Pourquoi Uranus roule-t-elle au lieu de tourner comme des planètes normales

Sympa

Uranus est l'excentrique du système solaire car au lieu de tourner comme une toupie, il roule sur le côté tout en orbite autour du Soleil ! 🔵✨ Les scientifiques pensent que cela s'est produit il y a des milliards d'années lorsque un objet massif—peut-être même une planète—a percuté Uranus et l'a renversé. Au lieu d'avoir un cycle régulier de jour et de nuit, chaque pôle passe 42 ans à la lumière du jour, puis 42 ans dans l'obscurité ! Cet étrange inclinaison donne également à Uranus certaines des saisons les plus bizarres de toutes les planètes. De plus, ses anneaux et ses lunes sont aussi inclinés, se déplaçant autour de lui comme un cerceau bancal.  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

00:00Uranus is an enigmatic giant that intrigues astronomers for centuries.

00:05But what distinguishes this gas giant from the others is its strange inclination.

00:10While most planets rotate around a perpendicular axis to their orbit,

00:14Uranus rotates in a different direction.

00:18But why does it look like that?

00:20How did the planet come to be lying on its side?

00:24And what would we see if we visited the surface of such a planet?

00:27Let's find out.

00:29Uranus, the seventh planet from the sun,

00:33is a cosmic strangeness and the source of many jokes.

00:36It is one of the gas giants of our solar system,

00:39with Jupiter, Saturn and Neptune.

00:42It is also the third largest planet in our solar system,

00:45with a diameter of about 49,889 km.

00:50And one of its many peculiarities is a strange rotation on the side.

00:55All the planets in our solar system are not aligned in a straight line.

00:59While most of the planets in our solar system have an axial inclination of less than 30 degrees,

01:04Uranus is inclined at an angle of almost 98 degrees.

01:09It's like this friend that must always be different,

01:12even if it means holding on to your head to prove a point.

01:17So its north and south poles are oriented east and west.

01:20It's as if the planet had become lazy and had just turned around one day,

01:25deciding to take a nap.

01:27And why is Uranus so inclined, you ask?

01:31Scientists once thought that this was due to some kind of collision.

01:35They thought that something gigantic had collided with Uranus.

01:39Something similar to what happened to our Earth.

01:43A dwarf planet hit it, the Earth tilted slightly,

01:46and the moon was born from the debris of the collision.

01:49But this theory had a problem.

01:51In the primitive universe, there were a plethora of asteroids, dwarf planets and other massive objects.

01:57And if this is the case, then why is only Uranus inclined?

02:01All kinds of objects have also hit other planets,

02:04but they do not have such characteristics.

02:09But recently, scientists published a new study.

02:13And now, scientists think that the culprit could be a lost moon that has been gone for a long time.

02:20In the past, at the beginning of the solar system,

02:23giant planets were much closer to each other and much closer to the sun.

02:28But, as we all know, facts can degenerate.

02:31Something made Uranus and Neptune migrate the furthest.

02:35As if they were trying to get away from the strict surveillance of the sun.

02:40Each giant planet had a collection of moons,

02:43but they were constantly moving during all this migratory madness.

02:48Some planets lost moons, while others gained new ones.

02:52Uranus could have been born with a massive moon, or captured one quickly.

02:57And if this moon was big enough, it could have started to play with the rotation of Uranus.

03:03This moon exerted its gravitational attraction on Uranus, further aggravating its oscillations.

03:09Over time, this made Uranus tilt more and more.

03:13Finally, it crashed on the planet, thus fixing its current inclination.

03:19Although the theory is quite solid according to the computer models,

03:23we will have to wait until at least 2030.

03:26It is at this moment that China plans to launch the space ship Tianwen 4,

03:30to examine Uranus more closely and study it more.

03:34Who knows what other crazy secrets of space we will discover next.

03:38In the meantime, we can all have fun with the lazy and rebellious planet,

03:43which seems unable to stand up straight.

03:47Such a funny and unique feature makes you wonder,

03:51what would we see exactly if we stood on this planet?

03:54How would its strange inclination affect the view from its surface?

