00:00The astronauts have found a asteroid that makes about eight games of football.
00:05They turn so fast that they make a complete tour in less than two minutes,
00:10which makes the asteroid the fastest ever found in its category.
00:15If this guy percute the Earth, the consequences will be...
00:19Let's say everyone will see it.
00:21You can see it!
00:22The scientists have captured MN45
00:25thanks to the data of an observatory in Chile,
00:28which is a camera of 3200 Mp.
00:32He will be able to see a vast zone without 10 years
00:36to capture what is happening, what is happening,
00:38and what was not there yesterday.
00:41This super camera takes an image every 40 seconds,
00:44and it is so that she has seen MN45.
00:47The same equipment recently has captured about 2.000 other asteroids,
00:51but our hero is really out there.
00:54One asteroid turning so fast
00:56could probably not start his life
00:58like a simple spaceship spaceship.
01:00The scientists think that a collision pass
01:03has been struck quite hard to turn it like a toupie.
01:06And if the impact was quite violent,
01:09MN45 is perhaps not the asteroid of origin,
01:13but a fragment of an object parent
01:15much bigger,
01:17a piece of a monster broken by a long time.
01:21To turn it wide into space,
01:23it is not just an exploit.
01:25It is dangerous,
01:26because the rotation creates a tension
01:28which tries to dislock the asteroid.
01:31If a spaceship spaceship
01:32has not enough energy,
01:33it does not have a single block.
01:35It fragments in small pieces
01:37like a biscuit
01:38when it is too hard.
01:39It is why most of the asteroid
01:41never turns as fast.
01:43Most of them are not solid blocks.
01:45It is a space space
01:47that is a space space
01:48that is a weak gravity
01:50like a taut of a caillou
01:52flotting.
01:53The astronauts have established
01:55a sort of limit
01:56of vitesse for the asteroid.
01:58In the main structure
01:59between Mars and Jupiter,
02:02a mass of décombres
02:03should turn in more than 2,2 hours
02:06to stay intact.
02:08At the top of this speed,
02:10we enter into the danger zone.
02:11So if a asteroid
02:13turns more quickly
02:14than this limit
02:15all the rest of gros,
02:16it is a major indice.
02:17It must contain
02:18very resistant materials
02:20like a solid rock
02:21or something more dense.
02:23Because if it was fragile
02:25and friable
02:25like most of the asteroid,
02:27it would not turn.
02:28It would not turn.
02:29It would be already
02:29more than a nuage
02:30of debris.
02:31The good news is
02:33that this asteroid
02:33of roaches dures
02:34does not turn around
02:35the Earth.
02:36It is at a distance
02:37in the top of the asteroid
02:38of the asteroid.
02:39And its existence
02:40even suggests something
02:41terrifying.
02:43If an object
02:44as big and extreme
02:45has passed
02:45up to here,
02:47what could still
02:48be hidden there?
02:50Maybe the real threat
02:52is not this asteroid
02:53record,
02:54but a zone
02:55of ombre.
02:56The simulations
02:57show that a nuage
02:58of destroyers
02:59of cities could
03:00roder near Venus
03:02like the pickpockets
03:03cosmos.
03:04As their name
03:05indicates,
03:06these asteroids
03:07are quite big
03:08to destroy
03:09a whole city.
03:10If they are so difficult
03:11to repose,
03:12they are in the light
03:13of the Sun.
03:14From the Earth,
03:15the area close
03:16of the Sun
03:17is so luminous
03:18that the objects
03:19close to the orbit
03:20of Venus
03:21fall into the sky.
03:23It's like
03:24looking for a black
03:25cat in the dark
03:26while you point
03:27a torch
03:27in the eyes.
03:28And it's there
03:29that becomes personal,
03:30because humans
03:31love to pretend
03:32that they control
03:33space.
03:34But these astéroïdes
03:36hide behind Venus
03:37don't care.
03:38Their orbit
03:39can deviate
03:40slowly
03:40with the time
03:41because of gravity
03:43and one
03:44could end
03:45by crossing
03:46the trajectory
03:46of the Earth.
03:47Not today
03:49nor tomorrow
03:50but one day.
03:52And for an astéroïde,
03:54this day
03:55arrive
03:55always faster
03:56than we think.
03:58Let's now
03:59an astéroïde
04:00dangerous
04:01totally different,
04:02Venus.
04:03Venus
04:04is not a
04:04block of rock solid
04:05like M45.
04:07Venus
04:08is an amas
04:09décombres,
04:10an astéroïde
04:10geocroiseur
04:11friable
04:12of about 500 mètres
04:13wide.
