this post was submitted on 06 Aug 2025
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Science Memes

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[–] MudMan@fedia.io 89 points 1 week ago (7 children)

I'm not an astrophysicist, but that ends up being the weird perception thing about them, right? Mostly they're like a star of the same mass, and then a few will get really big and be at the center of a galaxy, but the perception is that of a natural disaster.

Big ball of plasma in the center of the solar system that will definitely eventually explode and wipe out anything left alive on any surrounding planet? NBD. An object of the same mass but it's smaller so it doesn't shine? People picture it as being more immediately violent for some reason because the "light can't escape" thing sounds so wild.

[–] Fermion@feddit.nl 76 points 1 week ago* (last edited 1 week ago) (2 children)

Yeah, black holes in media where they are depicted as a giant space vacuum cleaner is a big pet peave of mine. Unless you get really close, nothing is remarkable about the orbital mechanics of a black hole. The equivalent mass star would have burned you up at a much further distance than the gravity starts to become noticeably wonky.

It's a shame that writers focus so much on the gravity and neglect accretion disks and astrophysical jets which do extend large distances and are visually stunning as well.

[–] AngryCommieKender@lemmy.world 6 points 1 week ago (2 children)

If we ever invent FTL someone is gonna make a black hole bomb.

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[–] Skua@kbin.earth 44 points 1 week ago (3 children)

To be fair I think "light can't escape" thing really just is that wild, it's pretty captivating. The idea of it being the death of a star, one of the most important things to all life we know about, only adds to that sense. Stars are massive billion-year explosions, yes, but they also bring warmth and light and beauty. Black holes are the death of all of that, even if it's not technically more dangerous from the same distance

[–] pressanykeynow@lemmy.world 16 points 1 week ago (4 children)

It's not that light can't escape that is scary it's that the future of anything passing the event horizon changes to eventually end up in the singularity. Black holes are not just death, most of the things in the universe are death to us, black holes are literally the end of time.

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[–] SpaceNoodle@lemmy.world 10 points 1 week ago* (last edited 1 week ago)

The true death of that is more depressing than torturous: Heat Death.

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[–] emergencyfood@sh.itjust.works 12 points 1 week ago (1 children)

Big ball of plasma in the center of the solar system that will definitely eventually explode and wipe out anything left alive on any surrounding planet?

The sun isn't heavy enough to go supernova. (Unless it has a companion, but there's no evidence of one so far.)

[–] MudMan@fedia.io 14 points 1 week ago

It will still expand and shed enough stuff to effectively blanch whatever part of the solar system it doesn't actually engulf, though.

It doesn't even have to go supernova to kill everything, which is kind of the point.

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[–] dwindling7373@feddit.it 48 points 1 week ago (10 children)

Tell me you don't understand black holes using a lot of words.

As far as gravity goes they are equivalent to the star that they collapsed from and just as deadly.

The difference is that you can get that much closer before "impacting" with it, but you and superman would be fucked pretty much at the same distance from it.

And I think you need a lot less than 300 writers to conjure an idea that leverage our fantasy in more and better ways.

[–] sem@lemmy.blahaj.zone 33 points 1 week ago* (last edited 1 week ago) (4 children)

And an infinitely dense point in spacetime doesn't necessarily exist: it's just what general relativity predicts is at the center of a black hole.

The last time our physical model of the universe predicted an infinite value, we ended up discovering new physics eventually (the ultraviolet catastrophe). (Edit: ultrasound was a typo).

[–] Ageroth@reddthat.com 20 points 1 week ago (1 children)
[–] BussyGyatt@feddit.org 6 points 1 week ago (4 children)

yeesh, what was the ultrasound catastrophe then?

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[–] Wirlocke@lemmy.blahaj.zone 23 points 1 week ago (1 children)

Nothing you said about black holes really contradicts what they were saying? Even if a star and black hole can have the same gravity, there is still a shell of space that once you pass you cannot ever return. I'm sure Superman could go into a star and come back out, not so much with a black hole.

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[–] drosophila@lemmy.blahaj.zone 16 points 1 week ago* (last edited 1 week ago)

I mean, the gravitational gradient is much higher. To me this kind of sounds like saying "there's nothing that special about a 10 watt laser, an LED lightbulb puts out the same amount of light", but a 10 watt laser is enough to instantly and permanently blind you.

Its true that there's nothing that special about orbiting a black hole, but I think its not really logically inconsistent (inasmuch as a superhero can be logically consistent) to say "even if superman could survive dipping into a sun he probably wouldn't be too happy if he stuck his arm into an event horizon".

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[–] LibertyLizard@slrpnk.net 47 points 1 week ago (5 children)

My understanding is that the singularity is not proven to exist and many physicists believe it is an artifact of our incorrect understanding of the physics involved.

[–] Skua@kbin.earth 21 points 1 week ago (12 children)

Well, what exactly is inside the event horizon is unproven because we cannot possibly look. All of the rest of the physics seems to check out, though, and we know that there are things out there that behave just like our models of black holes predict. It's an incomplete understanding rather than a necessarily incorrect one. If it is something else, it'd have to be something that looks more or less exactly like a black hole to an outside observer

[–] LibertyLizard@slrpnk.net 18 points 1 week ago* (last edited 1 week ago) (1 children)

I would think an object of extremely high density could be difficult to distinguish from a point of infinite density, especially given the nature of the event horizon.

I’m not saying the models are definitely wrong but usually when one of your terms goes to infinity it is a good reason to be skeptical.

[–] marcos@lemmy.world 13 points 1 week ago (3 children)

All of the rest of the physics seems to check out, though

What is the entire problem, because all of the rest of the physics don't get you coherent answers around a black hole.

