Ces Événements Naturels Extrêmes Qui Pourraient Détruire Notre Planète

Sympa

Il existe plusieurs événements naturels extrêmes qui pourraient potentiellement mettre fin à la vie sur Terre. Un impact massif d'astéroïde, comme celui qui a exterminé les dinosaures, pourrait causer des dégâts catastrophiques. Les éruptions de supervolcans, bien plus importantes que les éruptions volcaniques ordinaires, pourraient éjecter assez de cendres et de gaz dans l'atmosphère pour bloquer le soleil et déclencher un hiver global. Une explosion de rayons gamma provenant d'une étoile proche pourrait bombarder la Terre de radiations mortelles. Enfin, un changement significatif dans le climat de la Terre, au-delà de tout ce que nous avons observé, pourrait rendre la planète inhabitable pour la plupart des formes de vie.  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 Living on our beautiful planet may seem safe,

00:03 but only until you start thinking about everything that lurks in the corners of the street

00:08 or in the vast darkness of the cosmos.

00:11 Let's see what could lead to the end of planet Earth.

00:14 Each new potential threat is more terrifying than the previous one.

00:18 I warned you.

00:20 First of all, let's talk about hypercyclones.

00:23 This natural disaster can become really extreme.

00:27 A hypercyclone is a theoretical hurricane of unequal power.

00:31 It would occur if the ocean was overheated due to climate change.

00:36 A massive volcanic eruption could also be the cause.

00:40 In any case, the hurricane created, unlike the usual hurricanes,

00:44 would extend well beyond the low stratosphere.

00:47 The speed of such a storm would reach 800 km/h.

00:51 The pressure inside the hypercyclone would be very low

00:55 and consequently, it would last longer than a normal hurricane.

00:58 It could even last for weeks.

01:00 But the worst, it would damage or even destroy part of the ozone layer

01:05 and the hole resulting from it would be the size of the entire North American continent.

01:10 Then, there are super destructive tornadoes.

01:13 A tornado is a column of air in violent rotation.

01:16 It usually spreads from a storm and is in contact with the ground.

01:21 Inside a storm cloud, hot and humid air rises and cool air falls with rain or hail.

01:28 These conditions can cause the appearance of air currents in rotation inside the cloud.

01:33 It is interesting to note that these air currents are first horizontal,

01:37 but at some point, they can become vertical again and start to descend,

01:41 thus transforming into tornadoes.

01:43 Some tornadoes are narrow whirlwinds like ropes.

01:47 Others are large funnels.

01:50 Tornadoes are classified by the improved scale of Fujita.

01:53 A weak tornado usually lasts a few minutes and does not move at more than 160 km/h.

01:59 The next level is a strong tornado.

02:02 These whirlwinds can last about 20 minutes and their winds can reach 320 km/h.

02:08 Finally, violent tornadoes can last more than an hour and move at a speed between 320 and 480 km/h.

02:18 On average, a thousand tornadoes occur each year in the United States.

02:23 There is even a region called "Tornado Alley",

02:26 an area that extends over a dozen states in the Midwest.

02:29 But tornadoes can occur in any state.

02:32 One of the most destructive natural disasters was the tornado of the three states in the United States.

02:38 It lasted an endless time and traveled 354 km through Missouri, Illinois and Indiana.

02:46 The average trajectory of a tornado usually does not exceed 8 km.

02:50 But what would happen if one day a much larger and much more powerful tornado

02:55 than all the ones we have known so far crossed countries and continents?

03:00 It would devastate everything in its path.

03:03 And what about supercellular storms?

03:06 It is the least common type of storm, but the most dangerous.

03:09 It is likely to cause violent meteorological phenomena,

03:13 destructive winds, very large hail and even powerful tornadoes.

03:17 What makes supercellular storms unique is the presence of a deep and persistent ascending current called mesocyclone.

03:25 Supercellular storms can last hours and cause considerable damage.

03:30 The impact of an asteroid could also end any form of life on Earth.

03:35 If one of these space vagabonds was big enough,

03:39 it could cause widespread devastation.

03:42 As was the case with the 13 km wide asteroid that appeared 66 million years ago.

03:47 It is said that it destroyed three quarters of the planet's plant and animal species, including dinosaurs.

03:54 Depending on the size of the asteroid and its approach speed,

03:58 the impact could cause large-scale fires, tsunamis and create an "eternal winter".

