Saviez-vous qu'il existe un « trou noir » sur Terre ? Cela ressemble à de la science-fiction, mais c’est en fait un lieu réel ! Il s'appelle le lake bouillant et il se trouve en Dominique. Ce lac est si chaud et rempli d'eau bouillonnante qu'il ressemble à un trou noir bouillant et fumant. Personne ne sait vraiment à quelle profondeur il se trouve car c’est trop dangereux pour le mesurer. C’est à la fois fascinant et terrifiant, comme tout droit sorti d’un film ! Ne vous approchez pas trop, sinon vous pourriez avoir l'impression d'être aspiré dans une autre dimension ! 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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00:00We do not necessarily realize how much the name of Uranus can be tormenting for an Anglophone.
00:06And yes, for them, it is the planet Uranus.
00:09Yet, things could have gone another way.
00:13Originally, Uranus was to bear the noble and imposing name of George, in homage to King George III,
00:19in accordance with the wishes of the astronomers.
00:22But they finally gave up this idea, and today, Uranus is often the target of mockery.
00:29If you calculate the total cost of a space mission, and you add it to the weight of its cargo,
00:34you will get dizzying figures.
00:37In 2016, according to experts, it was necessary to count $ 10,000 to ship a load of equipment into space.
00:44But now, the costs have flown away.
00:47The cost of the Cygnus ships exceeds $ 43,000 per load,
00:51while the new SpaceX capsules display a price of nearly $ 27,000.
00:57You find it excessive to pay $ 5 for a bottle of water at the airport.
01:02Imagine then that a bottle of water in space would cost between $ 9,000 and $ 43,000,
01:07and that only for its delivery.
01:11As for water in space, it was once considered an extremely rare resource.
01:17However, the reality is quite different.
01:20Water ice is found everywhere in our solar system.
01:23So it is not necessary to pay astronomical sums for a $ 43,000 bottle.
01:28This ice is hidden in comets, asteroids,
01:31and even in craters not visible on Mercury and the Moon.
01:35However, it remains uncertain that these reserves are sufficient to support human colonies.
01:40Mars, for example, recedes ice to its poles,
01:43concealed under dust and frost on the surface.
01:46Smaller celestial bodies, such as Enceladus, the moon of Saturn,
01:50and the dwarf planet Ceres, also contain ice.
01:53NASA researchers estimate that there could even be a form of life on Europe,
01:58the moon of Jupiter, because its frozen crust could well hide liquid water.
02:02Although Europe is much smaller than Earth,
02:04it could house a sufficiently vast ocean to contain twice as much water
02:08as all the Earth's oceans combined.
02:11In 2009, researchers studying a vast cloud of gas and dust at the heart of our galaxy
02:18made a most surprising discovery.
02:21They identified the presence of ethyl formate in this cloud.
02:25This chemical molecule is at the origin of the pleasant flavor of raspberries
02:29and releases a perfume reminiscent of that of rum.
02:32In addition, a neighboring region is full of ethanol,
02:35the same substance found in alcoholic beverages.
02:38In fact, there would be enough alcohol in this region
02:41to offer every inhabitant of the Earth 300,000 pints of beer a day.
02:46And this, for the next billion years.
02:50As surprising as it may seem,
02:52there is indeed a black hole on Earth.
02:55Indeed, the creation of a black hole in a laboratory
02:58proved to be an essential step.
03:00The observation of black holes in real space being still out of reach,
03:04it was only possible to study them by artificially recreating them
03:07in controlled environments.
03:09A group of Dutch scientists began to explore the mysterious theory
03:13of Hawking's radiation, developed by the famous physicist of the same name.
03:17By using atoms to simulate a horizon of events,
03:20they manipulated electrons,
03:22which led to a rise in temperature, evoking a flat space.
03:26As the particles crossed quantum fluctuations,
03:29an infrared radiation ring formed around the black hole created in the laboratory,
03:34thus partially confirming Hawking's predictions.
03:38It may seem incredible,
03:40but it is quite possible to be allergic to the Moon.
03:43To sum up, during the last Apollo mission,
03:46the astronauts brought back a record number of rock samples.
03:49In addition, for the first time, a professional scientist,
03:52the geologist Jack Schmidt, was part of the team.
03:55Thanks to these samples,
03:57the researchers were able to deepen their knowledge
03:59about the magnetic field of the Moon and its volcanic past.
04:02During the expedition,
04:04it appeared that Jack Schmidt was allergic to lunar dust.
04:08This fine and abrasive powder
04:10stuck to his equipment and his skin,
04:13causing irritation to his sinuses,
04:15his nose,
04:16his eyes,
04:17and his throat for several hours
04:19after he took off his helmet.
