¡Bienvenido a nuestra página web dedicada al apasionante mundo del documental! Sumérgete en un universo de historias reales, descubre la verdad oculta tras los hechos y explora diferentes culturas y realidades a través de nuestros documentales cuidadosamente seleccionados. #Documental
Category
😹
FunTranscript
00:00In this precise moment, on a planet far, far away,
00:29in a galaxy far, far away,
00:35in a galaxy far, far away,
00:41in a galaxy far, far away,
00:48the dawn gives rise to a new day.
00:52In a galaxy far, far away,
00:59in a galaxy far, far away,
01:05But will there be extraterrestrial eyes that can enjoy it?
01:09In a galaxy far, far away,
01:16in a galaxy far, far away,
01:22Or will it go unnoticed?
01:29Maybe it's like any other lost moment in an immense and sterile universe.
01:42We keep looking for the answer.
01:54Magnificent desolation.
01:56A wonderful view.
01:58System ready.
02:12The Milky Way.
02:26Hundreds of thousands of millions of stars.
02:29Distributed in a space of thousands of light years.
02:40Among them, the Sun.
02:49With eight planets orbiting around it.
02:56Among them, our home.
03:00Until recently, they were the only known worlds,
03:05the only planets we could explore to find signs of life outside the Earth.
03:11When I first started in astronomy, in the 1970s,
03:25we didn't know any planets beyond our solar system.
03:28We didn't have the technology to detect them, even if they did exist.
03:32Our neighborhood was the only place we could look for life.
03:38So we began our search in our closest neighborhood.
03:50In recent decades, we have launched several missions to explore the planets of our solar system.
04:02Also to some of its moons.
04:07But until now, although we continue to search,
04:10we have not found any signs of life in any of those worlds.
04:25The Earth remains something unique.
04:29The Earth remains something unique.
04:37The only planet with life in the solar system.
04:50As we continue to explore the solar system,
04:54the search for worlds beyond our domain has begun.
05:03The wonderful thing about astronomy is that as we develop better technologies
05:08and accumulate more and more knowledge about our universe,
05:12we turn more and more into worlds.
05:18For example, we've known for a long time that Mars is a planet.
05:24But tonight, beyond Mars, we see a constellation called Pegasus.
05:31This is the square of Pegasus.
05:34And we know that around there is a star called 51 Pegasi,
05:39which has a planet orbiting around it,
05:43a gas giant the size of Jupiter,
05:46which revolves every four days around that faint point of light.
05:51It is wonderful to think that throughout my adult life,
05:56in the last 25 years,
05:58we've gone from a universe in which there were no planets outside our solar system
06:04to a universe that we know is full of places where we can search for life.
06:21In the last three decades,
06:23some of the Earth's most powerful telescopes have joined the search.
06:34To the hunt for unimaginably distant planets.
06:41Hidden in the dark.
06:45Planets like 51 Pegasi b.
06:55The first world outside our solar system,
06:58detected in orbit around a star similar to the Sun.
07:1451 Pegasi b. is a gaseous giant.
07:18It is half the mass of Jupiter.
07:23But it is closer to its star.
07:30Let's imagine what that planet would be like.
07:34A world in which titanic winds scratch the sky.
07:46And inside it, a rain of sapphires is cooking.
07:5751 Pegasi b. is a giant.
08:0251 Pegasi b. is a very strange world in every way.
08:10And we will soon discover that the galaxy is full of planets
08:14that are nothing like what we have seen in our solar system.
08:26Planets enveloped by intense radiation.
08:32Planets with maltreated surfaces
08:35and swept away by the stroboscopic light of high energy
08:38that irradiates their star.
08:46Or worlds so cold that their atmosphere has frozen.
09:0251 Pegasi b. is a giant.
09:14Or large, swollen planets.
09:21With the density of polystyrene foam.
09:26And unfathomable atmospheres.
09:35These discoveries prove that, in a way, we are not alone.
09:42There are other worlds waiting to be explored.
09:56We calculate that in the Milky Way there are more planets than stars.
10:02Hundreds of thousands of millions.
10:07That means hundreds of thousands of millions of places to seek life.
10:14But there is a complication.
10:16Not all those worlds are like this one.
10:19Not much less.
10:26The first planets we found seemed too strange, too large.
10:30And often they were too close to their stars
10:33for the survival of living beings.
10:45If we wanted to find worlds in which we could explore,
10:49we would have to go to the Milky Way.