04:04 This occurs when the debris ejected into the atmosphere blocks the sunlight and disturbs the global climate.

04:11 Fortunately, thanks to our technology, we would probably notice an asteroid of this size

04:17 approaching our planet long before the collision, and we would have enough time to get rid of it.

04:23 It may be our own sun that will put an end to our world.

04:29 Our star is a gigantic ball of gas in fusion, in constant evolution.

04:34 From time to time, it spits energy bubbles, solar eruptions.

04:39 They often go hand in hand with what we call coronal mass ejections.

04:44 These are giant ionized gas bubbles that can reach incredible speeds.

04:49 The most powerful volcanic eruptions are not the same as solar eruptions,

04:54 which release 10 million times more energy.

04:57 In a few minutes, a solar eruption can emit billions of tons of charged particles.

05:02 Solar eruptions are also extremely hot, with temperatures reaching several million degrees.

05:08 Astronomers think that these solar radiation explosions occur when the magnetic field of the sun deforms in certain regions.

05:16 At some point, all the reflected energy is released.

05:20 The star emits light and particles, mainly electrons and protons.

05:25 Most solar eruptions last a few minutes, but some last hours.

05:30 Scientists classify solar eruptions according to their luminosity in x-rays.

05:37 You probably won't notice the smallest eruptions if you don't have special equipment.

05:42 Medium solar eruptions cause short-circuits in the pole, but nothing serious.

05:47 Class X eruptions should worry you.

05:50 They cause the strongest and most durable solar storms.

05:54 If you could see gamma rays, you would see flashes of extreme luminosity.

05:59 They occur every day, eclipse everything around you, then disappear again.

06:04 They are called gamma bursts.

06:07 Only one of them could destroy the Earth's atmosphere.

06:10 The flare that could destroy our planet would most likely be born in a distant galaxy,

06:14 during the fusion of two stars that are collapsing.

06:17 It would be immensely powerful and superluminous.

06:20 Even a thousand years from now, it would shine as much as the sun.

06:25 The atmosphere of our planet would try to protect us, but this natural shield would be quickly destroyed.

06:31 This radiation would be so powerful that it would literally burn the atmosphere.

06:35 Its nitrogen oxides would destroy the ozone layer.

06:38 Without this layer, the ultraviolet rays from the sun would hit the surface of the Earth with full force.

06:44 They would destroy the entire tiny plankton of the ocean.

06:47 However, this plankton produces 50 to 70% of all the oxygen on the planet.

06:52 Their disappearance would therefore lead to a serious oxygen shortage,

06:55 which would lead to the disappearance of life on the planet.

06:58 Finally, the heat and ultraviolet light from the sun would turn the planet into a huge ball of rock.

07:05 What if we fell into a black hole?

07:08 You may know that a black hole is a region of space where gravity is so strong that even light cannot escape.

07:13 Luckily, the closest black hole to us is 1,500 light years away.

07:18 So we didn't really worry about it until we learned about the existence of black holes.

07:25 Then, things started to get really scary.

07:28 If such a black hole entered our solar system, the Earth would be doomed.

07:32 We would have no chance against this monster of space.

07:35 In 2020, 13 black holes were spotted not far from our planet.

07:40 But "not very far" in terms of space means about 1 billion light years.

07:45 So we have a little time left.

07:47 The possibility of such a disaster is very, very low.

07:51 One day, a wandering planet could push the Earth out of the habitable zone and place it on an extreme orbit, further away from the sun.

07:59 The climate of the planet would then begin to get colder and colder.

08:03 Remember that the further our planet is away from the sun, the less gravitational attraction of the star on our planet.

08:10 In the end, our beautiful Earth would move too far from its main source of light and heat.

08:16 It would turn into a piece of lifeless rock, covered with a thick layer of ice.

08:22 Or the sun could expand and turn into a red giant.

08:27 If this happened, the entire habitable zone of the solar system would be modified.

08:32 The disaster would begin when our star would run out of hydrogen.

08:36 This would trigger a chain reaction that would eventually lead to warming and the densification of the heart of the sun.

08:43 As a result, our beautiful star would become much larger than it is now.

08:48 During this transformation, it would swallow Venus, Mercury and Earth.

08:53 [MUSIC PLAYING]

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