04:14It is famous
04:14because the NASA
04:15has been made
04:16the mission
04:17Osiris-Rex
04:18collected
04:18and reported
04:20on Earth.
04:21And the scientists
04:22discovered
04:22at the inside
04:23was just crazy.
04:25There were
04:26elements
04:26related to life
04:27such as the ribose
04:30and glucose
04:30such as the organic
04:33and the
04:33carbon dioxide
04:34on Earth.
04:35The ribose
04:36helps to form
04:37the RNA
04:37and the
04:38the DNA
04:39and the RNA
04:40and the RNA
04:43are in some sort
04:44the manuals
04:44instruction
04:45of life.
04:46They stocked
04:46information
04:47like a
04:47disk
04:48dur
04:48stocked
04:48files.
04:49But
04:50you don't
04:51have to
04:51find
04:52these
04:52sucres
04:53on the
04:53planet.
04:55They
04:59were
05:02everywhere
05:03in the
05:04solar
05:04primitive.
05:06scientists
05:06have
05:07already found
05:08the ribose
05:08in two
05:09meteorites
05:09falling
05:10on Earth.
05:10This is
05:11fascinating
05:14and offensive.
05:15But
05:16Bennu has also
05:16a
05:16afraid.
05:18It is
05:18unlikely
05:19that
05:19there is
05:21an impact
05:22at the
05:2422
05:25century
05:26of
05:27the
05:27century
05:29as
05:29as
05:29as
05:29as
05:30as
05:30as
05:30as
05:30as
05:30as
05:30as
05:30know
05:33think
05:41that
05:41the
05:42world
05:42can
05:42take
05:42power
05:44and
05:45if
05:48you want
05:48to
05:48other examples, the space has a great astéroïdes fascinant. Prenez Cérès, first classée
05:55as a planet, then retrogradée in astéroïdes, before becoming a planet naine. We can say
06:02that she has a sacred identity. One thing is sure, it's the reine of the
06:07ceinture of astéroïdes between Mars and Jupiter. Peu import the etiquette that we
06:12give, Cérès is a boule of rock and glass of 1000 km wide. They live
06:18back to try to survive in a difficult mode. Cérès n'a pas
06:22d'atmosphère, so we need a combination to respirate and not
06:26finish congely. The day is between 93 and 33 degrees Celsius, and the
06:33night, it's at 143 degrees. But we also feel very light, because its gravity is
06:41only 3% of the Earth. A person of 68 kg would only weigh 2 there.
06:49Cérès est une planète ratée, un débris de la formation du système solaire, une
06:55protoplanète inachevée. La sonde Dawn de la NASA l'a survolée en 2015 et a vu des
07:02taches blanches comme des phares de vaisseaux spatiaux. La plus grande se
07:06trouvait au fond d'un immense cratère. Au départ, les scientifiques pensaient que
07:11c'était de la glace, mais c'est en réalité du carbonate de sodium, des résidus de sel
07:16minéraux d'une eau qui s'est totalement évaporée. Plus fou encore, cette eau salée
07:21pourrait provenir d'un immense réservoir situé à 40 km sous la surface, un système
07:27qui demeure encore actif et bouillonnant aujourd'hui.
07:30La vie semble peu probable, mais avec de l'eau, elle a pu exister par le passé. Voici tout
07:37Atis, un autre astéroïde fascinant qui a une forme étrange d'haltère à deux lobes. Au lieu de tourner
07:44rond, il culbute de façon chaotique, comme une clé à molette lancée dans le vide qui ne s'arrêterait
07:50jamais. Les scientifiques pensent que ce mouvement bizarre vient du fait que tout
07:55Atis serait composé de deux corps se touchant à peine. Cela le rend instable dès le départ,
08:01et la gravité vient ensuite aggraver les choses. En traversant le système solaire,
08:07l'attraction de la Terre ou de Jupiter le secoue, perturbant sa rotation comme des mains invisibles.
08:15C'est ce qui le rend si imprévisible. Il ne fait pas que tourner, il est sans cesse poussé vers
08:20de
08:21nouvelles trajectoires. Sa route l'amène près de la Terre, ce qui est terrifiant. Mais le plus effrayant,
08:28c'est ce côté chaotique. Son orbite est connue pour les siècles à venir, et il n'y aura pas
08:34de
08:34collision avant au moins 600 ans. Mais on ignore ce qui peut arriver après cela. Comme vous le voyez,
08:42nul besoin de craindre chaque astéroïde connu, mais on a de bonnes raisons de redouter ce qu'on n'a
08:49pas encore vu.
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