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Ah, we have visitors.

Welcome to the International Space Station
in the year 2057.

I'm Matt Saberneck, and I'm talking to you
from the not-too-distant future

to give you a better insight
into the workings of our solar system.

As you probably know, even in your time,

mankind has undertaken numerous unmanned
missions to our neighbouring planets.

We've even succeeded in landing
a remote-controlled vehicle on Mars,

and these took photos
of their surroundings,

photos just like the ones you would take
outside your front door.

Looking at real snapshots
from faraway worlds is pretty exciting,

and I have good news for you.

In my time, our advanced NOMAD rovers
are out there everywhere,

stationed throughout our solar system
and beyond.

So let me take you on a little tour
to have a closer look

at the eight major planets
of our solar system,

their biggest moons,

and of course some of the most
breathtaking views

our galaxy has to offer.

And while we're at it,

we'll look for extraterrestrial life,
of course,

a possibility which has fuelled
mankind's imagination for centuries.

The question of how our Earth,
and even our Sun, were created originally,

and developed into their current forms
will also be answered along the ride.

The main focus of our mission
is the planets of our solar system:

Mercury, Venus, Earth, Mars, Jupiter,
Saturn, Uranus and Neptune.

First of all, you may wonder where these
planets have come from originally.

They haven't been there forever;
they emerged billions of years ago.

We cannot look into this distant past,

but in the almost infinite depths of space
that surrounds us,

new suns and planets
are born virtually all the time.

Nebulae like this one
are interstellar clouds of dust and gas.

The area we're looking at
is spread over 200 light years.

That means,
if we could travel at the speed of light,

it would take us 200 years to travel

from the left border of the screen
to the right.

The "star dust" consists of crystals,
amorphous substances and molecular chains.

When this diverse matter is exposed
to massive pressure,

a chain reaction is set into motion

that leads to the creation
of new suns and planets.

In this case here,
the gigantic star Eta Carinae,

is the father of numerous baby stars,
in a manner of speaking.

Eta Carinae has a mass a hundred times
greater than our sun.

It's so big,
it can hardly keep itself together.

Some experts believe that Eta Carinae
could even explode within a hundred years.

Hardly a bat of an eye
when thinking in cosmic timelines.

Here we have the "Southern Pillars"
of the Carina Nebula.

The dust clouds here are so dense,
that no light can pass through,

but with our infrared cameras
depicting heat sources,

we can lift that veil
and have a look inside.

Now, the future baby stars
are visible as yellow or white dots.

They are cocooned in finger-like tubes,
shown in pink.

The star Eta Carinae is just outside
the top of the frame.

Like all suns, it doesn't only emit light,

but also strong radiation
and energy-charged particles.

These "stellar winds" have blown
the stardust in front of them,

and chaotic shapes of veins
and pillars have formed.

Over a time period of millions of years,
new solar systems will develop here.

Just like our own sun,

most of these small, bright dots will have
their own planets that circle around them.

But as long as mankind hasn't developed
any hyper-lightspeed drives,

we better have a closer look
at our neighbouring planets instead.

Let's start with Mars.

As you probably know,

the Red Planet has been the destination
of a handful of artificial visitors:

probes, landers and rovers.

Even the early models were equipped
with digital cameras,

some even capable of creating
three-dimensional images.

That way, mankind became witness

to the wide plains
and rugged chasms of Mars.

With the current technology, this whole
experience gets even more impressive.

Mars is a rocky body, just like Earth.

But it's only half the diameter
of our home planet,

which makes it the second smallest planet
of our solar system.

Its red colour comes from vast amounts
of iron oxide, also known as rust,

that is spread throughout the planet
and the atmosphere.

Speaking of which, the atmosphere
is rather thin, as opposed to Earth.

This results in Mars not being able
to store much of the Sun's warmth.

Near the equator, temperatures are around
32 degrees Fahrenheit during daytime.

