Brian Cox - Is The Whole Universe Inside a Black Hole?
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- čas přidán 4. 05. 2024
- Brian Cox - Is The Whole Universe Inside a Black Hole?
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Professor Brian Cox explains the science behind black holes and the beginning of the universe.
Virtually all cosmologists and theoretical physicists endorse the idea that our universe started with the Big Bang. However, problems with dark matter, dark energy, and cosmic expansion have some astronomers rethinking what we know about the early universe.
Our Universe appears to be expanding and cooling, having originated some 13.8 billion years ago in a hot Big Bang. However, it's plausible that what we see from inside our Universe is simply the result of being inside a black hole. This is one of the most fascinating, and yet least discussed, possibilities in modern physics.
Brian Cox and James Beacham discuss the possibility of our whole universe existing inside a black hole.
#universe #science #sciencetime - Věda a technologie
So if we are possibly existing inside a black hole, could it be that our big bang was actually the collapse of the star that created the black hole that we exist in?
but wait...our Universe has black holes too...then inside that black hole is another universe with another black hole...where is the end?
Yo dawg…
big bang is out of the equation right now.
@@quazar912no end. Just recycling😂
@@quazar912nesting black hole 😂
If this is true, then it's assumable that within each black hole observable to us, there is a "mini" universe (mini relative to us). Also, if this is true, it's further validates the concept of a fractal universe, whereby a universe contains multiple universes within it, and that universe is inside another universe along side other universes... bubbles within bubbles within bubbles, forever and ever... Love it!
Not mini, but as large than our, or maybe larger.
And certainly with more complex physical laws derived from our universe's
Is it possible black holes create universes proportional to the matter they contain, and only truly massive and old black holes have “eaten” the right/enough material to create universes complex enough for life? Our universe could have been born into the unimaginably massive black hole at the end of a previous universe, the mother black hole “dying” from hawking radiation but creating new spacetime out of the extreme time dilation & density, allowing matter to exist how we know it. Perhaps matter would not be possible without this process. our universe will end the same way, all black holes fusing into one massive object, perhaps allowing the creation of the next universe like an infinitely layered and evolving onion. Perhaps they would all end at the same moment, or maybe the inner chambers “collapse” first. Interesting topic!
Infinite probabilities = God imminent.
Finite universe = nothing = universe = God imminent
Get rekt atheist.
If I look up our universe, I compare myself like living microscopic dust😄
@@gerardopilorin6355 But infinity is also extremely small. Some men know that feeling. RNG.
rip
Professor Brian Cox's voice has a supernatural ability to calm the human mind and melt away all the accumulated stress. That's why I like to listen to him and learn a lot of interesting information at the same time.
Maybe to people who don't live in England, to me he just sounds like a guy who spent all his youth in Manchester nightclubs dropping acid. Which is actually quite likely as he started out in a band called D-ream.
@@richardcarter5082But do these people talk about science like him? I bet they don't.
If the James Webb space telescope is able to see galaxies billions of years in Earths past, then those same galaxies in Earths past would be able to see the Milky Way galaxy billions of years in the future before it existed duh. Running in reverse is even more crazy. If galaxies are billions of years in each others past then both clocks are ticking slower so their time would be moving backwards.
Anyone can be naïve, it takes endurance to be ignorant. You can lead a cult to water but you can't make them think 🙂.
Maybe images of Hollywood actors can appear to be on billions of TV screens any time we want but physical matter cannot!
Visible light and radio waves are part of the same electromagnetic spectrum. If a galaxies light is billions of light-years in Earth's past (no longer there) then radio waves would allow people on Earth to contact dead aliens billions of light-years in Earth's past!
Einstein's Rainmen never seem to get the joke. Our eyes only retain light and images for 15 ms, if the light and images from galaxies are ( no longer there billions of years in Earths past ) the sky's would be dark.. Images of light cannot travel for billions of years without an energy source. When you don't pay your electric bill, the lights go out duh.
If Einstein's space-time were true we wouldn't need the James Webb space telescope to see the light from Earth's past, we'd just use our eyes to see yesterday's light on our TV's and lamps. Why pay for electricity when Einstein tells us we can see yesterday's light today?! Anyone using GPS astronomy software, a computerized GoTo telescope or equatorial mount can disprove General, Special relativity and big bang in less than 30 seconds by simply dialing in the coordinates. The wisdom of a fool always hides in plain sight 🙂. If Einstein's space-time were true we'd be blinded by the light from Earth's past, yesterday's light would still be on our, TV's, PC's cell phones and lamps. Einstein knew the light from Earths past would keep him up at night so he always made sure to wear a sleeping mask.
Even tho the gravity in a black hole is a weak force it compresses matter to infinite density while anti-gravity blasts out the same matter it compressed at the speed of light.. Explain why (only) light and images from galaxies billions of years in Earths past time travel into our future but not the gravity, electromagnetic forces and galaxies that also reside in the same space-time. Ghosts are believed to appear as images of light from Earths past as well.
Sorry folks Einstein’s ghosts from galaxies past cannot travel anywhere because the past no longer exists. The images taken with the James Webb space telescope are in real time. Special relativity says that a clock attached to a moving object will tick at a slower rate than one standing still.
Explain how the moving clock can tick slower while both clocks are moving forward in time. Our universe is traveling in an element of space that existed before the universe so logically we cannot conclude the Big Bang was the beginning if time. If time expanded from a big bang at the speed of light by 360°x360° the earliest galaxies in Earths past would now be in Earths future before time existed. If the speed of light is finite (limited) to 186,000 mi./s explain how images of stars, planets and galaxies could reach their destination when cosmological objects are moving apart from each other at light speed in a big bang expansion? Automatic tracking?! This this is like throwing a ball to a catcher that that has left the baseball field, billions of light years in Earths past 🙂
These same people also believe the universe is flat as a shoebox while expanding at 360°x360° . Disciples, remember thy 1st commandment, thou shalt not question thy lawgiver of relativity for blasphemers are the devil's pawn. The universe can neither create itself from nothing, reside in nothing or expand into nothing. Space Cat, cult intervention specialist.
@@richardcarter5082I hope he has tried mushrooms!
Too bad he is an IDOIT
Brian Cox is a gem, a fantastic spokesperson for science and a great scientist.
Not often people able to grasp such math and concepts can explain in an ordinary fashion. He is good.
that other shitsucker isn't half bad, either
Brian Cox is actually Boltzmann's brain
U mean Carl
You must not believe everything Professor Cox tells you. The stove must smoke, also applies to him.
This is quite mind-boggling, and I can listen to Brian Cox talking about it all day. His way of presenting is quite mesmerising.
that other shitsucker isn't half bad, either
You mean gey.
