Voici une pensée époustouflante : et si notre univers tout entier se trouvait en fait à l'intérieur d'un trou noir ? Certains scientifiques pensent que c'est possible, et l'idée est plutôt audacieuse. Ils disent que le Big Bang pourrait avoir été le résultat de la formation d'un trou noir dans un univers plus grand en dehors du nôtre. À l'intérieur de ce trou noir, les lois de la physique se sont étirées et déformées pour créer tout ce que nous connaissons—les étoiles, les planètes, même nous ! C'est comme une poupée russe cosmique, avec des univers à l'intérieur d'univers. Si cette théorie est vraie, elle pourrait expliquer certains des plus grands mystères sur le fonctionnement de notre univers. Animation créée par Sympa.
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Nos réseaux sociaux :
Facebook: https://www.facebook.com/sympasympacom/
Instagram: https://www.instagram.com/sympa.officiel/
Stock de fichiers (photos, vidéos et autres):
https://www.depositphotos.com
https://www.shutterstock.com
https://www.eastnews.ru
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FunTranscript
00:00Scientists are advancing a fascinating theory.
00:03What if the whole of our universe was actually inside a black hole?
00:07This concept, called black hole cosmology, suggests that the observable universe,
00:13everything around us, could be housed inside a black hole,
00:17itself located in a parent universe, or even in a multiverse.
00:21This multiverse could in turn belong to an even larger set,
00:26and so on, like a Russian doll.
00:29It seems to be science fiction, but this hypothesis is based on intriguing facts.
00:35By retracing the history of our world,
00:37scientists explain that everything would have started with a singularity.
00:41Imagine gradually reducing a gigantic sphere.
00:45At some point, it would become extremely dense before collapsing.
00:50Although it is difficult to imagine this,
00:52space allows to compress unimaginable quantities of mass into a tiny point.
00:58This point, called singularity, contains the compressed matter in an infinitely reduced space,
01:04smaller than an atom, while retaining the entirety of its mass,
01:08that of the whole universe, while occupying almost no volume.
01:12Inside this singularity, the conditions are so extreme
01:16that the classical laws of physics cease to apply.
01:18Everything we know, time, space, matter,
01:23collapses, making any process beyond this point totally incomprehensible for our current logic.
01:29Thus, scientists estimate that this was the starting point of our universe.
01:33When the Big Bang occurred, this tiny point containing everything that exists expanded,
01:39until it covered the entire space.
01:41It is from there that the universe as we know it began to form.
01:46However, according to researchers, a similar singularity would also exist at the heart of black holes.
01:52General relativity affirms that a black hole is formed when a very large object, like a star,
01:57collapses under the effect of its own weight.
02:00The more the mass is important, the more the gravity intensifies.
02:04In the case of a colossal star, tens of times more massive than our sun,
02:08this tiny point develops a phenomenal gravity.
02:12It is this force that attracts everything around it and deforms so deeply the structure of space-time
02:17that it creates the appearance of a hole in the universe.
02:20It would be the center of a black hole.
02:22A point where all these things come together and are crushed into an infinitely dense singularity.
02:28So, could our universe be a simple singularity point,
02:33nestled inside a huge black hole, itself located in another universe?
02:38It would be truly amazing.
02:40But it is not so easy to compress an object to the point of literally deforming space-time.
02:44It would take extreme pressure.
02:47If you wanted to create a small black hole on a human scale,
02:50you would have to reduce this object to the size of an atomic nucleus.
02:53To obtain a black hole the size of a chickpea,
02:56you would have to compress the entirety of our planet.
02:59But our universe is made up of 99% empty space,
03:03with billions of kilometers of void between the stars.
03:06If you grouped the entire matter of the universe,
03:08the result would be surprisingly compact.
03:11Everything around us, including galaxies, stars, planets and dust,
03:16would be held in a cube of only 1 billion light-years apart.
03:20For comparison, the Milky Way alone measures 100,000 light-years.
03:24That is to say, if the matter is rare in the universe.
03:27However, at such a density, this whole would be of an absolutely colossal mass.
03:33This mass would probably collapse into a black hole.
03:36And here is the surprising part.
03:38This black hole would have about the same size as the universe itself,
03:42with an equivalent mass and energy.
03:45In addition, it would have the same average density.
03:48The radius of a black hole increases with its mass.
03:51The more it swallows, the more it grows.