At night, it plummets to as cold
as minus 121.

If you're looking to camp here,
you should definitely pack warm clothes.

The air on Mars is very dusty
and is mainly made of carbon dioxide,

so humans cannot breathe here.

Also the high pressure
would make your skin boil,

so better bring a spacesuit.

Aside from these facts,

Mars would surely be an interesting
holiday destination.

After all, it's got varying weather
conditions and seasons,

just like back on Earth.

The southern hemisphere of Mars
is generally warmer

than the northern counterpart.

Between them, temperatures can vary
as much as 80 degrees.

In summer,
the pole caps made of ice melt down,

which allows for distinctive
cirrus clouds to form.

We can actually see these in the sky here.

In spring, storms are common,

which whip up vast quantities
of Martian dust.

With wind speeds
of up to 400 miles an hour,

a lot of the surface
is cast under a dusty veil.

Sometimes, even small cyclones
called Dust Devils come up.

The extensive landscapes on Mars
have quite a bit to offer.

Again, here are major differences
between the northern and southern regions.

In the cooler north,
we find the low plains,

which are broad, dust-covered flatlands

with names like Utopia Planitia
or Amazonis Planitia.

Dark areas have been visible
on the surface of Mars

since early telescopes were invented;

these were thought to be oceans.

However,
the truth is that Mars is somewhat dry,

with only tiny amounts of water.

The southern hemisphere has geologically
older formations and more craters.

For example, the highland region
of Arabia Terra is densely cratered.

Among the numerous impact craters
in the southern region

is the biggest Mars Crater,
called Hellas Planitia.

The basin has a diameter of 1,300 miles

with a low point of five miles
below the ground level of Mars,

making it the lowest point
on the entire planet.

Running parallel to the equator
is the Valles Marineris.

These "Mariner Valleys" are the largest
known rift system of our solar system.

It stretches out for over 2,500 miles,

and is up to 440 miles wide,
and runs up to five miles deep.

It is a giant tectonic crack
of unknown origin.

In the western part,
called Noctis Labyrinthus,

it develops into a chaotic entanglement
of rifts and valleys

which are up to 12 miles wide
and up to three miles deep.

While on the topic of proportions,
Mars holds at least two records.

One being the giant volcano Alba Patera,

which covers the widest area
of all volcanoes,

with a diameter of 1,000 miles.

With a height of around four miles,
it's not as tall as Mount Everest.

However, Mars also has the Olympus Mons.

Measuring an
impressive height of 16 miles,

it dominates the surrounding plains,

and makes it the highest elevation
in our whole solar system.

Apart from Earth,

Mars is by far the planet
most thoroughly explored

and researched by mankind.

We know that Mars must have had a much
denser atmosphere millions of years ago,

and is likely to have had lots
of liquid water on its surface.

Back then, it offered much better
conditions for the creation of life.

That changed when its atmosphere
was thinned out by solar winds.

Still, in the ice of its polar caps,

there could primitive life
in the form of bacteria or microbes.

After all, such life has been found
in the perpetual ice of our own poles.

As you can see, there's a lot going on
out there in space,

even if we haven't encountered
any aliens yet.

But, let's start at the beginning.

Seven thousand light years away,
in the star constellation of the serpent,

lies the Eagle Nebula.

It's 95 light years high,
which equals about 55 trillion miles.

As a comparison, our solar system
is a mere 10 billion miles long.

Or in short,
the Eagle Nebula is kind of large.

In the Eagle Nebula, stars are born
from clouds of cold hydrogen.

These clouds are blown apart
by the emissions

from the already active suns,

creating chaotic shapes
of incredible beauty.

Sitting above the top of this structure

are gigantic, hot suns
that illuminate these shapes,

and thereby render
their three-dimensional shape visible.

At the same time, their solar winds
are thinning out this gigantic object.

This star factory must have been formed

in a particularly dense hydrogen nebula
that eventually collapsed.