03:59Let's see.

04:00If you were standing on the surface of Uranus,

04:03although it is not really a surface, it is more like a gaseous atmosphere,

04:07you would have an impressive view.

04:10You would see the sun rise to the east, just like on Earth,

04:13but then it would continue to travel through the sky on an inclined path, like a lazy spiral.

04:20About the sunset, however.

04:23I hope you have patience,

04:25because it would take 42 years for the sun to complete a complete circle in the sky of Uranus.

04:30It's been a long time to wait before finally going to bed.

04:36But speaking of the sky, it would be a magnificent spectacle to contemplate.

04:40Uranus is known for its amazing and unique blue-green color.

04:44This is due to the methane present in its atmosphere.

04:47Methane absorbs the red light, giving Uranus its cold hue.

04:54You would also see incredible clouds and storms swirling around the planet.

04:59But if you are looking for constellations, you are not lucky.

05:03The extreme inclination of Uranus means that its poles face the sun,

05:07so the stars would be dispersed in the sky.

05:10The constellations that are familiar to us would be unrecognizable since Uranus.

05:15In addition, as the planet rotates, the positions of the stars would change very frequently.

05:21For you, sailors out there, good luck for navigation.

05:27But you could see these beautiful moons.

05:30Uranus has 27 known moons, the largest being Titania, followed by Oberon, Umbriel, Ariel and Miranda.

05:38It is thought that these moons were formed from the same material as the one that formed Uranus.

05:44And yes, the inclination affects them too.

05:47They orbit around the planet perpendicularly to the movement of the latter around the sun.

05:52And they are not the only ones.

05:54Did you know that Uranus also has rings?

05:57Yes, Saturn is not that unique.

05:59The rings are composed of ice particles, some as small as grains of sand

06:04and others as large as several feet in diameter.

06:07They are thin, narrow and dark compared to those of Saturn, for example.

06:13They are actually so dark that they hardly reflect light.

06:18That's why it was so difficult to see them from Earth.

06:21But if you were close to the surface of Uranus, you might be able to see them in the sky.

06:27The only question is, would you be able to focus on all these views?

06:32Because Uranus was extremely cold and it will probably be the only thing you would think of.

06:40We are talking about temperatures that can go down to minus 212 degrees Celsius.

06:45Brr, it is better to wear warm clothes for this trip.

06:49This is explained by the fact that it is so far from the sun

06:52and that its atmosphere is mainly composed of hydrogen and helium.

06:57And not only Uranus is the coldest planet in our solar system, but the winters there are long.

07:04Because of the extreme inclination, these seasons last more than 20 years.

07:08It is as if the planet was stuck in a perpetual state of winter.

07:12Which is both cool, without bad puns, and at the same time a little sad.

07:20And if it's not cold enough, Uranus is also known for its violent winds.

07:24In fact, they can blow up to 579 km per hour.

07:28So you might want to hang on to something

07:32or wear a windbreaker to avoid being carried like a leaf.

07:36Finally, the magnetic field of Uranus is also inclined at an angle of 59 degrees

07:42relative to the axis of rotation of the planet.

07:45This creates interesting effects.

07:50The most obvious is the beauty of the auroras, which look like the northern and southern lights on Earth.

07:55On Uranus, however, the auroras are near the equator of the planet rather than at the poles.

08:01Isn't that incredible?

08:03The result is a dazzling luminous spectacle

08:06that would make even the most dazzled space traveler stop and observe with wonder.

08:13But, although it seems rather impressive,

08:16it makes navigation of spacecrafts around Uranus more difficult.

08:20The magnetic field creates an unbalanced gravitational attraction

08:24that can affect the trajectory of spacecrafts.

08:27This makes exploration of Uranus a little more difficult.

08:30But maybe that will change in the future.

08:33All in all, staying on Uranus would be a glacial,

08:37dizzying and breathtaking experience,

08:39and certainly not a simple walk in the park.

08:42The next time you look at the night sky,

08:45think of this magnificent frozen planet

08:47and remember that even in the vast expanse of space,

08:50there is always something new and exciting to discover.

Category

Transcript

Recommended