10:52If we wanted to find worlds in which life could exist,
10:56we would have to look for smaller rocky planets
10:59and in orbits farther from their stars.
11:07We needed to look for another Earth.
11:10Four. Three. Two.
11:13Ignition. One. Zero.
11:16And takeoff of the Delta II rocket with the Kepler telescope
11:20in search of planets similar to ours.
11:25The tracking was transferred to space
11:27when NASA launched the Kepler space telescope.
11:33Separation completed.
11:36In search of planets similar to Earth
11:39in the vastness of the galaxy.
11:51Kepler traveled 150 million kilometers in space
11:59until it settled in a stable orbit around the Sun.
12:06Kepler's orbit around the Sun
12:14From there it had a fixed and clear view
12:22of a very precise area of the firmament
12:25in the constellation of the swan.
12:36And it exposed its extremely sensitive photometer
12:46to the light of 150,000 stars.
12:57And it began to look for distant worlds similar to Earth.
13:05Kepler's orbit around the Sun
13:24Kepler doesn't detect planets directly.
13:27They are far too small.
13:29They are too small,
13:32and they don't emit light of their own.
13:35They only glow very faintly
13:37reflecting the ambient light of their stars.
13:43So Kepler has to detect planets indirectly.
13:46Imagine that a moth just flew across the light of the lighthouse.
13:53Now, I wouldn't see the moth,
13:55but if I had such a very sensitive detector
13:58and everything was well aligned,
14:00I would see that the intensity of the light dims.
14:04And that's how Kepler detects planets.
14:07If an alien astronomer in a distant solar system
14:10looked at our Sun with the correct alignment,
14:13he would see the trace of the Earth
14:16crossing in front of our star.
14:19He would see that the light of the Sun dims by one hundredth.
14:23It's very little, but it's enough.
14:26And if they saw that dimming was regular,
14:29and it's all done once every year,
14:32then they would infer that there is a planet
14:35orbiting around the star.
14:57Kepler's photometer is extraordinarily sensitive.
15:04But it only sees a regular darkening of pixels.
15:12Even if it's very little data.
15:19Astronomers have begun to build an image of those worlds
15:23that dim the light of the stars.
15:34Worlds that could somehow look like the monster.
15:47Worlds like Kepler-36b.
15:54This planet was one of the first discoveries of the Kepler telescope.
16:08It orbits around a star similar to ours,
16:11so at first glance it's a world that would be familiar to us.
16:16Its mass is four times the mass of the Earth.
16:20And it was one of the first of a new kind of planet.
16:25A super-Earth.
16:46Kepler's data not only allows us to say
16:49that there is a planet around that star,
16:52it also allows us to capture some of its characteristics.
16:55So by looking at the size, weight, light, phase,
16:58and the rise and fall of the light,
17:01and the time at which it dims,
17:04we can measure the orbit of the planets.
17:07And if there are multiple planets in the system,
17:10we can even estimate their masses.
17:13So astronomers can get an idea of the worlds they discover.
17:30But the more detailed our information about the Kepler-36b planet was,
17:34the less this super-Earth looked like our planet.
17:43Kepler-36b
17:48It orbits very close to its star,
17:51going around every 14 days.
18:01And it has company.
18:07A gaseous giant,
18:11that keeps an orbit exceptionally close to its own.
18:17The proximity of its mother star and its brother planet
18:21allows us to imagine the strange conditions
18:24that could be found on the surface of Kepler-36b.
18:29Kepler-36b
18:39It is possible that the planet has a synchronous rotation,
18:43so that an hemisphere would always be oriented towards the star.
18:53The scorching heat of this hemisphere
18:56would melt the ground,
19:03creating lava rivers that would cross the surface.
19:18The planet could experience violent eruptions
19:21when the gravitational pull of the gaseous giant
19:24triggers an extreme volcanism,
19:34every time it passes by.
19:54Kepler-36b
20:02But Kepler-36b could also be an ice planet.
20:16Due to the synchronous rotation,
20:19the other side would be permanently behind the star.
20:25This leads us to imagine an ice hemisphere
20:28enveloped in an eternal darkness.
20:46For now, it's all speculation.
20:50But at least we have begun to create an image of these worlds.
20:54We imagine a world in which the sun
20:57is always placed at the same point in the sky.
21:00One side of the planet would be submerged in an eternal night,
21:04and the other would live an eternal day.