It became denser and denser until
the high pressure triggered an explosion,

like in an atomic bomb.

It heated up other cold dust clouds,
eventually driving them to an ignition.

This caused shock waves
that swept through the formation.

The edge of one such shock wave
is visible in the brighter contour

that defines the upper left corner
of the nebula.

The heated gas has the effect
of a battering ram

on denser clouds of cold gas.

It compresses and eventually ignites them,
and the cycle continues.

You may be asking how this cosmic
chain reaction begun in the first place?

The infrared spectrum of the nebula
provides the answer.

Here, we see the cold accumulations
of hydrogen in a greenish tone.

The red hues show the hot dust,

and its concentric distribution
provides an explanation to its inception.

About 8,000 years ago,

a gigantic star exploded
right in that centre,

and the energy from this explosion
triggered the chain reaction.

At the same time,

the shockwave generated by the explosion
also drove the cloud apart,

which in effect caused the most
dense region to move slowest.

The dense gas clouds have become
the birth grounds of new stars.

Among them are the famous
"Pillars of Creation."

This sensational photograph was taken

by the Hubble Space Telescope
in the year 1995.

Now, this is a relatively recent picture
by human standards.

These pillars crumbled
thousands of years ago,

driven apart by the cosmic radiation
of the suns.

How is this possible?

Well, it takes light 7,000 years
to travel from there to here.

That means, when these light rays
finally arrive

at the sensors of our cameras,
they show a very distant past.

To get a better feeling for dimensions
as incredibly vast as these,

let's consider the composition
of our own solar system.

As we can see here,
Mercury, Venus, Earth and Mars are,

relatively speaking, close to one another.

If you look at the entire composition,
you could almost say they're cuddling.

Mars is followed by an asteroid belt,

after which the distances between
the planets grow larger and larger.

Last in line is Neptune.

Neptune is 2.7 billion miles
away from the Earth,

which doesn't even amount
to a light year in distance.

In fact, this distance is equivalent
to a mere four light hours.

To put that into context, if someone
flashed a gigantic light on Neptune,

we would be able to see it on Earth
four hours later.

From a distance,
Neptune appears to be a blue sphere,

a colour which is reminiscent
of planet Earth's oceans.

This is why Neptune was named after
the Roman god of the seas.

Actually, the colour is due to the fact

that Neptune's atmosphere is made up
mostly of methane.

Because of its properties,
methane absorbs red light.

In the upper layers of the atmosphere,

we see gigantic clouds
several thousand miles long.

They form in stripes because
of the high rotation speed of the planet.

At the poles, we have Auroras,

northern lights that look much more
complex than those we have on Earth.

This phenomenon occurs

when charged particles of the solar winds
enter the atmosphere.

Besides its 17 moons,
Neptune is also accompanied by its rings.

These rings are changeable
in size and shape.

The biggest one of them,
called the Adams Ring,

has a slightly red hue.

The majority of the rings
appear rather dark though,

rendering them difficult to see.

They're mostly made up of dust

and small particles
the size of grains of sand.

Neptune is a so-called Gas Giant,

meaning that the planet is almost
exclusively made up by its atmosphere.

In this thick soup, we have wind speeds
of up to 1,200 miles per hour.

On the way to the stony core,

which is almost as large
as the entire planet Earth,

the pressure grows massively.

Our NOMAD would be squashed in
a matter of seconds if it went any lower.

In fact, there isn't even
a defined surface due to the pressure.

The atmosphere gets liquefied
without transition,

which results in there not being much
to see on the way down,

just a wild spray of methane,
ammonia and water.

I guess it's safe to say
Neptune is not the nicest place to visit.

Its biggest moon, Triton,
is definitely more welcoming.

This "Son of Poseidon" is a bit smaller
than our Earth moon.

Despite its small mass,

it has an atmosphere which is less than
one percent as dense as ours.