04:24Neutron stars have a prodigious density,
04:27which is essentially a cluster of neutrons
04:29compressed in an extremely small space.
04:32If you could take a teaspoon of it,
04:34this matter would weigh more
04:36than the entire world population combined.
04:38To equal the density of a neutron star,
04:41we would all have to be compressed
04:43in a space as tiny as a piece of sugar.
04:45Uh, no thank you.
04:49When it comes to space,
04:51we often tend to believe that Earth and the Moon are very close.
04:54However, in reality,
04:56it would be possible to intersperse
04:58all the other planets of our solar system with each other.
05:01The average distance that separates them
05:03is about 384,000 km.
05:05Even by adding the diameters of the seven planets,
05:08there would still be a little free space,
05:10or about 8,000 km.
05:14In 2011, scientists
05:16made a revolutionary discovery
05:18by identifying a huge reservoir of water in space.
05:21This volume of water,
05:23equivalent to 140 billion times
05:25that of all terrestrial oceans,
05:27would be enough to provide each person on Earth
05:29with the equivalent of water
05:31contained on a planet, multiplied by 20,000.
05:33This reservoir was located
05:35near a massive black hole
05:37known as Quasar,
05:39which drew matter while emitting energy.
05:41This water was formed by energetic waves
05:43that caused the collision
05:45between hydrogen and oxygen atoms
05:47and is about 12 billion light years away from us.
05:52When the Curiosity rover
05:54immortalized its first sunset on Mars in 2015,
05:57the excitement of the scientists was palpable.
05:59Contrary to what one might imagine,
06:01the sunsets on the red planet
06:03are not tinted with red,
06:05but a striking blue.
06:07According to NASA, this color
06:09is the result of how Martian dust
06:11acts as a natural filter,
06:13allowing blue light to pass through
06:15while blocking warmer tones,
06:17such as yellow, orange and red.
06:21Venus rotates much slower than Earth.
06:23It takes it 243 days
06:25to complete a complete rotation on itself
06:27and its rotation is done
06:29in the opposite direction of that of our planet.
06:31Despite this slowness,
06:33Venus loops its orbit around the sun
06:35in only 225 days,
06:37because of its proximity to it.
06:39Thus, as surprising as it may seem,
06:41a year on Venus
06:43is actually shorter than a day.
06:49It is easy to believe
06:51that the night sky should be
06:53completely dark.
06:55This idea is known as
06:57the Olbers Paradox,
06:59in homage to the German astronomer
07:01Heinrich Wilhelm Olbers.
07:03He thought that if the universe
07:05was infinite, immutable and eternal,
07:07we should actually see stars
07:09in all directions where our eyes are.
07:11However, it turns out
07:13that the universe is neither infinite,
07:15nor immutable, nor timeless.
07:17It was Edwin Hubble
07:19who discovered that the universe
07:21and the Big Bang's fossil radiation
07:23reveal to us that the universe
07:25is about 13.8 billion years old.
07:27Imagine for a moment
07:29all the birthday candles.
07:31The reason why we do not see stars
07:33in all directions is simple.
07:35Some of them are too far away
07:37or have not existed long enough
07:39for their light to reach us.
07:43During the Apollo 16 lunar mission,
07:45Ken Mattingly, the pilot
07:47of the command module,
07:49was in shock when he realized
07:51that his Alliance had disappeared.
07:53The crew looked desperately
07:55for it in the entire spaceship,
07:57without success.
07:59It was only on the 9th day,
08:01when Mattingly made
08:03an extravehicular exit,
08:05that the ring was seen
08:07floating near the shell.
08:09Charles Duke tried to catch it,
08:11but missed it.
08:13Luckily, it bounced
08:15on Mattingly's helmet
08:17including a toothbrush
08:19floating somewhere.
08:23Mercury,
08:25already the smallest planet
08:27in our solar system,
08:29is also the second densest
08:31after Earth.
08:33It shrinks and becomes
08:35even denser.
08:37For a long time, scientists thought
08:39that Earth was the only planet
08:41with a tectonic activity.
08:43But everything changed
08:45with the discovery of
08:47Mercury,
08:49which gave us a detailed
08:51survey of the planet.
08:53In 2016,
08:55MESSENGER discovered
08:57formations in the shape
08:59of cliffs,
09:01called cracks.
09:03As they are still relatively
09:05small, scientists estimate
09:07that they are recent,
09:09suggesting that Mercury
09:11would continue to contract
09:13with other planets.
09:15The Italian, Luca Parmitano,
09:17was drowned during a spacewalk
09:19because of an unresolved
09:21water leak.
09:23Nobody understood how
09:25water could have penetrated
09:27his helmet.
09:29NASA conducted an investigation
09:31that lasted several months
09:33without being able to identify
09:35the exact cause of this infiltration.