astronomy

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Kolanaki, in There are 40 quintillion black holes in our Universe
@Kolanaki@yiffit.net avatar

You counted them all?

aravindan_v,

I bet they didn’t count the one that’s in my heart…

Steve, in There are 40 quintillion black holes in our Universe

Observable universe? Or the theoretically infinite universe?

Fuck_u_spez_,

Article says observable. An infinite universe that’s homogeneous and isotropic would have an infinite number of… everything?

Steve,

Indeed.

I_Has_A_Hat, in Nasa can’t open its asteroid capsule - Tortoise

Lol, this reeks of the occasional stupidity behind necessary red tape. For those that didn’t read it, 2 of the fasteners require tools to remove that are not certified for the pure nitrogen environment they’re working in. Because it’s NASA, I can guarantee there is a very tightly controlled list of tools that are allowed to be used in the lab; each of which has gone through hundreds of hours of testing, documentation, and approval by at least one board. So even though all they need is essentially just a screwdriver, it’s going to take weeks or months to get all the approvals in place to use it.

I 100% agree with the rules. You really don’t want to take any chances whatsoever in that field. It just occasionally leads to funny delays like this.

LastYearsPumpkin,

You seem to be talking out of both sides of your mouth there.

They’re dumb because there’s red tape, but the red tape is there so they don’t accidentally ruin the sample? It’s stupid, but it’s a good thing?

This is NASA, the smartest people in the world, who just spent a ton of time, money, and resources retrieving a small sample of material. They don’t want to fuck it up. The tools have to fit in the container, they have to not contaminate the material, they have to do one job and do it perfectly, and they have one chance at it.

Let them take a minute to think about it, there’s no rush here.

Heggico,

But they designed the container… they decided the environment to open it in… why haven’t they already tried and certified the tools needed to open it? Wasn’t that thought of in advance? Or is this just a case of, these tools should work, but for some reason failed? Which is what i’m assuming, since only 2 of the 35 can’t be removed, but still.

LastYearsPumpkin,

The article linked here is kind of crappy. It’s just a single fact stretched out into a couple of paragraphs with no context. Take a look at these real articles, they show the confined space the scientists and engineers are working in, and why it’s so important to take their time doing things right.

universetoday.com/…/osiris-rex-returned-carbon-an…

space.com/osiris-rex-asteroid-sample-passes-goal

If this was just a regular box, you spray some penetrating oil on it, or you can heat it, or you can crank on the bolt until it breaks, then drill out the remaining parts. But all of those options can ruin the sample inside.

This is a box with unique material, they have one chance to open it, and there is no time limit on opening the box. So they’re going to sit down and do some math and figure out the best way to open the box without ruining the contents. They’ll get it open, they just really really don’t want to fuck it up, cause they don’t get a second try at it.

Zoidsberg,
@Zoidsberg@lemmy.ca avatar

Just grab the old acetylene torch and cut er open.

FigMcLargeHuge,

Meteor shit!

octoperson, in There are 40 quintillion black holes in our Universe

I know it’s not relevant and nobody cares but those bigger -illion numbers really tick me off. Like, it was once was a perfectly usable system. It was a million to some power. So a quintillion is a 5-illion, is a million to the 5th power, is 10^30. Simple. But then headline writers got a hold of the words billion and trillion to sensationalise about stuff like national budgets, who cares if they’re using the right words for the right numbers, and now the pattern is broken. It’s, what? A thousand times a thousand raised to a power?

So 40 quintillion is … 40 × a thousand × a thousand to the fifth power, is … 4×10^(1+3+15), 4×10^19? Is that right? 40,000,000,000,000,000,000? Why does it have to be so difficult? It’s just numbers.

Kolanaki,
@Kolanaki@yiffit.net avatar

It’s just numbers.