I love the idea that the horizon we can't get to is time as a dimension, so we are in a black hole falling in time. This is why we can't go back in time.
This is one of my favorite ideas. I actually think it is more likely that we our universe is the event horizon and not inside. That would make more sense for why we cannot determine where the "center" is.
Been interested for years, but never really heard a discussion based solely around this concept. This was cool, and I can see, that the idea of chasing a horizon which is unknowable to us can be similar. It's a nice thought experiment, and if the math works too, well, there ya go. Thanks for the video.
I think the same way about black holes, literally im realy suprised that am not only one think about this concept 😳
You don’t hear discussions about it, because science generally dismiss this idea. Contrary to what the video says, physicists actually don’t support this idea.
Sure there are some mathematical similarities. So as there are similarities between an orange and the Earth, but it doesn’t make Earth an orange…
There are actually more differences between the universe and black holes than similarities. For example matter in the universe flows outwards, whole in black holes it falls inwards.
However, scientists don’t completely dismiss the idea. If there are some mathematical similarities, then some equations of the black holes may be reused for the universe, even if these are not the same things.
Black holes are not hollow for objects. The edge of a black itself has points of space zero-time zero for any object and beyond this line it is a processing dark matter curing to become space-time medium itself. The holes remains the same, absorption of light matter appears dark and evolution emits light through the same holes.
Have published "New study of gravitation and Fundamental theory of Singularity" [Volume 10; issue 04; 2023] - arcjournals - International journal of advanced research in physical science - open access for free download.
Series of papers (totally 9 nos.) on "theory of Singularity" - The study serves one fundamental for general relativity (macro-scale) and quantum mechanics (nano-scale) by solving the incompatibility between them.
This idea could actually answer a lot of unanswered questions about the beginnings of the universe. A massive star collapses onto itself and creates a singularity. That singularity contains a huge amount of compressed mass and energy. The singularity was the foundation for the big bang. It's also the foundation for the creation of a black hole. As such, maybe what we describe as the big bang was actually the creation of a black hole from the inside. The transfer of mass and energy from the singularity into the black hole (our universe) would follow along with the principals of "conservation of energy" and "conservation of mass". Inflation would follow along with the growth of the black hole.
I have no clue whether or not there is any truth to this but it'll be interesting to hear future scientific debate on the subject.
Nicely explained!
Pretty sure that is not what the video is saying.
Sure, but it would be easier to just say that some 4d matter fell into the black hole because orbits in 4d space are unstable. See the 2012 pepper about the universe being in a black hole.
@@gointomexico there a link? I read one from the 70s and haven't seen much on it. Pbs spacetime did a video on this about a year ago.
@@gointomexico I can't find any pepper from 2012. Most of the stuff I see in the store was produced in the last couple of years, and the jar of pepper I have in my cupboard right now was produced this year. Please tell where I can buy pepper from 2012, and how it relates to the universe being inside a black hole. Thanks :)
At the moment of the universe coming into existence, all the matter was packed tightly into a tiny amount of space. Sounds like a black hole to me!
The universe didn’t come into existence via a ‘big bang’.
Read Penrose…. There was a massless ‘cool’ universe made up of only photons (no mass) before the ‘big bang’ occurred. The Big Bang only shows us the observable universe.
So, if time is a property of the universe we’re missing something.
I’m not trying to be at all clever, and if you can put me right please do.
Kind regards
God.
Well a black hole is an object IN space, matter and energy condensed to a single point IN space... The Big Bang was an object OF space. Matter, energy, and space itself
A singularity, technically.
Derrrp.
@@KingTheLines Try a thought experiment where a black hole is an object in time, and matter and energy condensed to a single point IN time. :)
Love these vids and the comments, always thought provoking stuff
I remember reading a Stephen Hawking book in the 80s, and it ended by proving that the average density of our Universe is the same as the inside density of a black hole (if you are inside it). It was mind blowing then, but I have been sure that we are inside a black hole ever since.
do you remember which book of his it was please?
@@princesslucillaa It was "A brief history of time", but it could be also "What is inside a black hole", I am not sure, it's been a while, sorry.
Why sure? The average density of my friend's bedroom could match my own, but it doesn't mean I'm in his bedroom.
Great video! I ‘ll throw just a silly “what if” idea out there, but what if the universe is like a large pack of dough. It is concentrated at first and everything is packed together tightly and then it expands and opens and spreads while there is still elasticity and resistance in its surface like a fabric. That could account for the attraction that is currently explained by dark matter as it would keep things closer together but at the same time it doesn’t block expansive tensions.
I don't think the universe is comparable to anything lol
There is a Big Rip theory concerning the possible end of the universe's expansion resulting in and end to everything where even fundamental particles are too spread apart to interact anymore and accelerate still further away ad infinitum, as per my understanding of it, somewhat similar to a doughy mass that rises but rises beyond how far the stuff it's made of can stretch, so it disintegrates without ceasing to exist as such, but don't take my brain farts for a truth, read on it; en.wikipedia.org/wiki/Big_Rip
As far as we know it doesn't actually 'stretch' out, there is no point of expansion where the fabric of reality is torn apart or anything like that, what actually seems to happen is new space is created in between areas of existing space, it can expand forever and there doesn't seem to be an issue with this.
You mean our universe is in the shape of pizza?
Brian Cox, one of the best, one of the most modest science communicators that we are fortunate to have around at this time - always interesting, always able to some how explain complex and difficult concepts in such a way that most of use will feel we have at least grasped something, to feel excited about :)
Now, if only the scientists could find an effective way to pack all the world advertising into a small space, and send it into a black hole - that would be a real achievement :)
By far my favorite scientist. After Hawking and Newton of course...
That's what caused the big bang!?!
Way too many ads. Disliked just because of that. 6 in 10 minutes. Seriously.
@@north6502 just pay for premium $12 a month, zero ads, plus you can download videos and play them with no internet connection. It's only like $7 of your a student too.
@@seanriopel3132 Yes, thankyou - it`s a serious thought - I`m just a grumpy old man who resents having to pay - every month just to remove the plague of advertising - as that is what it has become in our modern world, and which I pretty well avoid in my day to day life - but it may yet come to that, it may well :(
At the center of a black hole there is a singularity with "infinite density." What if the way in which we view infinite density is actually describing an infinite expansion of a universe at the singularity within the black hole? Mind boggling and thought-provoking video, thank you.
you mean within that singularity an entire expanding universe exists?
Dude my jaw dropped reading your comment.