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[–] Knuschberkeks@leminal.space 47 points 1 week ago (1 children)

"marauding black death wrapped in a spherical gradient of tortured space time" is a great title for a progressive rock or technical death metal song

[–] JoMiran@lemmy.ml 18 points 1 week ago

"In a spherical gradient of tortured space time" is a great title for an ambient or very slow.and moody electronic music album.

[–] 90s_hacker@reddthat.com 32 points 1 week ago (1 children)

Why is nobody talking about how

marauding black death wrapped in a spherical gradient of tortured spacetime

is such a fucking cool sentence

[–] Apytele@sh.itjust.works 13 points 1 week ago* (last edited 1 week ago)

I'm just excited to see people having knock down drag-out fights about how scientifically accurate tumblr prose is on a comm that's not my responsibly to moderate!

[–] Skua@kbin.earth 31 points 1 week ago (3 children)

I suppose cosmic horror elder gods like Cthulhu and such are not all that far removed from the idea of a black hole. Particularly the ones that are less involved with Earth than Cthulhu is. Nobody is ramming a black hole with a fishing boat. But the early writing on them was done at about the same time as a lot of the foundational theoretical work on black holes (not the earliest stuff but I can believe that the writers didn't know about it)

[–] Sergio@lemmy.world 14 points 1 week ago

Yeah, Azathoth fits the bill in many ways.

[–] pressanykeynow@lemmy.world 7 points 1 week ago (1 children)

If I remember Lovecraft correctly the whole idea was that human mind can't comprehend such things. And black holes fit very nicely.

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[–] Natanael@infosec.pub 6 points 1 week ago (1 children)

Also, extremely pedantic note - black holes were predicted by looking at what happens in the math at extreme densities, long before black holes were actually observed in space

[–] WolfLink@sh.itjust.works 5 points 1 week ago

And some of the scientists who worked on those early calculations assumed it meant the physics was incomplete!

[–] radix@lemmy.world 27 points 1 week ago (1 children)

Teachers: You can't divide by zero.
Nature: Hey guys, check this shit out.

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[–] t_berium@lemmy.world 19 points 1 week ago (2 children)

Now get this: some scientists think black holes might have hair.

[–] MagicShel@lemmy.zip 15 points 1 week ago

Everything was hairy back in the 70's.

[–] SkaveRat@discuss.tchncs.de 10 points 1 week ago (1 children)

But can you comb it all into the same direction?

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[–] jerkface@lemmy.ca 17 points 1 week ago (11 children)

Keep in mind that all the cliches about black holes are about non-rotating black holes, which don't exist in reality. In reality, a spinning black hole has a ring singularity, not a point, and behaves much weirder and even less intuitively than the hypothetical non-rotating counterpart as it smears out spacetime into taffy.

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[–] 13igTyme@lemmy.world 17 points 1 week ago

Just FYI Superman has survived a black hole because the plot demanded it.

[–] Kolanaki@pawb.social 14 points 1 week ago (1 children)

Our hopes and expectations == Black holes and revelations.

[–] SomethingBurger@jlai.lu 5 points 1 week ago (1 children)

And the superstars sucked into the supermassive

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[–] leftzero@lemmy.dbzer0.com 14 points 1 week ago* (last edited 1 week ago) (2 children)

graph function singularities exist as physical features in our world

Do they, though..?

As I (mis?)understand it, as a massive star begins to collapse, getting denser and denser, the gravitational gradient gets steeper and steeper... and time (from the perspective of an outside observer) gets slower and slower... to the point that, from our point of view, the full collapse (or maybe even any collapse below the Schwarzschild radius?) hasn't happened yet, and won't happen until the extremely distant future, beyond the end of the universe...

So, in that sense, from the point of view of "our world", no singularities (except possibly the big bang) would ever exist (yet), all of them being censored not only by event horizons, but by being shoved into the perpetually far future, beyond time itself...

And, speaking about event horizons, isn't the whole "light isn't fast enough to escape" concept a misinterpretation of sorts..? As I (again mis?)understand it, it's not a matter of speed, but of geometry... The way space-time is twisted in such a gravitational gradient, once you get past the event horizon there are no longer any directions pointing towards the outside.

Which is another from of cosmic censorship (or a different effect or interpretation of the above), preventing anything inside the event horizon from causally interacting with the outside universe...

So, if these singularities are hidden beyond sight, causally, visually, and geometrically isolated from the rest of the universe, and perpetually shoved into the far future... can they really be said to exist in our world..?

(Of course there's always the big bang, but we can't really observe that one, only its effects, and it's not necessarily exactly what the original post was talking about anyway...)

[–] Legianus@programming.dev 9 points 1 week ago* (last edited 1 week ago) (1 children)

I think you explain it pretty well, but one thing to add. Due to the General Relativity and thus spacetime it is actually not directions that all point toward the singularity, but as soon as you cross the event horizon all of your future becomes the Singularity, not as a point in space, but a point in time

https://plato.stanford.edu/entries/spacetime-singularities/lightcone.html

This points at that, you would also need to be able to travel faster than light and that would make you time travel backwards in time

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[–] ThatGuy46475@lemmy.world 10 points 1 week ago (3 children)

The CW flash can escape from a black hole

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[–] supersquirrel@sopuli.xyz 5 points 1 week ago* (last edited 1 week ago)

Idk, I don't think most scifi pushes the envelope of what we can imagine, rather it provides a convenient escape to galaxies less incomprehensible than the bewilderment of earth where the author can make a point about spacewar and unstoppable mindless empires.

shrugs

Scifi (like any other genre) needs to continually reaffirm its association with creativity, not assume because paper thin character types are fighting spacewars for feudal empires and space corporations that it counts as pushing the envelope of our imaginations.

/end side rant

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