Imaginez un gigantesque astéroïde fonçant vers la Terre, tout comme celui qui a anéanti les dinosaures il y a 65 millions d'années. Survivriez-vous à un tel événement cataclysmique ? Dans cette vidéo, nous allons explorer ce qu'il faudrait pour traverser l'explosion massive, les tempêtes de feu et l'obscurité mondiale qui en suivirent. La technologie moderne et nos instincts de survie pourraient-ils nous aider à survivre plus longtemps que les dinosaures, ou serions-nous confrontés au même sort ? Préparez-vous à plonger dans un scénario d'apocalypse et à voir si vous avez ce qu'il faut pour survivre. Il est temps de découvrir si vous êtes assez résistant pour endurer l'ultime épreuve de survie ! 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
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00:0066 million years ago, dinosaurs disappeared from the surface of the earth,
00:08except for those who evolved to become birds.
00:11In an instant, the planet went from the era of dinosaurs to that of mammals.
00:15Scientists designate these periods by specific terms, the Cretaceous and the Paleogene.
00:21This cataclysmic event, on the other hand, is called the K-Pg extinction.
00:27Imagine this dramatic moment in terrestrial history,
00:30which happened in a blink of an eye.
00:32An asteroid of a colossal size, comparable to that of Mount Everest,
00:36and moving at a dizzying speed, hit the earth.
00:40It crashed into the region that we know today as the crater of Chicxulub,
00:44located in the south of Mexico.
00:48The impact was titanic, and everything that was nearby was instantly vaporized,
00:53releasing a colossal energy.
00:55It is one of the most powerful explosions that the planet has experienced in several billion years.
01:00Nothing survived on board the impact point.
01:03While the immediate effects were diminishing,
01:05the earth's surface was subject to violent upheavals.
01:08The ground began to tremble, causing earthquakes of incredible intensity.
01:12The continents themselves seemed to bounce under the impact.
01:16Then, the ocean floor agitated, generating a tsunami.
01:20The ocean floor agitated, generating a tsunami of exceptional magnitude,
01:25whose waves penetrated deeply into the lands around the Gulf of Mexico.
01:30The debris projected into the atmosphere began to fall back on the ground, like a burning rain.
01:35Even if you were away from the most imposing fragments that collapsed in Mexico,
01:40smaller pieces, but heated to white, were still floating in the air.
01:43This heated the atmosphere so much that forest fires were declared all over the globe.
01:50Dinosaurs that lived far from the impact zone first noticed a slight tremor.
01:55Very quickly, the sky darkened, plunging the planet into an artificial night in broad daylight.
02:01Temperatures dropped drastically, and this night lasted for several weeks.
02:08Little by little, a sandstorm began to cover the entire planet.
02:12Harmful substances, such as carbon dioxide and particles from the ocean floor,
02:17dispersed in the atmosphere, disturbing the temperature once again,
02:22with extreme variations in heat and cold.
02:26Nature suffered.
02:28Forest fires, the absence of sunlight and toxic gases in the atmosphere
02:32caused immense difficulties to herbivorous dinosaurs, which began to disappear.
02:37Carnivores took advantage of this to feast, but it didn't last long.
02:41Quickly, the entire food chain collapsed.
02:44It was at this moment that, according to estimates,
02:47between 50 and 80% of the species of dinosaurs disappeared permanently.
02:52What is even more striking is that this figure only reflects the diversity of species.
02:57If we consider the number of individuals who perished, the balance is even heavier.
03:02Interesting fact.
03:03If the asteroid had hit the Earth 30 seconds earlier or later,
03:07it would have landed in the Atlantic or the Pacific rather than offshore the Mexican coasts.
03:12In this scenario, it is possible that some species of dinosaurs did not come
03:16and could survive to this day.
03:18However, the impact occurred with a force equivalent to 10 billion times that of the Hiroshima bomb.
03:27The main survivors were N'Daar, our mammal ancestors.
03:30Small creatures, similar to muse spiders,
03:33with very fast energy systems,
03:36adaptable food regimes,
03:38and talent to hide.
03:40These first mammals mainly managed to survive thanks to their small size
03:44and required very little food resources.
03:47We are incredibly lucky that these mammals survived this chaos.
03:51They probably didn't understand what was going on around them,
03:54but they must have perceived the nauseating smell,
03:56the gigantic corpses,
03:58the acid rain,
03:59and the volcanic eruptions.
04:01Knowing now how devastating this event was,
04:04let's ask ourselves the question.
04:05Could we, as modern humans,
04:07survive to a catastrophe of this magnitude?
04:10The answer is complex.
04:12Research on another asteroid impact,
04:15which occurred about 790,000 years ago,
04:18suggests that this would be possible,
04:20although it is not an easy war.
04:25During this event,
04:26a massive asteroid hit the Earth again.
04:29Like the one in Chicxulub,
04:31it projected debris into the atmosphere,
04:33covering about a tenth of the Earth's surface.
04:36Scientists discovered fragments of this impact,
04:39including vitrified rocks called tektites.
