

But a vacuum is not a black hole.

Let’s compare what they are, first. A vacuum is created by a pressure difference (usually in air as that’s the most prone to that). There’s an area of low density, and an area of high density, and the denser air rushes to the less dense area in order to make the balance equal.

*an example of entropy, for those interested in that.

Now, Venti is extremely powerful for being able to create such a strong vacuum every fifteen *seconds*, and to sustain it for eight of those fifteen. It’s out in the open – all the air in the world is trying to fill that gap, and to sustain it for that long something must be stopping it from rushing all in at once (but still keeping the pulling strength very strong), meaning that there is some fine control going on there. That is a *very* impressive feat, even without a gnosis.

But.

Let’s tale another look at what a black hole is. It’s an extremely heavy, dense point of space – infinitely dense, in fact – that distorts the fabric of spacetime so heavily that light, which travels along that fabric, cannot escape it. 

And light travels fast. It only takes eight minutes to reach the Earth from the Sun. For context, if a car was driving at 100 miles per hour (or around 161 kilometres per hour), at a constant speed, with no breaks at all, it would take over 106 years to get there.

106 years. As opposed to eight minutes. 6,964,200 times the time it takes for light to reach the Sun.

...as you can see, the forces of gravity black holes exert are pretty mind-blowing.

But the strength isn't the point – the point is that black holes are created by densely packed matter practically breaking spacetime itself. Nothing remotely close to a pressure difference.

So no, black holes and vacuums aren’t the same. They’re not similar in the slightest. All they have in common is that they pull things in, and more often than not, black holes don’t even DO that. The material orbiting the black hole is usually accelerated and flung far, far out into space instead. Once it gets past the event horizon, it’s sucked right in, but before that? Not that often.

But, let’s assume Venti did try to create a black hole. What would happen then?

First things first, how would he do it? Seeing as he's the Anemo Archon, he'd probably try to do that by compressing all the air he can in as small a space as possible.

Let’s be generous and say he can use all the air in Teyvat. Completely ignoring any other... possibly important consequences, if what were to happen. How small would that space have to be?

Well... extremely small. And I mean extremely, unbelievably small.

See, there’s a handy concept called the Schwarzschild radius, thought up of by the physicist... Schwarzschild. Basically, it describes the radius at which, if an object of a certain mass was compressed into a sphere, the compressed object would turn into a black hole. And thankfully, there’s a very simple formula for that: to find the Schwarzschild radius of any object, you take the mass of the object, times it by two, and times it again by a fixed number called the gravitational constant. Then divide that surprisingly reasonable number by... ah. The speed of light squared.

(The formula in visual form, if anyone’s curious – where r(s) is the Schwarzschild radius, G is the gravitational constant, M is the object’s mass, and c is the speed of light.)

So, let’s plug in the mass of the Earth’s atmosphere to that. It’s about 5.18 million quadrillion kilograms, or around 1/1,200,000 the mass of Earth.

And the second figure is really all we need to know.

Why?

Well, we know the moon’s Schwarzschild radius already. It’s about 0.1mm, or 0.0039 inches. That’s a tenth of that tiny space between millimetre spaces on a ruler. Very small.

And a very important thing for black holes to be, is stable. And it just so turns out that for a black hole to be stable, it needs to have a mass of... well, about the mass of the moon.

So, the moon is about 1/6th of Earth’s mass. The mass of the Earth’s atmosphere is about 200,000 times smaller than that.

Not stable.

And we were being very, very generous in that example. Because we were using the mass of the Earth’s atmosphere to calculate this. Venti would be using the mass of the atmosphere of Teyvat.

And Teyvat is a whole lot smaller than Earth. Seeing it only has 7 (and a half) nations which will be featured in the map, and if we use Liyue’s size for each nation – and Liyue is very big by Genshin’s standards – each nation can be walked across in only a few Genshin days.

Much, MUCH smaller than Earth.

If Venti tried to make ANY sort of black hole, then, it would evaporate – assuming Hawking radiation is real. But now’s not the time to debate scientific theories.

BUT. The discussion’s not over yet.

Because there’s a little trick used in nuclear fusion (and fission), that can convert matter to energy, and energy to matter, ie mass. Using the mass to energy one, that’s how nuclear power of any sort actually works – because of Weird Quantum Reasons and energy actually having a type of mass itself, the mass of two particles in a nucleus bound together is actually slightly different to the mass of them apart, due to something called binding energy. The tiny difference in mass is released as an EXTRAORDINARY amount of energy, which is used to power many things, from homes to the Sun. 

A purer conversion between energy and mass can happen – but it needs crazy levels of energy, usually in the form of heat, only seen in the conditions at the very beginning of the universe’s creation. 

But let’s say, for the sake of it, that Venti has magical archon powers that can do that, for some strange reason, and he can convert some mystical archon energy into extra mass, which can be used to create a black hole. Would that work at all?

...well, extra mass WOULD be created.

But an obscenely small amount.

Because the ratio of the energy to mass conversion is actually a formula almost everyone is familiar with – the famous e = mc^2. That’s what the formula actually means.

And it’s great! ...When you’re creating energy from mass, that is. That’s why nuclear power works so well.

...Not so great the other way round.

Remember, the speed of light is a BIG number. It takes 8 minutes for it to travel from the Sun to the Earth, and it would take a car at 100 mph/161kmh with no stops a whopping 6,964,200 times longer to reach there. So take that, but squared.

No matter how much magical archon energy Venti has, he’s not going to be able to produce anything heavier than a speck of dust.

Which, again, is being dangerous.

---

...So, as we come to the end of this impromptu science-lesson-slash-pedantic-rambling, we are forced to conclude that Barbatos, the Anemo Archon of Mondstadt, Venti the Windborne Bard... cannot create black holes.

And to be fair, that’s a blessing. I mean, I trust he wouldn’t do anything malicious, but if he gets extremely drunk one day... Klee world be doomed. And imagine if he created a black hole every time Wind’s Grand Ode was cast? Who needs the Abyss or the Fate to destroy the gods, he’ll have done it himself in seconds! And the rest of the world with it!

...which is another, much simpler, way to tell that Venti’s burst isn’t creating black holes, actually.

So maybe we should be thankful that this bard can’t create black holes in canon. And that’s not saying he’s not powerful – his lore can attest to that. And his burst, a sustained vacuum in an open system that goes on for eight whole seconds – is really something not to be trifled with. 

But a vacuum, as we now know, is not anything close to a black hole.

(thank you for reading!)

#this is not me saying venti isn't powerful by the way #he IS #he literally terraformed mondstadt #but creating black holes? #...sorry guys i love venti but i love physics MORE #which says a lot because he is my favourite genshin character #also this is assuming genshin has the same laws of physics as this world #but i'm assuming that the physics of black holes would stay the same? #if only because they wouldn't bother to contradict that because when are black holes going to appear in the story #but hey #impromptu science lessons! #I hope the people who read it found it interesting #genshin impact #aka #a science post masquerading as a genshin one #hoyoverse #in the vaguest of terms