Triton's surface is covered
by a thick crust of ice.

Cracks and deformations on the surface
make up a network of disturbances,

which is a sign of geological activity.

And really, there are geysers on Triton.

They shoot up through the surface ice
forming fountains into the atmosphere,

some as high as five miles.

Atmospheric winds spread the icy dust
over great distances,

until it settles back down on the side
facing away from the Sun.

The half of Triton that is in the shade
has temperatures down to -394 degrees.

This is the lowest temperature
ever measured in our solar system.

Such a winter lasts for 40 years
on Triton.

Another fascinating peculiarity is that
it moves in the opposite direction

to Neptune's rotation.

At the same time,
it's fairly close to Neptune,

so incredible tidal forces are created
due to gravitation.

These forces are believed
to be responsible

for the "cold volcanism" of the geysers.

In the long run, Triton isn't going
to remain in this position.

It is forced closer and closer to Neptune.

In a few hundred million years,

it will collide with Neptune,
which will cause it to be ripped apart.

The debris will form a much denser
ring system around Neptune,

resulting in a look similar to Saturn.

Until then, there is plenty of time
to take in

the breathtaking view of Neptune.

From here, we can also see
its second biggest moon, Proteus.

Well, again, we haven't had much success
with our search for alien life out there.

This begs the question of why so many
people believe in extraterrestrial beings?

A statistical explanation might be given
by the laws of probability.

Out there in space,

there are more stars than grains of sand
on the entire planet Earth.

With that in mind,

how could we be the only star system
with intelligent life?

The probability of there not being life
anywhere else in the universe

seems about as likely as a single person

winning a lottery jackpot
100 times in a row.

Humans tend to see familiar shapes
in astral objects,

like the face of the moon
or the shapes of the constellations.

Even experts in astronomy typically
name their findings on that basis.

That's why, for example, the Omega Nebula,
in the sign of Sagittarius,

hasn't solely been ascribed a scientific
name such as M17 or NGC 6618.

This phenomena has also been given more
poetic names,

like Horseshoe Nebula or Swan Nebula.

And we will now embark on a little
excursion to find the Hidden Dragon there.

The Omega Nebula is so bright that
it is visible to the naked eye from Earth.

You can only see it
as a grey lump, though.

You'd have to use the right equipment
in order to reveal its true beauty.

With images taken using visible light,

the first thing you notice is
the very bright region at the bottom left.

This is lit by O-stars.

Stars are categorised
into different classes,

with O-Stars being the heaviest
and hottest.

They emit blue light.

When we switch over
to the infrared camera,

we reveal the shape
of a fantastic firedrake

spreading its wings to take flight,
which was previously hidden.

This is a cloud of matter so dense,

it cannot even be penetrated by infrared
light which reveals this formation.

The scientifical name for this cloud
is M17Swex,

and inside, baby stars are hatching
at an amazing rate.

So far, no O-Stars have formed there,

but one day, they will light up
the whole area that now lies in darkness.

It will bathe in their bright light,
just like Omega itself.

You see, in addition to the gazillions
of possible habitats for alien lifeforms,

many more are being created as we speak.

It's still questionable if mankind
will ever be able to reach them,

given the fact that
even the light of these suns

takes thousands of years to reach us.

Since the beginnings
of human space-travel,

my fellow astronauts have said that
seeing the Earth from up here

is one of the most astonishing things
you can experience with your own eyes.

So, hold on to your seats.

But before we travel out there,

let's briefly take a look at how Earth
came to be in the first place.

We are taking a little detour
to the Orion Nebula.

Here lies a star-forming area
which is 1,500 light years away.

It appears as the bright region
in the "Sword of Orion,"

located in the sign of the hunter.

In this incredible cosmic configuration,

somewhere between 1,000
and 2,000 young stars are in the making.

These are made by four of the largest
stars in the galaxy, called the Trapezium.

Many of those stars
will later be surrounded

by planets formed in the process.