The question I have then is if the math adds up. Does the entropy of the universe resemble Hawking Radiation that black holes emit as they decay? If so then I'd say it's pretty good evidence. Far from definitive, but strong.
A galactic ammonite at 0.59 - 1.04
Fascinating upload - incredibly complex ideas explained in ways that are actually understandable to we lesser mortals.
1:43 What fascinates me about all this is the idea that with how much more likely it is for the universe to fluctuate into existence now compared to when the big band occurred, which would suggest that it is quite possible that the universe has in fact spontaneously emerged in a state between the present and what would have been the big bang.
You could also be a brain in space in the far future that has spontaneously fluctuated into existence. With all your complete set of false past memories and current sensory inputs, only problem being the brain will only survive for a confusing second
@@barnowl2832*bzzt* "What the he-" *bzzt*
I am not quite following, is there another way you could word it?
You’re the best thing to happen to you tube physics lessons!!
"thank you for uploading these videos. Even if I'm having a hard night, I just put a relaxing astronomy video on and listen. It always makes my nights go much easier.
Thank you!!!"
binging universe/astro physic vids on here a long time.... This was thE coolest most interesting 10mins maybe, ever.
You meant gayest.
I thought I heard a physicist say that Steven Hawkins believed this to be the case. I’ve imagined this too but couldn’t get past that the language used for both, eg ‘point singularity’ could be a language bias and as the math(s) at this level is well outside my comfort zone, sounding like an arm-chair/internet cosmologist discomforted me. Great video
This made my heart race as I have have quietly harbored such a notion for many years, now.
Not the only one, eh?
No you didn't. It's a false memory after hearing this.
Interesting. I am 78. I can remember thinking to myself at the age of 15, 'What's to say that our universe is only one of many ?' It's gratifying to see that my idea, is now being taken seriously.
This isn't a unique idea at all. Idk why everyone here seems to think they came up with it. It's like how so many people used to think atoms were literally tiny solar systems and it just repeats all the way down
@@trout3685 ok but people are allowed to have had ideas and notions that they have thought of before they were aware anybody else had not all of us keep up to date with everything being scientifically studied.
In short, we dont know
Grappling with infinity is such a mind-breaking concept that we are not built for. Respect to all the scientists who try to understand our reality while knowing they will never be close to all the answers in any of our lifetimes.
The idea of living in a black hole is oddly comforting. Who knows if it’s true. But the idea of near total destruction of matter and then reformation just jives well for me given how our earth has similar cycles in things like geology, the way life forms die and are distributed into the earth and eventually become other things. From a purely romanticized view of the universe, it warms my heart to consider that nothing is ever truly destroyed. 😊
At the end of the day it’s so wild that things exist. I can’t wrap my head around something always existing or something being birthed from nothing.
Same. When I heard this theory I actually felt great comfort surprisingly. And kinda fits the universe for some weird reason I can't explain lol.
Two Words Hawking Radiation.
As above so below. The seasons go on and on even after winter. So I like to think that of life.
And if information lost to a black hole is truly maintained, maybe the universe just repeats the same way over and over again.
Brian cox my hero! Love his book " Human universe "
Could listen to Brian all day he’s so engaging.
You mean gey.
This is mind melting to really think about what this means. Our universe is inside a black hole, which in turn has it’s own black holes. Which means that there are other universes inside the black holes we can observe. Essentially there could be an infinite amount of universes so that every possible variation of every possible variation can exist.
If man survives long enough to travel to the ends of our know universe by manipulating space time, then they would still be confined to a single universe, contained within an infinite number of layers of universes.
It really makes everything seem meaningless if this is true.
It's already a meaningless existence. We're just atoms that have become sentient, the universe looking back at itself like Carl Sagan said.
Which is why I love the theory that all fiction and fantasy is real..if there is really an infinite number of infinite possibilities then dragon ball z is real it exists, so does all of anime and Manga, fiction and non fiction books all stories ever told or forgotten, even now just dreaming up this scenario in which anime is real is being created or has been or will be and shall be...I love this concept that everything is possible
life isn't meaningless at all.We have to give it meaning.
I get the horizon parallel, I think. Does that imply that out observations of an expanding universe mean that the event horizon diameter is staying static (our black hole universe boundary) while the interior of the hole stretches toward a singularity? Thus the center of the object is approaching a singularity (I try not to believe in actual singularities or infinities, just as getting closer to the limits).
Yeah, I don't truly believe in actual singularities, but I don't necessarily disbelief the idea of the "singularity" simply being where space and time completely break down. A black hole being quite literal, a hole in space that we can never actually fall through (only toward) until we are ripped to shreds. This all reminds me of the big rip theory. Maybe the ultimate fate of the universe is as far as we can ever fall into the black hole.
And perhaps the big bang is a white hole?
7:07 I'd be interested to hear more about why the space inside the black hole has to be that large (IE: as measured from the parent universe). Since we don't have any measurements from the interior of black holes in our universe, I would love to hear if it's possible that the dimensions inside the blackhole could expand into a bubble of space larger than the exterior.
What if we are shrinking relative to said universe?
@byurBUDdy That instead of the universe expanding everything is just shrinking which gives the illusion of expansion.
And inside the universe of a black hole are other black holes, each with their own defined universe. It boggles the mind!
Further to the black hole models describing a flat event horizon, zero volume and time-space conversion. It's reasonable to suggest size is subjective to the dimensions of the observer. 'Large' viewed from outside our familiar dimensions may be a singularity.
Does the universe tell you? It told me my idea of colliding black holes forming universes like a Christmas tree was wrong.
I've been talking about this ever since I first heard that the acceleration rate of the universe is increasing, and it's a steady rate based on distance from us. The most logical explanation I could come up with is that we are living in a void inside a universe that is filled with matter. Basically the universe didn't start with a big bang, it started with a little void. The natural state of the universe is to be filled with matter. But when a void is formed then it continues to expand because the matter at the edge of the universe is moving away from the void.
And the Hawking radiation is super interesting, I'll have to look into that because around a decade ago I had an idea that black holes had to be giving off some form of energy. It's one of the only explanations for why the black hole at the center of every galaxy is roughly the same percentage compared to the total mass of the galaxy. Basically something has to balance the pull of gravity towards the black hole, which would be energy given off by the black hole. I've been thinking it's just because black holes are fairly messy eaters and would give off some energy as they absorbed mass.
Seeing as all of your content is quite literally taken from other sources, it’d be nice to link them. So if we’re interested we could easily learn more from the full lecture/video.
Could be like what if the constant expansion of the universe is the same as the black hole “eating” everything so it’s just adding what’s it’s eating causing the universes expansion
Totally
Yeh that was my main thought process while watching this.
