L’Histoire Oubliée Des Civilisations Passées De La Terre

Sympa

Et si je vous disais qu'il pourrait y avoir eu des civilisations avancées sur Terre bien avant celles que nous connaissons ? 🌍🏛️ Certains scientifiques et historiens croient qu'il existe des preuves suggérant l'existence de sociétés incroyables qui auraient vécu il y a des dizaines de milliers — voire des millions — d'années. Des structures anciennes étranges qui semblent trop avancées pour leur époque aux artefacts mystérieux qui ne s'inscrivent pas dans nos livres d'histoire, les indices sont époustouflants. Ces civilisations perdues auraient-elles pu être anéanties par d'énormes cataclysmes, ne laissant derrière elles que des fragments de leurs histoires ? 🌋🌊 Certains pensent que les mythes de l'Atlantide et d'autres lieux légendaires pourraient en réalité être basés sur des événements réels.  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

00:00Let's suppose that another species, humanoid or delphinoid, could have existed millions of years ago.

00:07How to find its trace?

00:09In an episode of Doctor Who, it was a question of a non-human industrial civilization that had existed on Earth long before us.

00:16These reptiles, called Silurians, were forced to sink into the depths of the Earth following a catastrophic rise in temperatures.

00:25They survived for centuries.

00:27This is what prompted scientists to create the Silurian hypothesis.

00:31If there was an advanced civilization before ours, we should find traces of it somewhere.

00:37Well, let's try.

00:39The climatologist Gavin Schmidt and the astrophysicist Adam Frank decided to look into the matter.

00:45Any technologically advanced civilization is empty of energy.

00:49These scientists therefore seek global effects that would leave an important trace.

00:54For example, traces of large-scale industrial processes, such as factories and factories, and their residues.

01:01Then comes the question of the lifespan of these civilizations.

01:04If they have existed for a long time, we should look for sustainable signs,

01:09such as fossil fuel residues, massive extinctions, non-present synthetic chemical substances in nature,

01:17and even traces of nuclear fission.

01:19In fact, we should look for all the things that man leaves behind today as proof of his activities.

01:25Unfortunately, these proofs are not so easy to find.

01:29Let's imagine a worrying scenario.

01:31Humanity suddenly disappears.

01:34Even if we feel that we have brought a lot of change to our planet,

01:38a future civilization, in millions of years, would have a hard time finding traces of our existence.

01:45Why? Our planet has existed for 4 or 5 billion years.

01:50Complex life on Earth has existed for more than 400 million years.

01:54In comparison, our industrial period lasted only about 300 years,

01:58and we still have not left any significant traces.

02:01Our archives on the history of the Earth are full of gaps, especially if we go back very far.

02:07The fossil record contains only a few elements.

02:10It is very selective and incomplete.

02:12On average, a fossil appears every 10,000 years.

02:15And dinosaur footprints are even rarer.

02:18The mountains rise, the oceans change,

02:21and the tectonics of the plates can easily erase traces of entire civilizations.

02:25After a few million years, there is a good chance that any physical sign of a civilization has disappeared.

02:31To find at least something,

02:33we must look for elements such as abnormal sedimentary configurations or unusual isotopic rates.

02:40In addition, fossils are mainly formed in water,

02:43which prevents us from knowing what was the destiny of terrestrial creatures.

02:48Thus, even if a technologically advanced society existed millions of years ago,

02:53and even if it was much more advanced than ours,

02:55we would have a hard time finding clues to its activity.

02:59Frank and Schmidt tried to understand how we could hope to find traces of it.

03:04The discovery of real cities would be the ultimate proof of the existence of a Silurian-type civilization on Earth.

03:10But Adam Frank is not very optimistic.

03:13Even today, our cities represent less than 3% of the surface of the globe.

03:18It is therefore easy to pass by ruins of old cities.

03:21The survival of a city over tens of millions of years depends on the level of erosion of the land around it.

03:27It can either be trapped in the rock, or be eroded by rain and wind.

03:32Thus, places such as the French neighborhood of New Orleans

03:36are more likely to appear in geological archives than, for example, the neighborhood of Haight-Ashbury in San Francisco.

03:43As for the discovery of ancient objects, chances are also quite slim.

03:48No prehistoric iPhone would survive for millions of years, whatever its material.

03:53Finding fossilized remains is perhaps a little more likely, but it remains problematic.

03:58Given that modern man has only existed for a hundred thousand years,

04:02it is quite possible that we simply do not see the traces of an older and more advanced species.

