Ces Changements Spectaculaires Qui Attendent Notre Univers

Sympa

Préparez-vous pour des potins cosmiques ! Alors, le bruit court dans la rue interstellaire que notre univers a prévu de sérieux relookings. Imaginez un peu : des galaxies qui entrent en collision, des étoiles devenant supernova – c'est comme un feuilleton céleste là-haut ! Et hé, la Terre n'est pas épargnée non plus – on parle de bouleversements majeurs dans notre voisinage cosmique. Mais ne paniquez pas tout de suite, car ces changements vont prendre leur temps, comme au ralenti cosmique. Alors regardons l'univers faire son spectacle – drame et tout le reste ! ✨  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 The emblematic rings of Saturn will disappear in less than two years.

00:04 Soon, we will no longer be able to see the great red spot of Jupiter.

00:08 The atmosphere of Pluto could disappear at any moment.

00:11 And the universe itself could be evaporating slowly.

00:14 But let me start at the beginning.

00:17 The rings of Saturn will not disappear forever, at least not in the near future.

00:21 But they will disappear from our view, that's for sure.

00:24 This phenomenon will cause the inclination of the planet in its orbit around the sun.

00:29 As a result, the spectacular rings that make up this gas giant

00:33 will become invisible to astronomy lovers as early as 2025.

00:37 This scandalous disappearance will occur because the tiny rings of Saturn will move.

00:42 It's like when you hold a sheet of paper horizontally, parallel to the ground.

00:46 You can only see its edge.

00:48 This is what is happening with the rings of this great planet.

00:52 As the seasons progress, instead of the south side of the rings tilting towards us,

00:57 we begin to see their north side.

01:00 After that, the planet tilts again and reveals once again the south side.

01:04 Such a cross of the ring plane occurs every 15 years

01:08 when our planet passes through the ring plane of the gas giant.

01:11 The last time this phenomenon occurred was in 2009.

01:15 Subsequently, the rings gradually became visible again for several months.

01:19 This time, the rings will disappear in March 2025.

01:23 Then they will reappear slowly to disappear again in November of the same year.

01:28 Shortly after, the rings will be visible again,

01:31 first through the largest telescopes, then through the whole world.

01:34 But in the distant future, these rings could cease to exist for good.

01:39 Astronomers have stated that the rings of Saturn,

01:42 which are mainly composed of ice and rocky dust

01:45 coming from pulverized asteroids, are younger than we thought.

01:49 They lose tons and tons of mass every second.

01:53 And it is likely that they will disappear completely

01:56 within a few hundred million years at most.

02:00 Let's now move on to the great red spot of Jupiter.

02:03 This huge storm could stop raging in the next 20 years.

02:07 This storm is larger than our entire planet.

02:10 It was first spotted in 1830.

02:14 But observations dating from the 1600s already mentioned the presence of a giant spot on Jupiter.

02:19 If it is the same great red spot,

02:22 we can say that the storm has been raging for centuries.

02:25 If the storm's whirlwind has remained so powerful,

02:28 it is thanks to Jupiter's jet stream,

02:30 at a speed of 400 to 600 km / h.

02:33 But like any storm, the great red spot cannot continue to blow forever.

02:38 It has been shrinking for a while.

02:40 Within a decade or two, it is expected to turn into GCR, or Great Red Circle.

02:46 And who knows, maybe it will later turn into GSM, or Great Red Memories.

02:52 At the end of the 1980s, the storm was more than 56,000 km in diameter,

02:58 four times the diameter of the Earth.

03:00 But when Voyager 2 flew over Jupiter in 1979,

03:04 the storm had already decreased its initial time by nearly twice.

03:08 And this reduction continues.

03:11 In 2017, the GCR was spreading over a little more than 16,300 km wide,

03:16 less than 1.3 times the diameter of the Earth.

03:19 Let's continue.

03:21 Pluto's atmosphere is undergoing a strange transformation.

03:25 This icy dwarf planet,

03:27 located more than 4 billion km from Earth in the region of the Quipper Belt,

03:31 attracted the attention of astronomers in 2018,

03:34 when it passed in front of a star.

03:37 With a source of such powerful light illuminating Pluto,

03:40 researchers were able to examine the dwarf planet and its atmosphere.

03:44 They came to a shocking conclusion.

03:47 Pluto's atmosphere freezes to its surface.

03:50 The planet is getting colder and colder.

