Avons-Nous Enfin Résolu le Mystère du Signal “Wow!” ?

Sympa

Des nouvelles observations radio d'une étoile lointaine semblable au Soleil, autrefois considérée comme la source probable du célèbre signal WOW!, n'ont révélé aucune preuve de quoi ou de qui que ce soit capable d'envoyer un tel signal. Malgré cela, les astronomes sont enthousiastes car ce "résultat nul" aide à affiner leurs techniques de recherche. Le signal WOW!, détecté en 1977, a été l'un des plus grands mystères dans la quête de vie extraterrestre. La dernière découverte est une étape cruciale dans une approche plus ciblée de l'investigation des étoiles proches, à la recherche de tout signe de ce signal énigmatique. Examinons cela et d'autres signaux mystérieux de l'Univers !  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

00:00Do you remember this mysterious signal, WOW, that intrigues astronomers for four decades?

00:06Well, get ready, because we have some captivating news on this subject.

00:11For those who may not know it, the signal WOW is a radio emission captured in 1977 by an astronomer

00:18using the Big Ear radio telescope in Ohio.

00:21This signal was so singular and intense that the astronomer had added a WOW to it

00:26in the margin of his observations, and the name has remained since.

00:30But what made the signal WOW so exceptional?

00:34First of all, it has never been detected again.

00:37Despite the many attempts of astronomers who have oriented their telescopes

00:41towards this same region of space many times, the signal has never been reproduced.

00:47As if it had acted of an ephemeral cosmic wonder.

00:50For decades, scientists have been trying to unravel the mystery of the WOW signal.

00:55Was it the message of an extraterrestrial intelligence,

00:58or was it simply a cosmic noise among so many others?

01:02A few years ago, a study suggested that the WOW signal had been caused by a comet

01:08named 266P Christensen, which crossed this same region of space in 1977.

01:15It was assumed that the hydrogen of the comet could have emitted a radio signal

01:19at the same frequency as the WOW.

01:21However, this hypothesis was quickly refuted by experts,

01:25claiming that comets do not emit such radio waves.

01:29Another theory suggested that the WOW came from a star similar to the sun.

01:34This assumption was based on the idea that the signal had a natural origin,

01:39instead of being the fact of small green men wandering in space.

01:43This star is located in the Sagittarius constellation,

01:46at a distance of 1800 light years.

01:48Although this distance may seem impressive,

01:51in the vastness of space, it is practically at our door.

01:55This star was promising, because it had interesting characteristics,

02:00similar to those of our sun, in terms of temperature, brightness and size.

02:06But alas, even after more in-depth studies,

02:10scientists could not attribute the WOW signal to this star with certainty.

02:16It is possible that other stars located in the same region have emitted this signal,

02:21but we simply cannot be sure of it.

02:24So what does this persistent enigma of the WOW signal mean for extraterrestrial life research?

02:30In truth, this means that we return to the starting point.

02:34We still do not know what caused this signal.

02:37Was it a new intelligent species or a natural phenomenon?

02:42Astronomers use several methods to detect intelligent life forms in the universe,

02:47one of them being the search for technosignatures.

02:51These are the traces of technology that we could detect from Earth,

02:55and which could indicate an advanced activity in space, otherwise impossible to explain.

03:01Among these technosignatures, we find laser emissions, radio signals,

03:06or even signs of potential megastructures.

03:10But our cosmic exploration does not stop at the WOW signal.

03:14Get ready to move and vibrate at the rhythm of the mysterious sounds produced by black holes.

03:19You may be wondering, do black holes produce sounds?

03:24Well, it seems so, and these sounds look like a real cosmic symphony.

03:30Let's start by defining what a black hole is.

03:33A region of space where gravity is so intense that nothing, not even light, can escape it.

03:40Imagine this as a giant vacuum cleaner swallowing everything in its path.

03:44Although black holes do not emit any light, they nevertheless produce vibrations.

03:49For years, scientists have been studying these vibrations, or sounds,

03:54using specialized instruments to capture their cosmic melody.

03:58So, what does the sound of a black hole look like?

