Deux Trous Noirs Entrent en Collision — La Terre Ressentira-t-Elle les Secousses ? - video Dailymotion

Sympa

Avez-vous entendu parler de l'imminente confrontation cosmique entre trous noirs ? Ça semble tout droit sorti d'un film de science-fiction, mais c'est bel et bien réel ! Deux trous noirs sont en route pour une collision, et lorsqu'ils fusionneront enfin, cela créera un événement cosmique massif, libérant des quantités incroyables d'énergie. Vous pourriez vous demander si la Terre ressentira des effets de cet événement colossal, mais ne vous inquiétez pas—nous sommes complètement en sécurité. Ces trous noirs sont tellement éloignés que leur collision n'aura aucun impact sur nous, autre que de donner aux astronomes quelque chose de vraiment excitant à étudier.  Animation créée par Sympa. ---------------------------------------------------------------------------------------- Musique par Epidemic Sound https://www.epidemicsound.com   Pour ne rien perdre de Sympa, abonnez-vous!: https://goo.gl/6E4Xna​ ---------------------------------------------------------------------------------------- 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 ----------------------------------------------------------------------------------------  Si tu en veux encore plus, fais un tour ici:  http://sympa-sympa.com

Transcript

00:00 Open your ears wide, something is about to happen that could shake everything we have never thought we knew about space and time.

00:08 You've heard of black holes, haven't you? These dense phenomena beyond the imaginable that are generally found at the heart of galaxies.

00:16 Two of them, located 9 billion light years from Earth, should collide. And oh la la, who would like to be present to witness this?

00:25 Let's be clear, black holes are the most powerful objects in the entire universe, at least to our knowledge.

00:31 If they suddenly decided to run mechanics, we would all be condemned.

00:36 A black hole was once a huge star that imploded into a supernova, which means that the star collapsed on itself, and that the immense energy released created a black hole in its place.

00:48 By the way, black holes do not suck objects like vacuum cleaners. It's a widespread myth. If we replaced our sun with a black hole in the center of the solar system, not much would change.

01:00 Except that we would all probably freeze. But black holes can do something much worse than sucking objects.

01:06 They could destroy the universe itself. If a black hole followed the usual chronology, it would go from its creation to its total disappearance.

01:15 But this process is extremely slow. We are talking about billions and billions of years before a black hole loses all of its mass.

01:23 This happens because they lose it constantly, every second that passes. Black holes eject this mass by radiation, just like a kettle in boiling water loses its water in the form of steam.

01:35 Yet, things rarely go as planned, both in our lives and in the universe itself, apparently.

01:42 It would not be a surprising war to discover that two black holes are about to collapse.

01:47 This is what scientists have recently discovered. And let's just say that this is one of the reasons why the scientific community has a few cold sweats.

01:56 The first question that comes to mind is, what does this mean for us humans? A total annihilation?

02:02 Let's not be so dramatic. In the best case, we could live an experience worthy of Interstellar. Personally, I would not say no.

02:10 Let's go back a little bit to understand how this could happen.

02:14 45 years ago, a group of scientists began to observe a strange behavior coming from a very, very distant galaxy.

02:22 This galaxy is 9 billion light-years away, and its scientific name is very complicated. SDSS J430 + 2303. We will also simply call it the "very distant galaxy".

02:37 One might wonder, how did the scientists manage to observe this black hole so far away, if it does not emit any light?

02:44 Good question. It is because the black holes accumulate gas disks around them, and they reject some of this matter into space.

02:52 These jets can be detected at distances of several million light-years.

02:56 If these hot gas jets are directed towards space, then the scientists give these black holes a special name.

03:03 The "Blazar" one. A blazar in particular has recently captured our attention. The PKS 2131-021. Another name to be given. We will also simply call it "IGOR".

03:16 Imagine that you are a scientist from Caltech, observing a blazar through your radio telescope, and that you notice its strange behavior.

03:24 Its luminosity seems to fluctuate, like the tic-tac of a clock.

03:28 At first, you do not understand what is happening over there, in this remote corner of the galaxy, but then, you realize that there must be another black hole, which revolves around the first.