Expansion of the universe is accelerating. Basically we are falling into a black hole. Which is on the outside of observable universe.
@@johnmurray3346 My main thought was how do people actually believe brian cox is in any way related to this mediocre youtube channel. It's obviously his speech being overplayed over some crappy guys youtube videos. The whole premise is about black holes and the universe being the same thing and the commentary very loosely fits as if he just googled brian cox talks black holes and pasted it in.
@@CoReeYeWhen we look at distant galaxies, we are looking into the past. And when we visualize the future, we are looking into our own universe's event horizon as it eventually surrounds us, leaving no other galaxies to observe in the sky.
Like the idea. The moment of the big bang is probably the same moment when the black hole is formed or the singularity is created. Just it seems to assume that black holes can be formed inside the parent black hole. How many layers the onion could have, and within which layer intelligence could be formed 😀
Infinitely many universes, all nested into each other, each with slightly different sets of physical laws. That’s my opinion anyway. Lol
in the universe inside a blackhole, the time flows extremely slow compare to the out side universe.
so, when two blackholes collides and merge together, it's still the same big bang moment for the universe inside the blackholes.
We therefore exist in a mandelbrot.
Turtles all the way down.
I doubt a black hole has enough energy to create a universe but it's a cool theory
This just makes me have so many question. So was the big bang the formation of the ultra-mega black hole? And all the black holes that we see in the observable universe can just go right ahead and form despite already being inside of one? And everything expanding away from everything else is on track for being inside the event horizon of a thing that drags everything towards it?
My hope is that the finer resolution of the JWST could clarify a tension in the cosmic expansion to harden the hypothesis that our cosmos could be traversing through a polarised universe funnelling through to the quantum venturi of the theoretical minimum that is the singularity - equated by the equity of Einstein, Hawking and Beckenstein.
So if we are inside a blackhole, the universe containing that(our) blackhole also lives within another blackhole? Wanted to add, if that's so it seems fractal like in structure?? Don't know if that makes sense??
Yes, infinitely nested universes is my opinion
It doesn't. Literally none of it. Not black holes, nested black holes, infinite black holes, black holes all the way down.
It's all absolute twaddle.
I actually asked this question on Startalk years ago but it was never answered.
If nothing can escape a black hole, not even light and the universe is expanding faster than the speed of light, is it possible that we are inside a black hole becoming ever smaller inside it and therefore can't see the edge?
Maybe the big bang was the moment our universe was sucked into the black hole.
As for the existing black holes in our universe - what would be their relationship with themselves and whatever is beyond our event horizon? What are your thoughts on this?
Do we now call it the big Suck sure seems logical
Also, if our universe is ever expanding, does that also indicate we’re living inside a blackhole that is consuming everything?
So we're inside of an asshole that shot us out with continuous matter expanding our horizon of our toilet bowl universe 😂
I've seen the Brian Greene video on the same subject, but my theory is that we are in an expanding white hole whose beginning was our big bang and all the rest of it but the inflation that surpassed the plasma explosion/generation or the Big Bang is an Eternal Inflation and is what our visible universe is traveling through at a slower expansion, from the plasma density, but increasing from the pull of inflation. This background I call Tension Dark Energy/ TDE also caused spin from any dense matter that would drag against this TDE flow and that's why things spin, which leads to form, mass, sentience, time and consciousness at its most fundamental form.
What if the big bang is a white hole, and the big rip is us approaching the event horizon of the black hole?
It's almost like these events in time, the big bang, and the possibly eventual big rip, are actually locations in space, inside the white and black holes.
And then locations in space are actually events in time. Light never gets to us instantly. When we look at far away locations in space, we are looking backwards in time.
I remember being told that because black holes fiddle with time, if we were suddenly in the pull of one, we would never know. The instant before we were pulled in against the instant after we're in its throes, we would have no idea. I often wonder if that's true.
We could live on an event horizon, which would explain why we can never achieve 'c' : Due to the gravity well of the black hole on which we exist
time does not exist,
@PimpDaddyStyles yes, yes, it's a construct of man to explain change, yada yada yada...
@@PimpDaddyStyles but i thought in order for the universe to gain more entropy time does have to exist
"Space is big. Really big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space."
-- Douglas Adams
One of my favourite Quotes by Douglas Adams.
not really something worth quoting tbh.
If space is so vast, why does light reach its destination, instantly? No matter the distance
@@wande.r it doesn't...
@@kevinb9830 well it does.
Light travels at the speed of light, when travelling at light speed, time stops .
When a black dissolves, what happens to the other black holes nested within it? Upon watching this video, I immediately thought of the links to multiverses. Really recommend Max Tegmark's book on multiverses. Basically, the universe is a mathematical structure.
Black holes don't exist. Period. They're bloody science fantasy nonsense.
The notion that an object so dense and massive, with such high gravitational force that not even light can escape, that then somehow "dissolves" or evaporates, is self-contradictory fucking twaddly **nonsense.**
If it can evaporate, it's not a black hole. If it's "belching," it's not a black hole. IF it's shooting particle beams out of its asshole, it's not a black hole.
Astronomy/astrophysics has lost its fucking mind and doesn't even understand its own concepts anymore, or how ridiculously contradictory they are (internally, and with respect to actual observations).
They “die”. 😃
I'm struggling to understand some things about black holes.
1) Is the "depth" of a black hole largest after a star collapses which causes the black hole. Thereafter does the gravitational pull continue to fill the black hole (thus reducing the "depth"). Yes, the black hole gets bigger But is it's depth reduced? Does it's gravitational pull reduce over time?
2) Does a black hole ever get to the point the gravitational pull ceases to impact the space/time continuum and thus is no longer a black hole??
Cheers
If the size of the observable universe is about the size it needs to be to form a black hole then it also suggests we are pretty much slap bang in the middle of it or else we would be able to observe one of its boundaries. This seems extraordinarily improbable, which makes me think it is vastly more likely that the universe is way way bigger then what we can observe, which as far as I'm aware is simply a function of the speed of light.
Isaac Asimov raised the conjecture that the universe was a black hole in his book about them in the 70s. That was based on the universe's density such as we estimated it back then. That didn't hold up over time as new data came along but it's still an interesting footnote here.
Gene Wolfe also wrote that Black Holes connect to White Holes in a lower-level universe in the Book of the New Sun
@@tasosalexiadis7748 Asimov's book wasn't fantasy.
@@Ni999 Neither is Book of the New Sun
@@tasosalexiadis7748 It most certainly is. Are you high or just very young?
@@Ni999 Neither and you certainly haven’t read it.