04:01Imagine a bass guitar mixed with the sound of a tony truant rat.

04:05Strange, isn't it?

04:07These sounds come from the gas and dust swirling around the black holes.

04:13When these materials are sucked, they heat up and emit X-rays, detected by our instruments.

04:20These X-rays are like the notes of a song,

04:23revealing a lot of information about the processes at work inside and all around the black hole.

04:29But here is the most fascinating part.

04:31Each black hole has a unique melody.

04:34It's as if everyone had their own galactic DJ,

04:37mixing pieces so that the universe could enjoy the unison.

04:40By studying the collisions between black holes,

04:43scientists have discovered that some emitted soft and relaxing sounds,

04:47while others produced enticing and enchanting rhythms.

04:50Maybe one day we will be able to capture these cosmic rhythms and use them to power our spaceships?

04:56If we can convert sound waves into electricity on Earth,

04:59why not do the same in space?

05:03The mysterious Bloop has also intrigued scientists for a long time.

05:07But this one comes from a completely different region.

05:10The depths of our oceans.

05:13Imagine sitting quietly at home,

05:15when suddenly a loud and disturbing noise arises from your speakers.

05:19Well, that's pretty much what happened to a group of scientists in 1997

05:24when they discovered the famous sound Bloop.

05:27Now I know what you think.

05:29Bloop is not that scary.

05:32But let me tell you that this sound was anything but trivial.

05:35It was a deep, low-frequency noise

05:39that lasted about a minute

05:41and was captured by underwater microphones

05:43at a distance of about 5,000 km.

05:46Of course, scientists wondered,

05:50what could produce such a noise?

05:53Fast forward a few years,

05:55and the Internet is flooded with theories about the origin of the Bloop.

05:58Some thought it was a gigantic sea monster,

06:01while others speculated on an alien spaceship

06:05hidden in the depths of the ocean.

06:07And of course, there were also those who thought

06:10it was just a technical recording problem.

06:13Despite all these speculations,

06:15the mystery of the Bloop remained intact for years.

06:18But in 2005,

06:20researchers finally revealed the real cause of this disturbing sound.

06:24It turns out that it was simply an iceberg.

06:27When these icebergs separate from the glaciers and float in the ocean,

06:31they can produce quite strange noises.

06:34The Bloop was nothing more than an iceberg

06:37cracking as it drifted away.

06:40The fact that we now know the cause of the Bloop

06:43does not make it less fascinating.

06:45In reality, it is rather incredible

06:47that such a sound can travel thousands of kilometers

06:50and remain audible.

06:52In addition, the fact that it took years for scientists

06:55to determine its origin

06:57shows how much we still have to discover about our planet.

07:01No playlist would be complete without a sad and heartbreaking complaint.

07:05And by the way,

07:06have you heard of the loneliest whale in the world?

07:10It's a captivating story that began in 1989

07:14when American specialists were in search of submarines.

07:17Instead of submersibles,

07:19they discovered a whale with a particularly high voice,

07:22which earned it the nickname of the loneliest whale.

07:26But why do we call it that?

07:29Most blue whales emit sounds at frequencies between 10 and 40 hertz.

07:35But this whale emits a sound at a frequency of 52 hertz,

07:39which corresponds to a low note for the human ear.

07:43Its voice being different from that of other blue whales,

07:46some scientists thought

07:48that it was unable to communicate with its congeners.

07:51It is also thought that it could be a hybrid,

07:54with a parent from another species of whale.

07:57This could have affected its morphology

08:00and explained its unique voice.

08:02Recent research suggests

08:04that the loneliest whale could not be as isolated as this.

08:07Many calls for unusual whales have been detected,

08:10and some studies indicate

08:12that groups of whales living in specific regions

08:15have distinct dialects in terms of singing,

08:18which often differ in frequency.

08:21To add to the mystery,

08:23subsequent recordings have shown

08:25that the loneliest whale was modulating its melody.

08:29Its call becomes more serious over the years.

08:32Maybe it is not so lonely

08:34and has found companions to bond with.

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