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  • 7 hours ago
L'univers adore jouer avec nos esprits, et ces énigmes cosmiques le prouvent. Du paradoxe d'Olbers, où des milliards d'étoiles laissent pourtant le ciel nocturne dans l'obscurité, au paradoxe de Fermi, qui s'interroge sur le pourquoi de notre absence de communication avec des civilisations extraterrestres malgré d'innombrables planètes habitables, le cosmos garde ses secrets. Les trous noirs vont encore plus loin, semblant violer les règles sacrées de la physique concernant l'information. Et juste au moment où l'on pense avoir compris, la tension de Hubble nous rappelle que l'univers pourrait s'étendre d'une manière que nous ne comprenons pas complètement. Dans cette vidéo, nous plongerons dans ces mystères déconcertants, explorant les failles de notre compréhension de la réalité. Accrochez-vous, car la réalité est plus étrange que la fiction, et l'espace a encore beaucoup de tours à révéler.

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Transcript
00:00You raise your eyes to the nocturne and you don't see... nothing.
00:04Well, okay.
00:05Not exactly nothing.
00:06You see stars.
00:07But not enough.
00:08If the universe is full of stars to infinity in all directions,
00:12why the sky doesn't shine so much light?
00:15This is one of many cosmic synonyms waiting for another answer.
00:19Why are black holes in the shadows?
00:22Why is the universe not able to decide on the speed of which it stands?
00:26Yes.
00:27These paradoxes have so many rules that we could say that they completely destroy reality.
00:33The universe is infinite, isn't it?
00:34There are stars and stars and even more stars without fin.
00:37But then, if it's the case,
00:39how does the sky nocturne not illuminate like Times Square during the New Year?
00:44This question is at the heart of the paradoxes of Holbers,
00:47named, according to the astronomer of the 19th century, Heinrich Holbers.
00:51He was not the first to notice the problem,
00:53but he made it famous in asking this question fondamentale.
00:56If there are stars in all directions,
00:58the whole sky doesn't need to be light?
01:01You may say, they are simply too far.
01:04But in an infinite universe,
01:05we should fall on a star in each direction where we look.
01:09And all their light should be added.
01:11So why is it dark?
01:13The answer is maybe that the universe is not infinite in time.
01:17He had a beginning.
01:18The Big Bang.
01:19That means that the light of the stars the most far away
01:22has not yet had the time to reach us.
01:25And the light that has traveled for hundreds of years,
01:27has been so tired by the expansion of the cosmos
01:30that it is now invisible to our eyes.
01:32And so,
01:33this universe of absolute light is not void.
01:36It could be filled with light.
01:38But we simply cannot see it.
01:40Maybe it is an indication.
01:42A sign that the universe has had a beginning.
01:44A story that we have not yet discovered.
01:47Well,
01:48so,
01:48the space is more sombre than it should be.
01:50But you know what is even more strange?
01:53It is also much too silencieux.
01:55You probably ask the question since you are little.
01:58The universe is immense.
01:59There are billions of stars with planets in orbit all around.
02:03And a certain number of these planets
02:04should look a little to the Earth.
02:07Which means...
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