So how does this work, do you take the permission of the scientists to use their clips from other videos, or do you just have to reference them and you just take without permission. Just curious how it works. Thank you
I remember watching an episode of Horizon or Wonders of the Universe that touched on this subject. I was fascinated and Googled "do we live in a black hole?" but was disappointed by the lack of information explained in layman's terms.
This video is the closest thing I've found to answer that question.
It also helps with few other basic questions I have,
The big bang - how do you get everything from nothing?
If there was nothing, where did everything come from?
And, If the universe is expanding, what is it expanding into?
And have you ever considered the possibility of a conscious creator?
@@experiencinglifeisthepurposeThe universe itself is probably conscious.
Otherwise the only conscious creators are us, like when we completely make shit up and decide to call it God
This is absolutely the case in my mind!
But to add to this. I believe visible light when it crosses that event horizon becomes dark matter once it does break the speed limit of light, and That is space itself.
Can no longer see it, but it can be bent twisted and warped. Would we be able to detect photons if they were invisible?😅
Brian is amazing! Personally, I think that the universe has always been around and black holes are its way of recycling and regenerating itself. Goodness knows where the matter that goes into a black hole goes, but it must go somewhere. That's my hypothesis with my google phd. :-)
Follow-up question: If the universe is eternal, and all energy within it must be, as per the 2nd law of thermodynamics, then are we not also eternal, since we are part of the universal energy cycle?
Love your way of putting it. Actually makes a lot of sense.
I always loved the idea that a black hole collects material until it pops like a balloon and creates a new universe
I have always imagined black holes work in concert with each other to siphon off material to create more universal constructs in other dimensions. Just part of this incredible machine whose only purpose is to create at all cost.
That’s fun haha
@@EricDMMiller You sound so obnoxious, this specific topic is speculative anyway. Let the person have whatever ideas they want as long as it nourishes an interest in science.
hint............black and white Holes
wrong!
One confusing point in the video (not sure if this was a mistake or not) was when it was stated "if you condense all the matter in the observable universe, the resulting black hole would be the size of the observable universe" - exactly how does that work? If the resulting black hole is the same size as the area that the matter occupied when it wasn't condensed, doesn't that mean that the matter wasn't really condensed? If someone could clarify this that would be great
I always thought i was depressed. I feel like ive lived in black hole my entire life. Now i find out we all do? Incredible
The older I get the more apparent it becomes to me that the distance we should be considering is the distance in size from our point to the infinitely small and to the infinitely large. No matter how far we look outwardly to the universe it will always be infinitely large and no matter how much we look inward at our universe it will always be infinitely small ( from our point of reference).
Our entire visible universe is probably infinitely small from another vantage point, and our subatomic particles are probably infinitely large from a vantage point.
It certainly makes some kind of sense and solves a lot of problems too, although if it's true that puts us right back at square 1 in figuring out how it all began, or if it even has a beginning at all.
@@memitim171 There's a good chance it's not solvable from our perspective...No reason to assume that we *can* solve "how it all began".
@@robinhoodOO7 Maybe, but there's no reason to assume we can't either.
@@memitim171 I like to belive God made it so we have the materials so we need only build the tools to find him..
I personally believe the answer is out there to the question of "why" and "how" but we sre far to young, stupid and ignorant to even begin to find those answers. It will be a very very very long time till we can get there I just wish I was immortal so I can watch it all happen step by step and finally see the end and the beginning
Science is cool, but preserving the sanctity and greatness of the United States is cooler. Trump 2024.
Your uncle Brian Cox is way better than Neil DeGrasse Tyson.
Well this Christmas you can regale your uncle by telling him the story of the Big Bang Kilonova Hypothesis; formerly Big Bang Hypernova Hypothesis.... but the large scale anisotropies of the CMB is the smoking gun. You can tell him that fractal geometry is the cosmological principle and thus self-similar patterns happen irrespective of scale. Lovely thing about the philosopher's stone, a kilonova being the binary merger of two neutron stars, is that one inside our universe will create Earth size volumes of pure gold. As for a neutron star being composed of only neutrons arranged in crystal lattice is that it is the mostly perfectly homogeneous and isotropic form of matter. Effectively it is Georges Lemaitre's primeval atom. Of I had go and discover, then define the Superverse and subverses in order to provide context.
@@robertwilliamson6121 unnecessarily rude lol, it's not a competition.
@@Miss_Claire found the Tyson fanboi
@@Miss_Claire Oh….excuse me. I’m sorry. Did I say something bad about Tyson? Did I call him a bad name? ……..Nope ! LOL 😆. What are you? Some type of censorious leftist? I have the right and freedom of my opinion, whether you like it or not. And in my opinion, Brian Cox is way better than Neil DeGrasse Tyson. I stand by my opinion.
Something that ive been searching in the comments for that has occured to me after watching this video in which i havent seen anyone speak about here, and would love to hear some opinions and other thoughts on is:
If we really are located inside a massive black hole, then what the hell is outside our black hole?
- Is it a continuation of our own universe?
- Is it, for lack of a better word, the 'real' universe, meaning our own inside this black hole is simply an inferior, imitation universe?
- Or maybe its simply just nothing and everything we know and will know is confined to this singularity?
- Could this be an explanation to the apparent empty and lifeless universe we live in and could this alternate reality beyond the event horizon be bursting with intelligent life everywhere, studying us from the outside in?
Let me know your thoughts im very interested!
Is there a theoretical balance? As the black hole emits energy (and therefore shrinks) does it not, at the same time, continue to take in matter? Is there a theoretical equilibrium?
I like the sound of being inside a black hole. It just kind of makes sense to a regular mind like myself. I used to have strange dreams about being sucked into a drain, like a plug in a swimming pool and being sucked into it as the water drains. I realised as I got older that these were correlations to black holes, I always had a feeling we were inside a black hole already and it's stuck with me ever since. I know this is probably going to sound silly but the pupil always reminded me of a black hole too, how when you can take certain compounds, your pupil dialates and your literal reality can change in real time. How beautiful the iris looks surrounding the pupil always reminds me of the universe. We are the universe, its amazing 😄
Dude the Iris up close is unexpectedly, incredibly beautiful.
You are a genius
🙉🙈🐒💩💩💩
So if we are inside a black hole, in which there are other black holes. How many times does this continue inwards?
Is this available on DVD? Do you have this video on Facebook so I can download it to my phone?
And just like that... boom... my mind exploded as I was trying to imagine the size of the universe... thanks mister Cox! 😉
Neat, thought about this exact thing when I was younger and never really was able to drop the thought. It's cool to see that it's something being studied seriously.
No you didn't.
Same!
Yep
Same!