04:08But everything is not hopeless.

04:10We could find these traces in the rocks.

04:12Our current chaotic era could leave a mark on the geological history of the Earth.

04:17Especially since we are living a PETM 2.0.

04:21I will come back to this in a moment.

04:23Researchers are therefore trying to study the changes in the carbon cycle.

04:27Since the 18th century, human activity generates a large amount of fossil carbon.

04:32It results in a particular mark in the isotopic ratio of carbon.

04:36A kind of signature that shows the difference between the carbon present in living beings, such as shells,

04:42and the carbon present in lifeless volcanic rocks.

04:45Scientists are also trying to identify clues in the arrangement of sediments.

04:50The presence of large coastal deltas may mean that artificial rivers

04:55were once dug by the inhabitants of a hypothetical civilization.

04:59Traces of nitrogen can suggest a large-scale agriculture, where a lot of fertilizers were used.

05:05Peaks of metal concentrations in the sediments could reveal the presence of rejection from heavy industry.

05:11Of course, a single discovery of this type would teach us nothing.

05:15According to Mr. Schmidt, it is necessary to look for several signs at the same time.

05:19In the absence of unquestionable artifacts,

05:21the unique character of an event can only be demonstrated by a variety of clues,

05:26and not by a series of changes related to a single cause.

05:29In their search for Silurian-type clues, scientists even decided to examine the Moon.

05:35Some astronomers are surprised that no one has ever thought about the matter.

05:39They even joked about the possibility that dinosaurs could have built rockets

05:44and left traces on the Moon or other celestial bodies.

05:47These astronomers think that planets similar to Earth tend to erase traces of civilization on their surface.

05:54They therefore explore the idea that these hypothetical beings were able to travel in space.

06:00In this case, traces of their technology, called technosignatures,

06:05could be found not only on our Moon, but also on asteroids, or even buried on Mars.

06:11There, they could last for millions, or even billions of years.

06:16Unfortunately, until now, although they have studied the past 380 million years

06:22and examined all abnormal events,

06:24researchers have not found any obvious traces of a technological civilization.

06:29But they do not give up.

06:31Frank calls on us to continue the research.

06:34For example, we could study how modern industrial chemical products

06:38are preserved in oceanic sediments.

06:41This could help us identify similar chemical traces in the history of the Earth.

06:45If there are no traces, why give so much trouble?

06:48These researches are based on the recent articles of Schmitt and Frank.

06:52They looked at the Anthropocene.

06:54This is the period dominated by human activities on Earth.

06:58It is filled with what we call hyperthermia.

07:02These are prehistoric events during which temperatures on Earth

07:06have increased strongly over a relatively short period.

07:10Some kind of extreme heat waves of the past.

07:13The maximum thermal of the Paleocene-Eocene or PETM passage is a good example.

07:20This phenomenon, which occurred about 55 million years ago,

07:25resulted in a rapid rise in global temperatures.

07:28In the space of 200,000 years, the average temperature on Earth

07:32went from about 12.8 to 10 degrees Celsius.

07:37We study these hyperthermias to understand how they occurred,

07:41whether they are due to natural causes or to human activities.

07:45And they are therefore at the origin of Frank and Schmitt's research.

07:49To study them, scientists began to examine the chemical signs

07:53and their different traces in the rocks.

07:56Doing so, Schmitt and Frank discovered strange parallels

07:59between all the current climate problems

08:02and the past periods of rapid temperature changes.

08:05There is a great similarity between PETM and other hyperthermal events.

08:11All these studies do not only aim to solve a historical mystery.

08:15Understanding our impact on the environment

08:18can help us find better ways to live in harmony with the planet

08:21and avoid disappearing as a species.

08:24Our milky way is full of planets that could be conducive to life.

08:28But we do not know if there are other civilizations.

08:31The Earth is the only place we know where living beings live.

08:35About 200 years ago,

08:37we wondered if there was no civilization on Mars.

08:41At the time, it was a real question.

08:43But once our space probes sent us photos,

08:46we found that there was no proof of the existence of an extraterrestrial civilization.

08:51And we went a little too far.

08:53Today, this question is no longer considered a serious scientific subject.

08:57It is even a little ridiculous.

08:59But no one has yet set clear limits

09:01to what could have happened on our own planet a very long time ago.

09:05Even we have no proof.

09:07We should not ignore this possibility.

09:09Let us not forget that humanity has taken time to identify the dinosaurs.

09:13The Silurians may be patiently waiting for their time.

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