21:07In fact, the twilight strip between day and night
21:11would also suffer from extreme conditions.
21:20So, Kepler-36b demonstrates that the composition of a planet
21:24is not enough for it to be habitable.
21:27You have to take into account the details of its orbit,
21:31and the nature of the other objects in the solar system
21:35that it orbits around its star.
21:49Kepler-36b
21:58Kepler-36b is just one of the thousands of planets
22:02that the Kepler telescope has discovered.
22:11We know without a doubt that in our galaxy
22:14there is a very varied collection of extrasolar worlds.
22:19Kepler-36b
22:25Each one of the more than 4,000 planets discovered so far
22:29is different from all the others.
22:32They all seem strange and exotic to us.
22:35There is certainly no planet that is identical
22:38to the planets in our solar system.
22:41This shows us a deep truth about the universe.
22:45The laws of nature that have formed the planets
22:48are simple and identical everywhere.
22:51And the fundamental ingredients of which the planets are made
22:55are also simple and identical everywhere.
22:58But the nature of a planet also depends on the history of its formation
23:02and the environment that surrounds the mother star from which it was formed.
23:07And those are all totally and absolutely different.
23:12Each planet tells us a different story.
23:15In a way, they are similar to human beings.
23:18And this wholly unexpected and exciting discovery
23:22certainly complicates the search for life.
23:32We need to limit the search for planets
23:37that are not too far from their mother stars.
23:47Planets at the right distance from their surfaces
23:50so that they are habitable.
23:57Distant worlds with a precious ingredient
24:00that makes the Earth a living planet.
24:06Planetary Science
24:23It would be logical to ask ourselves
24:26if we can apply all our knowledge of life on Earth
24:29to planets elsewhere in the universe.
24:32Well, I would say, yes, we can.
24:35Because the laws of nature are universal.
24:38The laws of physics and chemistry that sustain the biology of the Earth
24:42will affect every planet out there in the universe,
24:46whether we discover it or not.
24:56The chemistry of life is based on a few basic ingredients,
24:59carbon, nitrogen, oxygen, and iron.
25:04And it also requires a fast energy supply of good quality,
25:08coming from the heat of the interior of the planets
25:11or the light of the stars.
25:17But life on Earth depends on an extra ingredient,
25:20which is very important, liquid water.
25:23Liquid water is a deceitfully complicated substance.
25:28It's a great solvent, but inside it has structures
25:31that form and disappear constantly,
25:34structures that act as a kind of snap,
25:37around which biology develops.
25:44Organic molecules are aligned in that snap
25:47so that they can react together.
25:51Now, on Earth, all living beings need liquid water to survive,
25:55and I would say this is a very good assumption,
25:58that every living being anywhere in the universe
26:01will require it as well.
26:26In the universe, there is a lot of water.
26:31In our galaxy, large deposits have been discovered,
26:34among the gas clouds of the giant nebulae.
26:41But the abundance of water does not necessarily mean
26:44that it accumulates on planetary surfaces,
26:47forming oceans.
26:51Of the eight planets in our solar system,
26:54there is only one in which liquid water
26:57flows permanently on its surface.
27:04A marine world in which life began a long time ago.
27:11And there is no doubt that there is a lot of water
27:14on the surface of our planet.
27:20And there is no doubt that life began a long time ago.
27:39Around 4 billion years ago,
27:42life on Earth began in places very similar to this,
27:46where there is geothermal activity,
27:49a source of energy in contact with rich concentrations
27:52of reactive minerals and chemical elements.
27:56But also, and this is the fundamental,
27:59there was a magical solvent, liquid water.
28:03Now, many planets in the galaxy
28:06probably have this,
28:09but far few people would think
28:12that large masses of liquid water on the surface.
28:16So that's why in the astrobiological community
28:19the phrase is repeated,
28:22if you want to find life, look for water.
28:40As life evolved on Earth,
28:44at 124 light-years,
28:47in the collapse of a cloud of gas, dust and ice,
28:58a small star was born.
29:07The remains of this star
29:11were condensed and formed a new world.
29:24In 2015, the Kepler telescope
29:27found a planet orbiting relaxedly
29:30in the habitable zone of its star.
29:41Its mass multiplies by 8 the mass of the Earth.
29:44K2-18b is a giant.
29:58And it has a huge gravitational attraction.
30:10If the planet is rocky,
30:13that attraction would have allowed it
30:16to preserve a tense atmosphere.