03:52 Astronomers have used several telescopes,

03:55 located in different points in the United States and Mexico,

03:58 to observe Pluto and its fine atmosphere,

04:00 mainly composed of nitrogen.

04:02 This atmosphere is fueled by the pressure of ice vapor at the surface of the dwarf planet.

04:07 For about 25 years, Pluto has been moving away from the Sun.

04:11 The temperature at its surface is gradually decreasing.

04:15 Pluto is currently very far from our star.

04:19 But it will eventually get closer.

04:21 Its orbit is incredibly vast.

04:24 In addition to the great red spot of Jupiter,

04:29 the rings of Saturn and Pluto's atmosphere,

04:31 we also lose stars.

04:33 But stars do not disappear, do they?

04:35 For thousands of years,

04:37 scientists have believed that the lights in the sky were fixed and immutable.

04:41 Even after realizing that they were physical objects,

04:44 like our Sun,

04:46 they remained convinced that stars only changed

04:49 over long periods of millions,

04:51 or even billions of years.

04:53 In fact, the most massive stars,

04:56 which can be hundreds of times heavier than the Sun,

04:59 can undergo sudden catastrophic events.

05:02 For example, when they reach the end of their lives,

05:05 they consume themselves in huge explosions,

05:08 the supernovas,

05:09 which shine for months and are visible over hundreds of millions of light years.

05:14 But there are stars that seem to disappear as if by magic.

05:18 This should be impossible.

05:20 In recent years,

05:22 a group of researchers has tried to determine

05:24 if such a phenomenon could really occur.

05:26 They began to compare the data collected

05:29 over decades of observation.

05:31 The project is called VASCO

05:34 and concerns the disappearing and appearing sources

05:37 over a century of observation.

05:39 Scientists are interested in all kinds of disappearing objects.

05:42 But they hope to find a star

05:44 that has been stable and present for a long time,

05:47 then that disappeared without leaving a trace.

05:49 A star that no super-powerful telescope could detect anymore.

05:54 Our current understanding of space and its laws

05:57 suggests that stars change very slowly

06:00 over long periods of time.

06:02 Spectacular disappearances are supposed to leave visible traces.

06:06 Of course,

06:07 this does not mean that all stars must shine constantly.

06:11 The sky is filled with stars whose light changes and pulsates,

06:15 but VASCO's goal is quite different.

06:17 Researchers want to find a star

06:20 that goes from constant brightness to total disappearance.

06:23 Such a phenomenon has not yet been documented,

06:26 and such a discovery could lead to a whole new physics.

06:30 We are now going to talk about something very worrying,

06:33 namely the evaporation of the universe.

06:36 According to a famous theory proposed by Stephen Hawking,

06:39 black holes, the densest objects in the universe,

06:42 evaporate over time.

06:44 They lose their mass in the form of a strange radiation.

06:47 But a new study states that Hawking's radiation,

06:50 or something very similar,

06:52 could not be limited to black holes.

06:55 It is likely that it is present everywhere,

06:57 which could mean that the universe itself evaporates slowly in front of our eyes.

07:02 No one has ever observed Hawking's radiation,

07:06 but theories and experiments suggest that it can exist.

07:11 Let's see how it works.

07:13 It is wrong to believe that black holes are cosmic vacuum cleaners

07:16 that swallow up everything that comes too close

07:19 thanks to their immense gravitational force.

07:22 In reality, black holes have no more gravity

07:25 than any other similar mass body.

07:28 What makes them famous is their density,

07:31 incredible amounts of mass packed into a tiny space.

07:35 From a certain distance,

07:37 their gravitational attraction becomes so powerful

07:40 that it becomes impossible to escape it.

07:43 Even light is not fast enough,

07:45 and it is what we find fastest in the universe.

07:49 At the same time, any object that is massive or dense enough

07:52 can produce a serious curvature of space-time.

07:55 In other words, the immense gravitational field of these objects

07:59 makes space-time literally wrap around them.

08:03 Even if black holes are the most extreme example,

08:06 space-time also wraps around other very dense objects,

08:09 such as white dwarfs, neutron stars, and galaxy clusters.

08:14 This means that any super dense and super massive object

08:18 can produce a kind of radiation similar to Hawking's radiation.

08:22 After a very, very long period,

08:25 the whole universe could evaporate,

08:27 suffering the same fate as the old supermassive black holes.

08:31 If this hypothesis is true,

08:34 it will not only change our understanding of Hawking's radiation,

08:37 but also our vision of the universe,

08:39 of its future, and of ours.

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