Around this trapezoid,
we find new-born suns

that are surrounded by so-called
protoplanetary discs.

These protoplanetary discs
are vast accumulations of material,

perpetually drawn
to the centre of gravity.

In that centre, a new star is forming.

After the ignition of the star,

leftover material
continues to circle around it.

Through the process of accretion,

the concentration
of these cosmic particles,

bigger masses of material start to form.

As these grow larger,
they grow into what we call asteroids.

Directed by the Sun's
gravitational attraction,

the asteroids move around at high pace.

They crash into each other repeatedly,

resulting in the forming
of bigger masses of rock.

Eventually, some of these asteroids
grow large enough

to have a significant gravitational pull,

and therefore,
pick up more and more material.

Over time, this process leads them
to become planets.

Some of these planets even develop
an atmosphere

by collecting particles of gas
floating through the surrounding space.

For example, in this image,

hydrogen and sulphur are visible
in a greenish tone,

and carbon-rich molecules
have an orange-red hue.

The yellow specks of light
are the young stars

that are deeply encased in cocoons
of dust and gas.

The Orion Nebula is also home
to some brown dwarfs.

That's what we call "failed stars,"

meaning that they weren't able to collect
enough mass

to keep a constant nuclear reaction
running.

In essence,
a sun is a gigantic fusion reactor.

Fortunately enough,
the Earth's sun has been running steadily

for approximately five billion years now.

So let's have a look at this hot centre
of our solar system.

The eight planets of our solar system

are circling around
the star in their centre

on elliptical orbits
with differing trajectories.

Earth has a mean distance of around
100 million miles from the Sun.

In order to be able to look at the Sun
with our human eyes,

we need to decrease
its luminosity by 98 percent.

We are now looking
at the pulsating surface,

where temperatures soar
up to 3.5 million degrees Fahrenheit.

In the very core of the sun,
it reaches 27 million degrees

because hydrogen is constantly fused
into helium.

The fusion reaction causes the release
of energy in the form of photon rays.

These photons dart around at light speed,

but as they collide
with matter frequently,

it takes a thousand years on average
for them to finally leave the Sun's centre

because it's so dense.

Compare that to the mere eight minutes
it takes for the photons to reach Earth,

once they have escaped the sun's centre.

In this light from the Sun,

Earth predominantly glows
in the luscious blue of its oceans.

The continents appear
mostly brownish and dark,

while the second most dominating colour
is white,

due to the white clouds in our atmosphere

combined with the vast ice crusts
at the poles.

Seen from space,
everything looks smooth and quiet.

This is a stark contrast
to the violent affair

characterizing its creation.

After a core had formed from materials
of the sun's protoplanetary disc,

the young Earth was subject
to a constant bombardment

of asteroids and other celestial bodies.

One particularly heavy asteroid
ripped off a part of the Earth's mantle.

This rubble remained in orbit,

and supposedly formed the moon
over the course of the millennia.

As the rate of the bombardment
finally decreased,

Earth slowly cooled off,

resulting in the forming
of a solid crust of stone on the surface.

Still, there were frequent
volcanic eruptions as well as gasses,

which eventually formed an atmosphere.

Vaporised water condensed,

and returned to the surface
in the form of rain,

while meteors of ice
filled up the first oceans.

A hydrological cycle was set into motion,

and over the subsequent millions of years,

evaporation and rainfall
eroded the rocky surface of Earth.

The first supercontinent broke apart
several times over,

and in time, land masses took the shapes
of the continents we know today.

Eventually, life appeared on Earth.

It probably began with amoeba
in the water,

continuing to fishes and on to land-life,
reptiles, birds and mammals,

and eventually, man.

Scientists are still exploring the wonder
of life's creation and its prerequisites.

The most common assumption is that water,
oxygen and sunlight

were the needed ingredients
to get things started here on Earth.