30:23K2-18b has all the attributes
30:26of an aquatic world.
30:34And a legendary space telescope
30:37brought to light the new discovery of Kepler.
30:46The most powerful of the space telescopes
30:49joined the search.
30:57Hubble inspected the light of the mother star
31:00when K2-18b passed in front of it
31:04and detected what could be a weak indicator
31:07of water vapor.
31:18It is possible that we have finally found
31:21proof of the existence of water
31:24in an extrasolar world,
31:27at 124 light-years from Earth.
31:30This was the first observation
31:33of water vapor in the atmosphere
31:36of a planet orbiting the habitable zone
31:39around its star.
31:42The measurement obtained of the amount
31:45of water vapor is very imprecise.
31:48It oscillates between 0.01 and 50%.
31:51It is very far away.
31:54The important thing is to compare it
31:57The discovery is important for two reasons.
32:00First, it is not zero,
32:03in its atmosphere there is water vapor.
32:06Secondly, if the measurement is in the lower range
32:09and the percentage is low,
32:12it would be compatible with the possibility
32:15that it has oceans on its surface.
32:18At this moment,
32:21there is an intense scientific debate
32:24about the nature of this planet.
32:27It could be a small Neptune,
32:30a gaseous planet.
32:33But we can also dream
32:36of a rocky extrasolar world
32:39with blue skies,
32:42and a dark atmosphere.
32:45A rocky extrasolar world
32:48with sky full of clouds,
32:54where drops of water accumulate
32:57and precipitate,
33:04feeding huge oceans
33:09that cover the surface of a giant planet.
33:16An aquatic world.
33:26A world
33:29where the elixir of life abounds.
33:39K2-18b is exciting.
33:42It is the smallest world with atmosphere
33:45that we have analyzed.
33:48And we found that its mass,
33:51its density and its orbit
33:54are consistent with the possibility
33:57that it is a world with water.
34:00And it might be a world
34:03with oceans on its surface.
34:06We don't know for sure.
34:09K2-18b is orbiting a weak red star.
34:19The Kepler telescope
34:22continued to make many more discoveries.
34:34Until in October 2018,
34:37K2-18b was found without fuel.
34:46In its nine years of activity,
34:49it found more than 2,500 extrasolar worlds.
34:59And it showed us that planets
35:02potentially similar to Earth
35:05are very common.
35:17We estimate that in our galaxy
35:20there could be about 20 billion worlds
35:23that are potentially similar to Earth.
35:26That is, rocky planets in the habitable area
35:29around the star
35:32that is 20 billion potential homes for life.
35:47What we don't know is the probability
35:50that life could begin
35:53when the conditions are right on a planet.
35:56We only know the experience of our world.
35:59We know that life on Earth
36:02began as soon as it was possible.
36:05The oceans on the surface
36:08emerged when the Earth ended up deforming and cooled off.
36:11That is to say, although the origin of life
36:14does not seem to be inevitable,
36:17despite the fact that the conditions are right,
36:20it is reasonably likely.
36:23I think there is at least a possibility
36:26that there could be other planets similar to Earth.
36:31But I think there are two questions about life.
36:34One question is about the origin and existence of microbes.
36:37But often when we talk about aliens,
36:40we don't think about microbes,
36:43but about complex and intelligent creatures
36:46with which we could speak.
36:49We think about civilizations.
36:52What is the probability that there are other civilizations
36:55that we don't know?
36:58But there are observations that we find patterns
37:01that we also see in the Milky Way.
37:04And that marbles us to make certain conjectures.
37:25We don't know exactly
37:28how we have become such complex and intelligent creatures.
37:56But we do know for a fact
37:59that life on Earth has not been at this level
38:02since the beginning.
38:05We are the product of a history
38:08that has developed for more than a quarter
38:11of the age of the universe.
38:17From microbes
38:20to a technological civilization
38:23to a global technological civilization
38:26that wants to contact other civilizations.
38:30At least we remain surrounded by silence.
38:33The messages that we have sent to the cosmos
38:36remain unanswered.
38:39And the telescopes that we use to scan the space
38:42in search of extraterrestrial signals
38:45remain undetected.
38:48That does not mean that there are no other civilizations.
38:52But I think the answer to the question of great silence
38:55is here, on Earth.
38:58Because here it took 4 billion years of stability
39:01for a civilization to emerge.
39:04That is a vast amount of time.