Numbillion numbers.

octoperson,

That’s numberwang!

gnygnygny, in There are 40 quintillion black holes in our Universe

It lacks precision

perviouslyiner, in There are 40 quintillion black holes in our Universe

🎵 “now they know how many holes it takes to fill the Albert Hall

PP_BOY_, in There are 40 quintillion black holes in our Universe
@PP_BOY_@lemmy.world avatar

I’ve always been interested in black holes. In college I’d lie in my bed at night and try to imagine what it would feel like to enter one

southsamurai,
@southsamurai@sh.itjust.works avatar

You’d be like a limp noodle

Spaghetti_Hitchens,

Pretty sure there's a pill for that

Uncle_Bagel,

Not for a supermassive black hole.

PhlubbaDubba,

You’d slowly be turning into a limp noodle as you approach the singularity from the event horizon

niktemadur, in There are 40 quintillion black holes in our Universe

A gaggle of singularities?
A swarm. A hive. A parliament.

No, no… a SCHOOL of singularities!

PhlubbaDubba,

a SUCC of singularities

GrammatonCleric, in There are 40 quintillion black holes in our Universe
@GrammatonCleric@lemmy.world avatar

Well, that sucks

kalkulat,
@kalkulat@lemmy.world avatar

Heavy, man.

Sterile_Technique, in Are we living in a baby universe that looks like a black hole to outsiders?
@Sterile_Technique@lemmy.world avatar

I’ve seen this pop up a few times, but there are a couple big issues that pop up right out the gate.

Space is constantly expanding with no center. If we’re in a back hole, we and everything else in here are cruising toward the singularity. And if we’re in a black hole, we’re already passed the event horizon, the point at which gravity is so strong that even light can’t escape; and as we progress toward the singularity, that force becomes exponentially stronger… so light from one point inside the black hole would have very limited potential to cross paths with another point… so how is it light from stars is actually making it to us / for the few stars we’re actually in the line of fire for it’s light - if that’s even possible inside the event horizon - shouldn’t the night sky only have a narrow region of visible stars; and shouldn’t they appear distorted as s all hell?

Shdwdrgn,

It seems like you are making the assumption that time and the laws of physics follow the same rules inside the singularity. If we ourselves are inside a singularity, the net result was enough matter to create our known universe… but maybe in the next layer down matter behaves differently and stars can be produced on a smaller scale. Or maybe the matter is heading towards its own scale of big-bang. And what if time contracts to the point that the life of the black hole, and its relative size, corresponds to the life of that universe and its expansion?

A story which comes to mind and presents an interesting theory that could apply here can be found in He Who Shrank.

Sterile_Technique,
@Sterile_Technique@lemmy.world avatar

We’d be somewhere between the event horizon and the singularity - once we’ve made it to the singularity we’d just be crushed into it to join the infinitely dense speck of matter.

Between the event horizon and singularity we can still exist as a unique object/entity, we just can’t move any matter/energy from the inside out.

But once we reach the singularity, we just become more mass in the singularity. No more me, or you, or Earth, etc: just singularity.

The time it takes to move from event horizon to singularity would scale with the size of the black hole, so I guess if the singularity had enough mass to generate an event horizon the size of what we understand to be the universe, then yeah the trillions of years it would take for things like Earth to form, life to develop, etc could all happen as we move closer to the singularity, but we run into the snags like the ones I mentioned in my first post - the observable universe would all be on a crash course toward the same point, and not uniformly moving away from everything as space expands; and the further out we look into space, the more distorted it would become: distant galaxies wouldn’t appear as neat discs, but as stretched lines. We could even use that distortion to infer the approximate location of the singularity and gauge how much time is left before we’re smashed into it.

Shdwdrgn,

But you’re still judging all of this based on our current laws of physics, or that anyone even knows for certain what is occurring within a black hole. Also remember that time loses all conventional meaning once you pass the event horizon. Now compare that to what we think we know of our own big-bang… that we believe all matter started as a singularity, and that in the initial expansion both time and the very laws of physics were quite muddy and took a bit to settle into what we know today. Within the black hole we don’t even know if the concept of matter still has the same meaning – what appears as a known value of X suns to us could resolve to a whole universe if the physics change.