But all of these wouldn't have done much
without another all-important factor:

Earth's magnetic field.

This huge forcefield shields us
from deadly radiation from the Sun.

The magnetism is created
by complex geo-dynamical activity.

It diverts solar winds around our planet,

preventing them from diminishing
our atmosphere and oceans.

So without the crucial magnetic field,

Earth would probably have become
as barren and bleak

as our silent companion, the Moon.

Being the closest astral body to Earth,

the Moon has fuelled the imagination
of mankind for millennia.

The idea of extraterrestrial life
on the Moon has been communicated

through paintings, songs and literature.

Even some of the first silent movies
depicted life on the Moon.

But by the time man first set foot
on the Moon in 1969,

it was rightly anticipated
that the astronauts

would not encounter any moonsfolk.

Regardless of the absence
of extraterrestrial lifeforms,

the Moon remains truly fascinating.

With a diameter of 2,000 miles,

Earth's companion is the fifth largest
moon in our solar system.

The moon needs four weeks to orbit
once around the Earth,

a fact that is mirrored
in our everyday language:

the word "month" is a derivate of "moon."

Through its gravitational pull,

the Moon bears significant effects
on Earth.

The most visible effect
is our tidal system.

The Moon also plays a role
in maintaining the crucial magnetic field.

The Moon even bears an effect
on Earth's biosphere;

some species, including birds and insects,

make use of the Moon
for navigational purposes.

As far as looks are concerned,

the Moon remains a bit dull because of it
being completely covered in grey dust.

The dust layer is produced
by meteor strikes.

Because of the lack of atmosphere,

meteors crash onto the surface
of the Moon without any damping,

and are pulverised in the process.

The "Moon dust" produced this way
actually resembles sand,

or scientifically speaking, regolith.

So far, water has only been traced
in microscopic quantities.

Nevertheless, we still group the Moon's
surface into areas of "lands" and "seas."

We talk about lands and seas
on the Moon today

because of earlier times'
scientific beliefs

that the dark areas on the Moon
contained water.

We now know that those "seas"
are in fact basins of solidified lava.

Most likely, they were created
by heavy asteroid hits

during the Moon's early days.

At that time, the Moon's crust
was still molten underneath,

and therefore the craters created
by the asteroids' impact

became filled with lava.

Interestingly enough, the Moon is still
geologically active today.

To be more precise,

the activity is so fierce that moonquakes
occur up to ten times a day.

Most of these are moderate,

but some reach up to Level 5
on the Richter scale.

On Earth, this would be enough
to seriously damage unprotected buildings.

Well, fortunately,
there are no buildings here,

and the craters don't seem to mind
a little moonquake from time to time.

Even if the Moon's landscape
is lacking in variation,

you still have a great view from here.

Our blue mother planet rises majestically,

and you also get a perfect view
of the stars,

without an atmosphere or light pollution
hindering the outlook

like it does from Earth.

Let's head out for another visit up there.

About 6,500 light years away,
in the star sign Cassiopeia,

there are two neighbouring nebulas:
The Heart and the Soul Nebula.

Here, we find several generations of stars
in a distinct configuration.

These images provide
the most convincing evidence

for the most widely-acknowledged theory
explaining how stars are created.

In each of the centres of two large
cavities we find a very old star,

both close to 10 times bigger
than our own sun.

Over the course of millions of years,

the radiation from these two large stars
has swept away the surrounding star dust.

In that process, a mixture of matter
and gas is compressed,

ultimately triggering
the ignition of new stars.

Accordingly, the outer areas of these
two cavities are lined with young stars,

we see them here as pink dots
at the pointy ends of the tubular pillars.

If we go a bit closer,

we'll discover a formation that scientists
have called the "Mountains of Creation."

This is a reference to the
"Pillars of Creation" in the Orion Nebula

that we saw earlier.

The "Pillars of Creation"
are only tiny fingers

when compared
to the "Mountains of Creation."