03:38 In other words, scientists have discovered that IGOR orbits around another blazar. Gritschka.

03:44 And the regularity of this feeling can only mean one thing. They are close to collision. And that only makes it worse.

03:50 It is estimated that each of the two blazars has a mass equivalent to several hundred million times that of our sun.

03:57 Do you see our sun? It is colossal. 33,33 thousand times more massive than the Earth.

04:03 This means that we are facing something that goes beyond understanding.

04:07 This is not the first time that scientists have detected such a phenomenon.

04:11 In September 2015, the LIGO observatory detected a collision between two black holes.

04:17 Each of them was as large as 30 suns, and the equivalent of three solar masses was released during the impact.

04:24 And guess what? This gravitational wave crossed the Earth at the speed of light, but without really affecting us.

04:30 Maybe you were sleeping and had briefly felt something strange. But nothing significant happened on our planet.

04:37 It is because this explosion was relatively weak.

04:40 The truth is that the collision planned between IGOR and Gritschka will generate unprecedented gravitational waves across the galaxies.

04:48 And they will reach our solar system. But what is this shock wave really capable of?

04:53 It could prevent our sun from releasing gas for a few minutes, which means that it would stop heating the solar system.

05:00 Imagine that you are having a summer day, and suddenly, the atmosphere freezes for a few seconds.

05:07 It doesn't seem very pleasant, does it? But this possibility is actually less worrying than the next one.

05:14 In one of the most catastrophic scenarios, the explosion resulting from the collision between IGOR and Gritschka

05:20 could break the bonds that bind the atoms and disintegrate everything.

05:24 You, me, your cat. We would all turn into small particles floating in space.

05:30 It may seem terrifying, but scientists say that an atom is made up of 99% of empty space.

05:38 This means that the whole world on Earth, our 8 billion human beings, as well as all plants, objects and animals, are 99% empty.

05:47 So maybe all that IGOR and Gritschka would accomplish is to desolidarize all our atoms.

05:52 In addition, the explosion could disrupt the very fabric of space-time as we know it.

05:58 You remember Albert Einstein, don't you? With the hair and the mustache?

06:02 He formulated the theory of relativity. He discovered that time was relative and always depended on the observer.

06:10 This means that time would not be identical everywhere in the universe. But why?

06:15 Because Einstein's theory of relativity is also a theory of gravity.

06:19 Einstein discovered that gravity represented the effect that objects exerted on the fabric of space-time.

06:25 Each object possessing a mass, including you, me, your cat and our planet,

06:30 creates a distortion or deformation in the fabric of space-time that makes it bend.

06:35 The larger this mass, the greater the gravitational force and the more distorted the fabric is.

06:41 It may seem complicated, but it is what creates different perceptions of space and time across the cosmos.

06:47 That's why you would age differently on Earth and on Jupiter.

06:51 It is also the reason why time flows very differently for cosmonauts on long space missions compared to people on Earth.

06:59 A collision between two megablazars could thus disrupt our perception of space and time

07:04 due to the immense force of these gravitational shock waves.

07:08 Not to mention the fact that black holes already represent a considerable distortion in the fabric of space-time.

07:14 You remember this scene in Interstellar, don't you?

07:17 Where the main character bends the continuum of space-time through a black hole.

07:22 Don't try this at home, however.

07:24 As far as we know, anyone who decides to enter a black hole would have no guarantee of ever being able to return home.

07:32 Scientists estimate that this blazar explosion will occur in about a thousand years.

07:37 But wait a minute.

07:38 If it is 9 billion years away from the Earth,

07:41 it means that these two black holes should have already collided long before the birth of our solar system and our planet.

07:49 You see, the solar system was born about 4 billion years ago.

07:53 And since it takes us 9 billion years to receive the light emitted by the blazars in the first place,

07:58 it means that the collision of the two blazars has already occurred and that its effects will reach the Earth in a thousand years.

08:03 This means that the shock waves are already crossing the galaxies at this very moment.

08:07 But it is not even something that your rear rear rear rear rear grandchildren can witness.

08:14 (upbeat music)

Deux Trous Noirs Entrent en Collision — La Terre Ressentira-t-Elle les Secousses ?

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