Same
This breaks down a little for me when I think that for this to be true, this black hole inside which we exist would have to contain the other supermassive black holes that we can observe. Is that possible?
No as time and reality itself wouldn't make sense if we were sitting within one.
I saw a video that said Penrose diagrams show that the interiors of black holes expand over time. Is that true and more evidence that we came to be from the singularity of another black hole.... in aligns universe?
It makes sense since everything in our universe expands outside the Hubble sphere faster than the speed of light. As we try to travel to the “edge” of the universe, it moves away from us. Fascinating theory!
I can't shake the simple misunderstanding that things actually *can* fall into a black hole.. time stops at the event horizon, which is not even the black hole yet. They're really the most difficult thing to fall into in all of existence.
I think the point is that it's relative...Time appears to stop relative to the observer. It continues for the object that crossed the event horizon.
@@robinhoodOO7 not exactly. To an outside observer, you literally never cross the event horizon. An infinite amount of time must pass before you will have cross into the black hole.
For you, you would just go right through it normally. However the moment you’ve entered the event horizon, not only can you not escape, but there is nothing to escape to. The outside universe has already experience an infinite amount of time and has already experienced heat death.
@@Herzyyyy or if we really live inside a black then a new black whole was created
When I watch this type of videos I always remember a weird theory I thought some time ago and never told anyone nor put it into words until now:(warning if anyone reads this, english is not my native language)
-Possible theory of gravity and time: at the big bang, time and space began(outside the bubble of the big bang time doesn't exist similar to the inside of a black hole), space expanded at the speed of light, and there was only energy in space at the beginning. When matter began to form also gravity appears.
Everything travelling at the speed of light is timeless, the clock stops(light is timeless)(Theory of relativity), there’s no time inside black holes (timeless), time near a black hole passes slower.
If the effect of gravity travels at the speed of light (important), here is a theory that gets in my head with all the previous data and when watching astronomy programs like this one, hard to put in words but here it goes:
Space expands at the speed of light in every tiny bit of space, and this can be observed by lighting a match. In other words, light is the fingerprint of space expansion(like rain in a calm lake), so space expansion overlaps in every 'inch' of space and all this chaos of space expansion ends up as equilibrium as we see in the vacuum of space.
-Equilibrium except when there is matter.
The effect of space expansion, reflects in matter as time(important).
Gravity effect is directed to the point where less space is being created.
Matter, blocks this space creation(and expansion(lighting a match)) breaking the space equilibrium and producing gravity, because if there is less space being created in earth core and every place where there is matter, then there is more space being created in earth orbit (and expanding towards earth)therefore gravity comes from space!!!
Inside black holes matter is very compact and there is no space being created, therefore the time stops and so light doesn't escape black holes because light travels only where space is created. There’s a big disequilibrium on the frontier of a black hole due to creation of space outside and not in the black hole therefore there is lots of gravity near the black hole).(also time slows near places where less space is created).
Light escapes stars because they are not compact enough so space is still being created inside to transport the light.
This theory might explain why galaxies are getting further from each other at an accelerated pace and how galaxies maintain its matter without the need of black energy and black matter respectively.
Also this is a theory formed by a spectator of astronomy programs, and this theory possibly already exists and was already disproved, possibly only I find it interesting and it might be discarded easily by an expert. I only put it here because I don’t know anyone with this kind of interests to discuss if this theory is plausible.
Penrose's idea - Conformal Cyclic Cosmology - is intriguing but pretty difficult for us mere mortals to understand, but worth a gander if you're interested in cosmology like this.
Could the matter gathered after the formation of a black hole be compared to dark matter? The formation of a blackhole requires a certain amount of mass to form a singularity. That singularity mirrors our bigbang. A blackhole continues to gather mass the same way our universe continues to form dark matter which accelerates expansion. Or could the entropic decay of a blackhole be the dark energy in another universe?
If we don’t know how big the entire universe is, how can we say it would fit into a black hole the size of the observable universe? Interesting idea though.
You dont know how big a black hole is if you are IN it. (Beyond the event horizon).
Probably forces you to orbit at c before the event horizon crosses you, and would therefore be zero, but maybe not. Popsci is wrong, thats pretty obvious, but science says its unobservable, untestable, and therefore not science at all.
just imagine our universe inside a black hole like the one at the centre of our own galaxy....we have simply been crushed down in size to fit inside the black hole, but to us the black hole (universe) is so vast in size in comparison to the size of our planet and galaxy.
@@footyball66 don't forget black holes litteraly bend and warp space-time meaning if we had a black the size of a golf ball it would look and seem small but inside that black hole space and time are so warped and bent and stretched that just like the tardis from doctor who it's bigger inside than outside
@@PotatoeDaddy maybe but it could also just be as simple as bigger black holes are less dense than smaller ones and were inside a giant one
who knows
I’m not a physicist, I’m just an enthusiast but I’ve thought for a while now that this theory is the most likely explanation of what’s in a black hole.
If there is an entire universe inside each black hole in every universe then that also ties up with the multiverse theory. 🤷🏼♂️
If I'm understanding, there's almost only a semantic difference between cosmic background radiation and an event horizon from the inside. It would explain the "Big Crunch," being our home blackhole having exhausted all available external matter that enabled its growth, leading to a contraction as the hole collapses in on itself.
It's far easier than you think, guys. Time is moving backwards for us. As you approach an event horizon from the outside, time slows until it stops. What happens on the inside? As you move towards the singularity, time moves more quickly in reverse. Think about what the big bang looks like in reverse... Makes a lot of sense that the big bang was not the beginning, but rather the end of time.
I wasn’t aware the information paradox was solved in 2019. I would have expected a Nobel price for such a discovery…
I've always been fond of the idea we are just living on a monocle of an atom in a much bigger universe, IDK why that appeals to me as it would just make us even more insignificant but it's fascinating to think about.
We are infinitely small and insignificant in an existence so vast it can break your brain. What makes things significant is the fact that we are alive and feel. We were formed and invented the idea of significance in a chaotic primordial soup of space dust. Pretty damn amazing huh?
Like what even is this? How am I Me? What is this consciousness? Why is anything? What is everything? What for?
We are each conscious pieces of the universe itself looking at itself going "dude wtf"
@SeanVito and what the movie prometheus is right? What if God or gods that ancient civilizations drew and wrote about is some beings that created us and so on
9:26 F(magnetic) = B I L, if they are still in vector form as indicated by the arrow superscript on the F and B, should be
F = IL x B, (where F, L and B are vectors) Cross products are not commutative.
"Black hole cosmology" has been a pet theory of mine since the 80's. I'm glad to see more cosmologists taking it seriously rather than dissmissing it out of hand as "just a coincidence". Yes it's untestable, but so are singularities (or strings).