39:07And when we look at the other worlds of the Milky Way
39:10we find that stability and time
39:13appear to be very rare commodities.
39:21In 2013, the European Space Agency
39:24launched the Gaia Space Telescope.
39:30Its mission?
39:33To probe the stars of our galaxy,
39:36the Milky Way.
39:39It has mapped thousands of millions of stars.
39:46Each star has a unique location
39:50Each star could be the center
39:53on which alien worlds orbit.
39:59And several patterns have already emerged.
40:02Not all the stars are alone.
40:17Some have company.
40:33And as strange as it may seem,
40:36the Gaia mission has discovered
40:39about a million binary or multiple stellar systems.
40:47We already knew about the existence
40:50of binary and multiple stellar systems.
40:53But we did not know exactly
40:56whether they were common or not.
41:00But now we have a huge amount of high-precision data,
41:03including the data from the Gaia mission,
41:06which tells us that about 50% of the stars similar to the Sun
41:09are in multiple stellar systems.
41:12And for the most massive stars,
41:15the percentage reaches 80%.
41:21And the prevalence of multiple stellar systems in the galaxy,
41:24how does it affect the possibilities
41:27of finding another Earth?
41:31Could there be planets like Earth
41:34in multiple stellar systems?
41:37And in that case, what could be its future?
41:46In 2020, we found a clue.
41:51We discovered a planet the size of Mars,
41:54moving freely through the galaxy.
41:58Let's call it a rebel planet.
42:02Now, if the planets do not form by themselves
42:05in interstellar space,
42:08where does this planet come from?
42:24The dawn.
42:33Illuminated not by one star,
42:40but by two.
42:43Maybe the rebel planet
42:46was born in a nearby binary system.
43:06Subject to the gravitational force of two stars.
43:10Perhaps its orbit was unstable.
43:21And the two stars fought to control their destiny.
43:39In the systems of a single star,
43:42the weak gravitational interactions between planets
43:45can also alter their orbits.
43:48And in a double stellar system,
43:51they are not only subjected to the gravitational force of others,
43:54but also to the attraction,
43:57even stronger than that of another star.
44:00Although a planet between two stars
44:03has a gravitational force,
44:07even if it enters a stable orbit,
44:10it is very likely that it will not remain in it for a long time.
44:13But when it comes to a double stellar system,
44:16there is a very thin line between order and chaos.
44:27Even the slightest changes in the orbit of a planet
44:30can cause drastic changes in the climate.
44:33That is why it is unlikely that the conditions
44:36of the surface of a planet in a double system
44:39remain stable for long enough
44:42for intelligent life to evolve.
44:53And sometimes,
44:56changes in the orbit of a planet
44:59may not be precisely subtle.
45:03For example,
45:06in the case of a planet between two stars,
45:09it is possible that some approach
45:12would give the rebel world
45:15the definitive gravitational kick.
45:33By launching it outside the system
45:36and freeing it
45:39from the clutches of its stars.
46:04To wander on its own.
46:12On a journey across the galaxy.
46:29Far from the heat of its stars.
46:34Any trace of liquid water it had
46:42would have frozen.
46:49And the atmosphere that protected it
46:53would freeze on the surface.
47:08The rebel planet would become like this
47:13in a world without the right conditions for life.
47:17A lonely and drifting planet.
47:28To be detected by us
47:31millions of years later.
47:34A small wandering planet
47:37similar to Earth
47:40that will wander through the darkness
47:44of space for all eternity.
47:58This lonely wandering planet
48:01is not a unique case.
48:04Although very difficult to detect,
48:07it is estimated that there are more than 100 billion of them
48:10It is possible that the rebel planets
48:13are the most common type of planet on the Milky Way.
48:16And although we think that most of them
48:19were expelled from their system shortly after their formation,
48:22it is an indicator that stellar systems
48:25are not always stable places
48:28where complex life has the possibility of evolving
48:31for billions of years.
48:41The search for another planet with life has just begun.
48:49But we have already learned a lot.
48:58We have found our first rocky worlds.
49:01Some in a habitable area
49:04around certain stars.
49:11Some with the possibility of having water
49:14in a liquid state on its surface.
49:17Candidate worlds for future missions
49:20in search of life evidence.
49:28We have also found a huge amount
49:31of strange and mistreated worlds.
49:35Orbiting around violent stars.
49:48And many rebel planets.
49:53Planets where it seems impossible
49:56to exist what we understand by complex life.