I’m curious why you think the matter coming it to a black hole would be observed are rushing towards the singularity? We’ve already seen just how insanely that much gravity distorts the perceptions around the outside of a black hole, so why wouldn’t the same be true on the inside? Our own universe has a finite amount of matter, and yet the space it is ‘contained’ in wraps around on itself so there is no center. The boundary of a black hole could potentially create the same result – a threshold that we could never cross, but also a wrapping of the space within back onto itself. Also consider the unknown nature of time, what if all the matter that will ever be consumed by the black hole feeds into that singularity while simultaneously exploding into the life of a new universe? In a place where time doesn’t exist, all of time would happen simultaneously, so from another viewpoint the billions of years (not trillions) that comprise the history of the life and death of our universe could happen all at once. We know that as we look back towards the time of our own singularity the math surrounding time and space break down to a point where they no longer have any meaning. The same is true for what happens inside a black hole, it all breaks down and become meaningless under our current math. Until we know more about what is happening, or find some way to peer back before the big bang, you really can’t discount the idea that what happens inside a black hole could be similar to the creation of a new universe. What appears to us as stringification could be the result of the math showing us the entire history of a moving object instead of a single point in time. Hell we don’t even know if time works the same way, maybe once you cross the event horizon time starts moving backwards and what we see as everything moving towards a singularity appears in there as a universe expanding away from it.

Yes all of this sounds like fantastical sci-fi stuff. Then again, what we know about the birth of our universe and how space and time are warped within a black hole also sounds like fantastical sci-fi stuff, and until we have a better grasp on the nature of all of it, there’s nothing yet that proves or disproves if a whole universe could exist inside a black hole.

Sterile_Technique,
@Sterile_Technique@lemmy.world avatar

I mean, yes I’m assuming they follow the laws of physics. To my knowledge everything about them that we actually can observe does actually follow the laws of physics (including things like time dilation), and we can use what we do know to form a pretty solid hypothesis about what we don’t.

I mean, I could argue that they’re actually c’thulu eggs, and you can’t prove me wrong because we can’t look inside! …but there’s also no evidence to support that. Drawing conclusions about reality based on science fiction is silly. We ofc don’t know everything about the universe, but we should stick with what real evidence actually supports.

WitchHazel,

I find it unlikely that the laws of physics apply within a singularity, the place in which there exists more matter than is possible to exist in a single point. Plus, information/matter is effectively shredded and turned into particles by the black hole. There is no way for scientists to empirically prove what actually happens after entering the event horizon, so holding out for evidence is folly. Perhaps you could be more theoretical with your theoretical physics.

Shdwdrgn,

Yeah I agree that we shouldn’t try to contradict the evidence we have without a good hypothesis to back it up, I just feel like we’re still at a stage where the mathematics give us an idea of what might be possible, but that is seriously constrained by our limited understanding of what happens at these grand scales. Without letting your mind wander to the possibilities of what could be, we would never take the time to look beyond what we know. I’m just trying to say that our knowledge of the subject is still greatly limited, and this idea can’t be ruled out completely until we know more. In the meantime, what if someone did seriously explore the notion? Perhaps they’ll find proof that shows it can’t be possible, but perhaps they might also stumble upon a idea even more fantastic.

Sterile_Technique,
@Sterile_Technique@lemmy.world avatar

Yeah I agree that we shouldn’t try to contradict the evidence we have without a good hypothesis to back it up

That’s what I’m saying though - the hypothesis that we exist in a black hole does contradict the evidence currently available. Or at least I think it does - I opened the contractions initially as a question because this isn’t my area of expertise. I’ve had a few relevant classes, and have a casual interest in the topic, so I think I have a pretty solid foundation at least; but ultimately I’m just a medic, so I was kinda hoping someone with a more dedicated background would chime in.

