Il existe une grande variété d’exoplanètes, des planètes situées en dehors de notre système solaire. Il y a des mondes d’eau, des planètes de lave, des mondes en forme d’œuf, des planètes avec plusieurs soleils, et même des planètes sans soleil du tout ! Que pouvons-nous apprendre de cette étrange et merveilleuse variété ? Que nous apprend-elle sur les exoplanètes elles-mêmes et sur notre propre planète ?
Transcription de la vidéo :
[Narrator] La Terre est géniale.Ce qui serait encore plus génial, si nous trouvions une autre terre, ou un tas de terres.
C’est l’une des choses que nous recherchons à ;” data-gt-translate-attributes=”[{” attribute=””>NASA as we study exoplanets, planets outside our solar system.
But maybe searching for a planet similar to our own, where conditions might have led to an entirely unique origin of life, finally telling us that we’re not alone in the universe, maybe that’s not your thing.
That’s cool.
Maybe you’re more interested in just how weird exoplanets can be.
We think there are entire worlds covered by deep oceans, water worlds.
Not weird enough for you?
Okay. How about planets covered entirely in oceans of lava?
There are egg-shaped planets, worlds that orbit so close to their stars that they’re pulled by gravity into a lopsided shape.
And there are planets where conditions might be just right for it to rain things like glass, or even rubies and sapphires.
There are planets that orbit pairs and even groups of stars. Imagine having three or four suns in the sky!
On the opposite end of the spectrum, there are the loners, rogue planets wandering out in space with no star to call their own.
There are even planets that orbit dead stars, stars that exploded long ago and left behind a rapidly spinning core called a pulsar. Some of these pulsar planets could be among the oldest in our galaxy, pushing 13 billion years.
Such planets would have witnessed most of the history of the universe. Sadly, nearly all of it without tacos.
Now, we think that we haven’t found one yet, that there probably are exoplanets pretty similar to earth out there.
But in the meantime, there are absolutely tons of weird, wondrous worlds in our galaxy.
(jaunty music)