I think I have a pretty good idea of how this would all work. wrote out and idea I had on time dilation a few years ago and how you would witness the end of the universe if you ever fell into a black hole. the other side of the idea was that once the universe ended you would be destroyed and a new big bang would happen. there would need to be a symmetry of time dilation and it's contraction, maybe what we think of as the great expansion phase we observe.
also this says that there are possibly infinite universes, dislocated from each other like a branching tree with each new fork created from a new black hole.
triply mind blowing stuff.
still doesn't explain what started it all. heck. what was that thing i heard before. matter and energy can not be created nor destroyed, only transformed. where did it all come from?
Lol. What a sick joke
God. It came from God!
Omg, I loooove the graphics! 💖😘💖
What does it mean that "if we make a black hole out of the observable universe, it would be a little bigger than the observable universe"? at 7:07. Doesn't it have to be much smaller, compacting all the mass together, increasing density?
Here's an interesting hypothesis that I've been thinking about for some time When a person dies they always talk about traveling through a tunnel and then they reach the other end where there's a light Maybe they're going through a black hole When the soul leaves the body and they get to spend a great deal of time on the other side meeting all their relatives and friends and animals Wouldn't that be a nice thought
Nice thought, though I don’t think there’s much truth to the claim that people who died (momentarily) always see a tunnel or so. From what I’ve heard, most people who’s been dead hasn’t experienced anything at all. In Sweden where I live, a big podcast had a guest who was dead for 6 hours (deeply frozen to a temperature that was perfect to be resuscitated from). He spent two years in a hospital after this, but is fully functional now and back in a normal life. He got that question in the podcast. What did you experience while being dead? He said: Nothing. Like sleeping without dreaming.
Found an article about him now. He fell into freezing water from a canoe. It took two hours before the rescue team found him. By then his heart had stopped. They rushed to the hospital and six hours later they got the heart back beating again. They kept his brain cooled down for twelve days and then he woke up. Started speaking directly. Lost muscle function in his leg and has nerve damages but can live more or leas normally now. This happened in 2015. He do not believe in an afterlife :)
You are Spot on Joel, Dead people say that All the time.👍
It's my understanding that even black holes can and will diminish via Hawking radiation over vast amounts of time until they actually cease to exist. So assuming our universe exists inside a black hole, I find it interesting that our confirmation of an ever-expanding universe could, at some extremely distant time, actually reverse and shrink as "our" black hole radiated away. I just hope it lasts long enough for the Cowboys to win another Superbowl.
Maybe dark energy causing space to expand and accelerate in our universe bubble is just Hawking radiation expanding out of the black hole that we're inside and moving faster the nearer it gets to the event horizon on its way out.
🤣 ya me too bro
🤣 a real Hail Mary but just maybe
What differences, if any, should there be between the formation of a black hole that is and that isn't inside another black hole? If there's any testable/observable difference, could that answer whether or not we're inside one?
Gravity in a black hole is very strong.
The person in weak gravity sees his clock run normal and the other clock (in stronger gravity) run slow.
For us, outside the black hole, it takes a black hole 10^100 years to evaporate - the clock in stronger gravity is running slow, according to our observation. But for the observer in the black hole, our clock is moving fast, while his is moving normally.
We see a black hole evaporate in 10^100 years, while everything in the black hole experiences an instantaneous big bang
I like the idea that inflation at our big bang is really just a baby black hole consuming local dust and stars and atoms etc and then increasing faster as it gets more massive and more able to attract stuff to itself.
I’ve always thought that we end up with a new universe when all the black holes get together and join as one.
Same
Many black holes are too far apart to ever merge together. Even though it takes an inconceivable amount of time for black holes to evaporate, many would do so before ever merging. It's an interesting idea though, I wonder what the minimum size a black hole would need to be to create a smaller universe. Just speculation of course.
so, say we are in a universe inside a black hole which is in the middle of a galaxy, what if that galaxy collides with another galaxy... could our universe be ripped apart?
Exactly. Surely our universe and all matter will end up in one super big black hole because gravity. At some stage the expansion of the universe will be stop and begin to shrink to the point where it creates another big bang and another universe like ours?
@@tomasmazar2029 Not necessarily, there's no evidence to suggest that the rate of expansion will ever stop increasing. We'll have a better understanding when we find out more what dark energy actually is, but it's more likely the universe will rip itself apart. That or maybe what Roger Penrose's theory of conformal cyclic cosmology suggests, that once there is no mass in the universe it forgets how large it is and undergoes a conformal transformation.
What if instead of forming a singularity, the density of a collapsing star hits a certain point and it’s entropy decreases to near zero. Then it bounces back to create a new big bang inside its event horizon. Since the horizon essentially provides a barrier between the parent universe and itself, it could have its own timeline, scale, properties etc
If we are inside a black hole then that means we should see more stuff become visible as new matter falls into our universe from outside. I have no idea if that observation has ever been made. And if it has then it would be hard to tell the difference between that being new matter becoming revealed or simply something that was there that we overlooked.
It is a really simple thought experiment that shows the way.
If we follow the theoretical physics in 3D (but remembering that we are in a 4D universe) and pass from the outside of a black hole into its interior (I suspect everything is reduced to its sub particle state during this transition). We theorize that space becomes time and time becomes space. If we could observe this transition from the perspective of the matter going in we would look back to see what would be the center. aka we would have emerged from a central location after some strange expansion (transition) period (much like the way we look at the big bang, or maybe the big continuous inflation). Matter would begin to slow and cool, and entropy would again begin to emerge as we plot our pathway toward the outer event horizon from that perspective. We may even accelerate toward it.
>
You have to flip perspectives If you enter the outside you emerge from what "appears to be" the center of the singularity and travel towards what "appears to be" the outer horizon of the singularity ( The core of the singularity if we viewed it from a 3D perspective externally from the black hole.
>
If we imagine a sphere in 4D the inner most point, and the outer most surface are actually capable of being one and the same depending upon the polar state of space time. Each can change position of perspective in the 3D realm. Don't be thrown off by external 3D size of a black hole. As we know from inflation size isn't really as important.
In a deep meditative state I've experienced absolute nothingness (to myself I called it the great nothingness, cause that how it felt). The understanding that absolutely nothing and absolutely everything exists and happens all at the same time at one moment. I found myself as a part of that nothingness, just like if I'd be a drop in the infinite ocean. What I experience now as "me" was just one of the infinite projections, in infinite universes, all happening at the same time. Like all the moments of this life, past lifetimes, future lifetimes - all happening now. At this very moment. There's in fact no past and no future.