50:05Maybe we will find in those worlds
50:08the explanation why our planet,
50:11for the moment,
50:14is still an exception.
50:34Our planet has been largely free
50:37from violence, chaos,
50:40and the constant change
50:43so common in the Milky Way.
50:46We have witnessed a few massive extinctions,
50:49but the chain of life has not been interrupted
50:52at any time since 4 billion years ago.
50:55If that is what is needed
50:58for life to begin and evolve,
51:01then although there could be billions of worlds
51:04after our life began,
51:07there could be billions of worlds
51:10after our life began,
51:13but without civilizations.
51:16But that should be a basic hypothesis.
51:19And given the profound nature of the question,
51:22I believe it would be ridiculous
51:25for us to stop looking inside and outside
51:29because it is possible
51:32that we have glimpsed for the first time
51:35a world beyond the Milky Way.
51:46About 30 million light years
51:49in the spiral arms of the galaxy Remolino.
51:59There is a planet the size of Saturn.
52:09This discovery represents
52:12a progression of our horizon.
52:18The beginning of the search
52:21for extragalactic planets.
52:25I never thought I would see
52:28the discovery of a planet orbiting
52:31around a star in another galaxy.
52:34This opens up the exciting possibility
52:37of exploring not only if we are alone in our galaxy,
52:40but if we are alone in the universe.
52:47The answer to that question is so far in the future
52:50that it is possible
52:53that we will not find it.
52:56But by saying that the question of whether we are alone is profound,
52:59I mean that answering it would teach us
53:02much more about what it means to be human.
53:09With each world we explore,
53:12we become a little more human
53:15because of our ability to lay the foundations
53:18and ask ourselves questions
53:21that we can solve in life.
53:24Asking questions for our children or grandchildren
53:27is a fundamental part of what it means to be human.
53:30It is a fundamental part of what makes us so special
53:33in this little world,
53:36looking at the stars,
53:39whether we are alone or not.
53:515, 4, 3, 2,
53:54engine start, 1, lift off
53:57for the Delta 2 rocket with the Kepler telescope
54:00in search of planets similar to ours.
54:03The joint work of thousands of people
54:06has become a reality.
54:09We have worked together
54:12to create a new world
54:15where we can all come together
54:18and all come together.
54:21Separation completed.
54:24It was so emotional to see that the project
54:27in which they had worked for so many years,
54:30decades, finally go to space
54:33and all that hope and promise all come about through machinery.
54:42The Kepler telescope was an immediate success.
54:45It discovered more than 2,000 new planets
54:48in its first four years of operation.
54:55But in the summer of 2012,
54:58the team faced a challenge that threatened the entire mission.
55:05One of the fundamental elements of the Kepler
55:08are the reaction wheels that rotate
55:11and keep it focused on the objectives,
55:14the same stars without moving
55:17and the telescope has four of those wheels.
55:21It is usual that the gyroscopes of the spacecraft
55:24end up failing,
55:27but we only had a couple of them to spare.
55:32One wheel started to fail.
55:35Three months later, the second failed
55:38and since we needed three,
55:41we used the Kepler wheel.
55:44I was hoping that they would find a way
55:47to work with two gyroscopes and they did.
55:53So very clever people, engineers, scientists,
55:56they said, let's use the solar radiation
55:59as if it were the third wheel.
56:02We'll make it reflect sunlight
56:05and with the other two wheels working,
56:09the tenuous pressure of the solar wind
56:12helped stabilize the telescope.
56:15That was good news, actually.
56:18The Kepler was going to go off and we could feel other stars.
56:21That was a big boost for stellar astronomy.
56:30After four more years of discovery,
56:33they found more than 2,600 planets.
56:38It became our main planet hunter
56:41until the moment.
56:45The sending of the order of the eclipse
56:48was a very sad moment.
56:51Now it is asleep.
56:54It is in orbit around the sun and will remain in orbit.
56:57But as it was launched from Earth,
57:00the orbit will bring it back to us again.
57:03It will visit us in about 40 years
57:06because it taught us a lot about those planets.
57:09They will go up to pick it up and bring it back
57:12to display it in the Air and Space Museum
57:15so we can admire it.
57:37ESOcast is produced by ESO, the European Southern Observatory.
57:42ESO, the European Southern Observatory, is the pre-eminent intergovernmental science and technology organisation in astronomy,
57:47designing, constructing and operating the world's most advanced ground-based telescopes.