03:54But paradoxically, its density decreases as it develops.
03:58For a size as large as that of the universe,
04:01it would actually be rather clear.
04:04And this is not the only coincidence.
04:06We have a concept called the Hubble ray,
04:09or horizon of cosmological events.
04:12If we imagine our observable universe as a gigantic bubble,
04:16its edge would represent the most distant area of the universe that we can perceive.
04:20It's a bit like when you stand in a field and try to see in the distance.
04:24Your eyes describe a circle, it's the same idea.
04:27There could be more beyond this point, but it will remain a mystery forever.
04:32Beyond this horizon, the light coming from distant regions of the universe
04:36will never be able to reach our world.
04:39This is due to the limited speed of light
04:41and the too fast expansion of space between us and these regions.
04:45It's like running towards something while being pushed back,
04:48by a wind of an immeasurable force.
04:51As long as we stay on Earth,
04:53we will never be cut off from these distant borders of the universe.
04:56Black holes have something terribly similar,
04:59called the horizon of events, or the Schwarzschild ray.
05:03It is the point of no return.
05:05It is this imaginary line that is often represented
05:08in the form of luminous contours around black holes.
05:11Everything that crosses this horizon of events,
05:14falling inside, is irrevocably lost.
05:17Neither light, nor matter, nor information can get out of it.
05:21The gravity of black holes is far too powerful,
05:24which makes them perfect cosmic vacuum cleaners.
05:27As we mentioned earlier,
05:29if we created a black hole the size of the universe,
05:32it would have the same mass and the same horizon of events.
05:35Although some scientists think that this is a simple coincidence,
05:39others believe that this could be a clue
05:42suggesting that our universe is inside a black hole.
05:45This theory also suggests that our universe would not be the only one.
05:49It could exist in one of the many black holes
05:52distributed in an even larger multiverse.
05:55In this nonsensical model, each of these universes,
05:58as much ours as that of our parent world,
06:01could be the cradle of its own universe,
06:04governed by a distinct set of physical laws and structures.
06:08It would be a strange chain.
06:10There is a theory that suggests that universes
06:13could be born inside black holes, in a way.
06:16It is known as the Einstein-Cartan theory.
06:20This theory also addresses the question of singularity,
06:23but from a different angle.
06:26It suggests that, instead of condensing into an infinitely dense point,
06:30matter could generate a glass hole.
06:33The latter would be a kind of tunnel through space and time.
06:36This glass hole, also known as Einstein-Cartan bridge,
06:40could link two distinct regions of the universe.
06:43In this scenario, one side of the tunnel would correspond to the black hole,
06:46while on the other side,
06:48a whole new universe could be being formed.
06:51Thus, it could function as a teleportation.
06:54As soon as you cross the event horizon,
06:57you would be transported to this new world.
07:00But in this case, there should be a kind of opening.
07:03Some researchers have imagined this and called it a white hole.
07:07Although it does not really exist, at least to our knowledge,
07:11it could be possible somewhere on the other side.
07:15This white hole would function as the exit of a glass hole,
07:18an area where matter is constantly expelled instead of being sucked.
07:22This means that you could not throw anything there.
07:25Everything would be immediately rejected.
07:27All of this remains purely theoretical, of course.
07:30These ideas are well integrated into the Big Bounce concept.
07:33This theory suggests that, instead of our universe starting with a single Big Bang,
07:37it would have rebounded from a previous state of contraction.
07:41Do you remember the analogy of the compressed ball?
07:44Maybe there was another universe ball,
07:47compressed to a tiny size, before bouncing and expanding again.
07:52Thus, instead of a universe made of nothing,
07:55we could live in a universe that would be the cosmic recycling of another.
08:00There is also another version of this theory,
08:03sometimes called shock wave cosmology.
08:06This idea supports that the Big Bang could have been caused by an explosion
08:10inside a black hole.
08:13This would have given birth to the expanding universe we see today.
08:17As the universe expands and the density of matter decreases,
08:20the black hole could end up turning into a white hole.
08:23The opposite of a black hole,
08:25where matter is expelled instead of being sucked.
08:28But even if these connections are fascinating,
08:30they are not evidence.
08:32There is no experience or observation
08:35that could validate or invalidate these bold theories.
08:39They remain, for the moment, mere speculations.
08:42But at least, it's fun to speculate.