04:42By analyzing them,
04:43they discovered a rare mineral,
04:45reddite,
04:46which only forms under pressure and extreme temperatures.
04:50After studying these clues,
04:52researchers hypothesized that the impact occurred in Southeast Asia,
04:56probably near Thailand.
04:58Curiously,
04:59the exact crater remains undiscovered.
05:01Nevertheless,
05:02what matters is that the collision did indeed take place,
05:05and that our ancestors lived during this tumultuous time.
05:09It is certain that this event did not happen unnoticed,
05:12even if they may not have fully grasped the extent of the situation.
05:16The debris of this collision would have led to significant climatic upheavals,
05:20and it is difficult to assess how this influenced human evolution.
05:25What we do know
05:26is that we managed to get through this ordeal.
05:30Currently,
05:31about 1,200 asteroids are listed on a potential threat list.
05:36Fortunately,
05:37we are not in immediate danger,
05:39because these asteroids are less than 1 km in diameter.
05:43The probability that a large asteroid,
05:46similar to that of Chicxulub,
05:48measuring between 5 and 15 km in diameter,
05:51will hit Earth,
05:52is extremely low.
05:53Such cataclysmic events
05:56occur once every 100 to 200 million years.
06:00In addition,
06:01the majority of asteroids are located between Mars and Jupiter,
06:04and pose no risk to our planet.
06:07However,
06:08there are thousands of small asteroids
06:10that could potentially collide with us.
06:13Most of them are so small
06:15that they consume themselves in the atmosphere without causing any damage.
06:18Some,
06:19larger ones,
06:20could damage buildings or cities,
06:22but would not pose a threat to life as a whole.
06:25But what would happen
06:27if a comet or a major asteroid hit Earth today?
06:30Such an impact could first of all change Earth's orbit.
06:34The initial energy released
06:36would cause a burning shock wave
06:38reaching 300 °C.
06:40A fire of such magnitude
06:42would burn vast regions of the Earth's surface
06:45and could have long-term consequences
06:48on the winter climate.
06:50The smoke of mega-fires,
06:52as well as dust and water vapor,
06:54would form a thick layer of clouds in the high atmosphere.
06:57As during the extinction of dinosaurs,
06:59this cover would reduce the sunlight,
07:02causing a drop in temperatures for decades.
07:05Most of the vegetation would perish in a few weeks.
07:09Large trees could survive for many years
07:12thanks to their sugar reserves
07:14and a slowed metabolism.
07:16In addition,
07:17life would be essentially reduced to microbes
07:20and the smallest creatures.
07:24To deal with this kind of situation,
07:27three strategies are conceivable for humanity.
07:30The most effective
07:31is to prevent the impact from happening in the first place.
07:34Scientists are already working
07:36to identify asteroids
07:38likely to cross the Earth's trajectory
07:41and are debating ways to defend themselves.
07:44One option is to use our most powerful weapons
07:47to fragment the asteroid into small pieces.
07:50These fragments could miss the Earth
07:52or disintegrate by entering our atmosphere,
07:55which would be effective for asteroids
07:57about 1 km in diameter.
07:59However, this method would not work
08:01for asteroids as massive as Chicxulub's.
08:04The amount of energy required to destroy them
08:07far exceeds our current arsenal.
08:09But if the asteroid is spotted early enough,
08:12a series of explosions could perhaps change its trajectory
08:15and avoid the disaster.
08:17According to researchers,
08:18asteroids over 40 km in diameter
08:21would be almost impossible to stop
08:23with our contemporary technology.
08:25Fortunately,
08:26the probability that such an asteroid hits the Earth
08:29is extremely low.
08:32If we cannot prevent the impact,
08:35the second strategy would be to take refuge underground
08:38by building large bunkers.
08:40Numerous endangered species
08:42living deep in the oceans
08:44have survived mass extinction
08:4666 million years ago.
08:48These underground habitats could thus protect us
08:50from the direct effects of the impact,
08:52such as explosions and fires,
08:54as well as winter.
08:56We could exploit the Earth's natural heat
08:58and live in protective domes
09:00built in stable continental regions
09:03or deep under the oceans.
09:05These shelters should be equipped with essential supplies
09:08such as food, medicine, fuel and water
09:11and perhaps even gene banks
09:13to preserve biodiversity.
09:15The third strategy,
09:16much less recommended,
09:18would be to do as in the film Don't Look Up.
09:20Ignore the problem until it is too late.
09:23A real solution would require
09:25the cooperation of governments and institutions
09:27from many countries to design,
09:29build and launch devices
09:31in space to prevent the impact.
09:33Succeeding in obtaining such cooperation
09:35would already be an exploit in itself.
09:37In any case,
09:38NASA takes very seriously
09:40the threat posed by asteroids.
09:42It has a complete plan
09:44including early detection,
09:46evaluation,
09:47deviation strategies,
09:49international collaboration,
09:51public communication
09:53and rescue plans to protect the Earth
09:55from these cosmic dangers.
09:56We can therefore hope that,
09:58if such an event occurs,
10:00logic and preparation will prevail.