There’s a LOT of BS surrounding the topic of black holes - and understandably so. They’re intriguing as hell, so it’s no wonder that they’re so often the object of artistic freedom. But all’s fine and well to proclaim that they’re some kind of portal, or mini universe, or cleverly disguised alien spacecraft, or even a sentient creature… in the context of science fiction. But to say any of those about black holes IRL should come with supporting evidence, especially if some aspect of the proposal clashes with our current interpretation of what we can either directly observe or indirectly postulate.

blakeus12, in Are we living in a baby universe that looks like a black hole to outsiders?
@blakeus12@hexbear.net avatar

how could this be ‘plausible’, it makes no sense based on how we currently understand black holes.

Artyom, in Are we living in a baby universe that looks like a black hole to outsiders?

I used to think this idea was kinda silly and based on flimsy and handwavey justification, but then I saw a colloquium by a famous black hole physicist on it. Now I REALLY think this idea is silly and made up!

remotelove, in Are we living in a baby universe that looks like a black hole to outsiders?

Anton Petrov just put out a video with a similar topic: youtu.be/l4C6Ll6sIQU?si=ac9K5RKYrbFmyapj

He is an awesome science youtuber and does a great job of explaining research on these kinds of topics.

I haven’t watched it yet but will soon. (It popped up on my feed today and remembered it, just for you!)

agressivelyPassive,

I really like his content, but his way of speaking (can’t even say what exactly) is somehow perfect for my brain to completely tune out. I have to really focus on it to actually mentally process it.

paraphrand,

Yeah, I use his channel to fall asleep sometimes. No shade.

Xyz,
@Xyz@infosec.pub avatar

Agreed. He’s very monotone and I don’t think his mic is very good. I like the content, not trying to tear someone down but he’s not a small channel anymore. Wish the production value was a bit higher to engage us more. I want to watch every video but I only watch the ones that I really want to know more about, for this reason.

LibertyLizard, in Ask Ethan: How did the Universe truly begin?
@LibertyLizard@slrpnk.net avatar

The idea that somewhere inflation is continuing to produce new universes is intriguing. Will they be similar to our universe or have less energy because inflation continued for longer?

Also, the article says we can’t reach them because inflation has pushed them too far away from us. But what if we tried to go there anyway? What exists between us?

Umbrias,

The universe is expanding faster than the speed of light. So what exists between us and distant objects is the future distance between us and distant objects.

Imagine chasing a balloon floating north on a long airport treadmill pulling you south. It’s faster than you could ever hope to run, so the distance between you and the balloon will only ever grow.

This is a sort of analogous metaphor for what would happen if you tried to go to distant objects.

btaf45,

Will they be similar to our universe or have less energy because inflation continued for longer?

Likely similar to ours. The energy from inflation came from energy that is inherent to the fabric of space - dark energy. So it was not diluted.

But what if we tried to go there anyway? What exists between us?

First there is distance. New space would be created faster than we could travel there. There would likely be other problems. For example, matter would not be stable enough to form atoms and probably wouldn’t exist at all. In the inflation universe, the particles are hypothetical “inflatons”, not the particles we have.

LibertyLizard,
@LibertyLizard@slrpnk.net avatar

Is there any part of our universe where this inflationary region is visible? Even if it’s too far for us to ever reach, I’m just curious what the edge of our universe is like and what we would see beyond it.

btaf45,

No. Our observable universe would be way to small to be connected to the inflationary region. Also, the inflationary universe probably doesn’t have any of our particles so it would not have any light photons. It would probably just look like a mysterious dark area to us.

SattaRIP, in Are we living in a baby universe that looks like a black hole to outsiders?
@SattaRIP@kbin.social avatar

Followuo question. Is our universe perhaps a former seed universe contained in another, the same way black holes are within our current universe?

Selmafudd,

And is it universes all the way down?

Agent641,

And at the bottom, a turtle

Unforeseen,

Great A’Tuin

shalafi,

🐢🐘🐘🐘🐘💿

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