How did you meditate so deeply?
It is a very interesting experience. To have an awareness that all things can exist at once, and all time past and future is the here and now that is with you at that moment. It is a special experience that few achieve. Your world and reality will be somewhat changed afterward, but it's OK, you have just gained a higher perspective of the universe. Welcome to the club 👍 :)
No you didn't
There is a past and future as it is observable and measurable in our universe, and if infinite universes exist, each of them would most probably be subject to the same rules, black holes may be conduits to these other universes or just big repositories of energy and matter, like a universal power generator, how you would observe or measure multiple universes is a problem for another day!?!
@@Earstolisten This state I achieved unexpectedly during self constellation. I wrote Unconditional Love on one peace of paper and Full Acceptance on another one. Put one peace of paper on top of another and stand on it. Pretty incredible it what I felt went far beyond what I was expecting. I of course have meditated for a lot the year before that happened, and was going through many difference spiritual and body practices. So, I guess it has been an outcome of the previous work which happened at the right time.
I absolutely love this idea and have believe it as a possibility for many years, but all it really does is kick the can regarding the origin or reality.
So if we can reconstruct the information that has went into a black hole could we then compile a list of things that has entered into that specific black hole??
Infinite time
Infinite space
Infinite possibilities
Infinite cycles
These four infinites are my FANTASTIC FOUR .
How can the universe not be Infinite ?
If we're all made out of matter then what it all boils down to is how does matter get created from nothing ?
Answer : matter never got created because matter is Infinite with no beginning and no end which fits in perfectly with the Infinite cycles .
I can't get my head around the idea of infinity
_"matter is Infinite with no beginning and no end"_ - Energy makes matter. "making" space _makes_ time. Nothing happens in time (and _to_ time) unless matter interacts. These are guesses, and I cannot comprehend infinity either.
Infinite NONSENSE... Don't forget that one...
@@MGmirkin I could have also added Infinite BS but that would have messed up the FANTASTIC FOUR .
Thanks for your inclusion of Infinite NONSENSE anyway .
If the observable universe is indeed the inside of a super massive black hole, imagine how terrifying it is for hypothetical civilizations that still haven't been sucked into it. Watching this super massive black hole eating everything in the universe, fearing that they are next... If true, I'm grateful to have already been sucked into it.
...no. Also these hypothetic civilizations would be so advanced they would care about same random massive black hole in their universe. They will just use it to power their civilization. Just like we will likely be doing in a a few dozen billion years once all stars in the universe begin to die.
Our black hole could look quite small, given that scale would change dramatically and relative to their perspective
@@FrostbitexP yes. These hypothetic civilizations could be as advanced or as infantile as any ever has been. Both are equally possible in this hypothetic scenario.
Yes, but we again could be sucked into another black hole, and most likely we will be eventually.
I mean it makes *intuitive* sense.
A back hole being a region of space from which you cannot return, where time and space are compressed to a singularity...
... and a white hole, a region of space compressed to a singularity, from which time and space emerge and to which we cannot return.
I think that has interesting parallels with the holographic principle: when information goes into a black hole, from the perspective of those outside the black hole it is smeared across the surface. If we are inside a black hole and the universe is holographic then we experience space time as the projection of the information smeared across the surface of our containing black hole.
I love how much sense this theory makes. Just one black hole dissolving and dying no matter which "layer" its on will mean all the ones inside it die and all the ones inside that so on, infinite. and they all expand by eating each other up from the inside till the black hole they are trying to each is spread too thin because its trying to eat yet another black hole thats spread too thin.. damn.
Wow! 🤯
A big enough black hole (like the size of the universe) and the explanation makes a fair amount of sense; but so do other things we don't understand like dark matter & energy
- the dark energy would be explained by the pull of the black hole, just way WAY too big for us to see.
Great provocative video!
Then there's the why is it even existing at all? For what purpose? Who did it? So on and so on lol never ending
@@karmasutra4774 existing is its own purpose.
Dark matter and dark energy are purely speculative.
I had similar thoughts. But if all the matter of the black hole now is the stuff we see around us, then the black hole is not outside of us, we are the back hole (in as much as one of the atoms in our body is part of us). So why would there be a force pulling everything outwards?
Perhaps the gravitational attraction of all the stuff still falling into the black hole? And time is seriously weird when dealing with black holes. Meaning that we need not just consider the accretion disc that we see on the outside of a black hole in our short human time spans. It could be all of the matter yet to fall into the black hole for the lifespan of the exterior universe, for instance.
If so though, and we were at the centre of the black hole (or at least equidistant to the event horizon in all directions), the attraction from all directions would cancel itself out. If we were towards one edge, then that side would be providing a greater gravitational pull. Which we should be able to detect as there would be more expansion in that direction than the opposite.
Which is thinking in Newtonian terms of course. However the mass of stuff outside a black hole might not translate to a gravitational pull affecting stuff inside a black hole (speaking from the perspective of those of us inside anyhow) but maybe it could translate into stretching space. And if relativity puts every point inside the black hole as being equidistant from the event horizon, then things would look pretty much like we see them.
Dark matter? It could be the matter yet to fall into the black hole? With our perspective presumably being towards the earlier end of the black hole's total lifespan, with far more matter yet to fall in than has already manifested around us. Hence why there is so much more dark matter than baryonic.
The big bang being the collapse of the stellar object which formed the black hole in the first place and the dark matter being the stuff being sucked in subsequently.
Would we expect to see such matter gushing out of white holes? Maybe if we have a way of distinguishing them from the other light sources out there. Or possibly the extra matter manifesting itself around us is arriving on such a slow timescale that it might only be a few atoms scattered here and there all over the place. (Or maybe from our perspective it could take infinite time for the dark matter to arrive ... but that is harder to contemplate as a meatsack).
But as baryonic matter and dark matter can interact through gravity, a lot of the new mass being added to the universe might be concentrated around the biggest gravitational sources. Namely black holes. Hence explaining why super-massive black holes got so much bugger than our current theories predict.
Thus ends my ramble.
If you think about how inflation works, then the concept of size doesn't really matter. Our entire visible universe could fit inside of the black hole at the center of our galaxy.. Our tools of measurement would just inflate or deflate to match and we would discern no difference as humans.
Universe expansion to our eyes could be contraction of a black hole. Every black hole in every universe is smaller and smaller. That means if you go further and further backwards, the universes get bigger and bigger. To what? A possible creator? Or follow it through to the end, when will a universe no longer be large enough for even a black hole. Is that where you find divinity?
Scary but fascinating at the same time
If we are in a black hole there is another universe outside and I find that strangely comforting.
And the trillions of blackholes that our universe has...