Here you see the two side-by-side
with a matching in scale.

This section alone
of the "Mountains of Creation"

is 50 light years wide,
which is equal to 295 trillion miles.

In the central formation,
hundreds of emerging stars are visible,

they appear in a yellow-white tone.

The matter visible in red
consists of aromatic hydrocarbonates.

It's heated by the light
of the young stars,

and thus becomes visible
to our thermal cameras.

If we were to wait
a couple of million years,

new planets would emerge here as well.

But I think I don't have
the patience for that,

so let's return to our own
stellar neighbourhood

and inspect some existing planets.

Now, landing a man on the moon denoted
a great triumph for mankind

and for science in general.

Other manned missions into space
have been in planning since then.

The target has always been Mars.

When you consider the fact that Venus
is actually our nearest neighbour,

this seems a little strange.

Fortunately, we have a NOMAD unit
right down there on Venus at this moment.

Let's switch over
to the live action camera

to see for ourselves why the conditions
are not too welcoming.

Venus is the second brightest object
on our earthly sky.

Due to its low orbit,

Venus is hardly visible during night time

and is therefore known
as the Evening Star.

Sometimes it's bright enough to be
visible to the human eye during daytime.

The reason we're able
to see Venus this clearly

is due to its dense
and light-reflecting atmosphere,

combined with its close proximity
to Earth.

In fact, Venus is not only positioned
close to Earth,

it also bears similarities with a number
of key physical properties,

to the degree to which the two planets
are often referred to as sister planets.

Venus has approximately
the same size, density and mass as Earth.

Likewise, the gravitational force
is close to 90 percent.

In spite of these resemblances,
there are major differences.

The atmosphere is so dense
that it completely shields the surface

from our visual field.

Good thing we can always rely on radar
and infrared cameras.

So let's take a closer look
at Venus's surface.

The average surface temperature on Venus
is 867 degrees Fahrenheit,

which makes Venus the hottest Earth-like
planet in our solar system.

The first Russian probes to arrive here
in the second half of the 20th century

were literally crushed
by atmospheric pressure.

Venus has a surface air pressure

equalling the pressures found at 4,000
feet below sea level in Earth's oceans.

Luckily, our NOMADs are much more durable.

Looking around down here,
it seems perfectly fair

to agree with claims that downtown Venus
resembles popular depictions of Hell.

Sulphuric clouds,

acid rain, and active volcanoes
are all on the list of local attractions,

alongside dimly-red glowing surfaces
littered with craters.

And with the aid of radar image systems,

we are able to investigate
the local topography.

Logically enough,
there is no water on the surface

because of the high temperatures.

That doesn't prevent us from geologically
distinguishing between high and lowlands.

The two highest plains could be described
as the continents of Venus.

The one we see here carries the name
Ishtar Terra,

and is placed in the northern parts
of Venus.

This area is about the size of Australia

and is home to the Maxwell Mountains,
among others.

Its peaks reach over six miles,

similar to the Himalaya mountains
back on Earth.

The other continental formation
is named Aphrodite Terra

and covers an area
the size of South America.

It runs across the equator,

shaped in a formation that looks like
the outline of a scorpion.

This "Land of Aphrodite" consists
of three bulged formations

called Ovda, Thetis and Atla Regio.

The Atla Regio
is divided by gigantic trenches.

These steep-walled valleys or chasmas

look similar to the canyons
of North America.

Atla Regio is adorned with huge volcanoes.

Among them is Maat Mons,

a giant of five miles towering over
the other Venusian volcanoes.

In total, there are over 50,000 of them.

It's not surprising that
the whole surface area of Venus

is composed of shapes
made of solidified lava.

Among them are some rather
strange-looking specimens,

like these circular pressure domes,
suitably called pancakes.

Other distinctive features of Venus
are lava channels of incredible length.

They have an average width
and depth of a mile,

and run for thousands
and thousands of miles.

The longest one, called Hildr Fossa,
is some 4,200 miles long,

out-competing the reach of the Nile,
Earth's longest river.

Another feature of Venus,
or more accurately, lack of feature,

is the absence of a moon.

Standing on Venus's surface, you wouldn't
have been able to see a moon anyway

because of the thick atmosphere.

These thick layers of clouds
not only obscure our visual field,

but may well hide Venus's biggest secret:

Some scientists claim that it's plausible
that microorganisms inhabit these clouds.

Well, to be honest,
using NOMAD's advanced sensors,

I could easily reveal the truth about
whether or not microorganisms live here.

But, I don't want to spoil all the fun.

But you know,
since life could somehow emerge

in the primordial ooze of our Earth
millions of years ago,

why shouldn't it have happened
elsewhere, too?

Or maybe it's happening right now
as we speak.

And why not in our nearest vicinity?

Venus, after all,
is located only marginally outside

the calculated "habitable zone"
of our solar system.

Mankind can only find answers
to that big question through research.

Satellites and probes will have to be sent
up there,

they will have to scan,
sample and analyse large amounts of data.

Although we live in a highly progressive
and technologically advanced time,

large portions of our own solar system
still remain in the dark.

As we have seen,

there is a ring of asteroids
separating the orbits of Mars and Saturn.

Neptune is the outermost one
of our major planets,

but our solar system
stretches much farther.

Behind Neptune, we find a huge
asteroid field called the Kuiper Belt.

It's 20 times wider
than the central asteroid ring

and is home to over 70,000 objects
of more than 60 miles in size.

These objects are leftovers
from the creation of our solar system,

material that wasn't included
in the formation of our planets.

Some of these objects came very close
to transforming into planets.

Best-known among them is Pluto.

From 1930 until 2006,

it was officially defined
as the ninth planet of our solar system.

When the trans-Neptunian object Eris
was discovered in 2005,

the media quickly announced it
to be our tenth planet.

The scientific community
decided differently,

and came up with a new category
to accommodate these types of objects:

dwarf planets.

In the process, the similar-sized Pluto
lost its status as a regular planet.

As scientists look closer
into the Kuiper Belt,

more and more dwarf planets
are discovered.

All trans-Neptunian planets
have been named after Earthly deities.

For example, Makemake, a Polynesian god.

Then there is Sedna,
the Inuit goddess of the sea.

Or the distinctively ellipsoid Haumea,

named after the Hawaiian goddess
of childbirth.

While our scientists act
as diligent midwives,

finding and naming
more and more of these little rascals,

it's near impossible to acquire any
meaningful data on these new arrivals

while sitting here on Earth.

Even the only dwarf planet
of the inner solar system

remains mostly unexplored.

Ceres sits right between Mars and Jupiter
and has a diameter of around 600 miles.

It supposedly carries a significant amount
of water ice,

which has led to speculation
that life may exist there.

That's why our engineers work
around the clock to build more probes.

Hopefully, we'll have more data on Ceres

and the trans-Neptunian dwarf planets
in a couple of years.

Current spacecraft take about nine years
to reach Neptune, though,

so this might take a while.

The view of Earth from here
is breathtaking,

and as we have already discovered,

outer space continues to hold
a number of surprises in store for us.

Today, you may be surprised
by the appearance

of some of the faraway planets
we're about to visit.

We have even deeper insights
in store, too.

You may recall
that we've previously unravelled

how planets and stars come into existence,

but as the saying goes:

"What goes around, comes around."

And everything has an end.

Even incredibly powerful objects
like our sun.

I'm going to show you
what that looks like.

The sign of Taurus is home
to one of the most interesting

and most studied objects of visible space:
the Crab Nebula.

The torn and furrowed appearance
of this stellar nebula

gives a strong hint
as to what has happened here:

a star exploded.

As we know, the Sun can be described
as a gigantic fusion reactor.

At any given time, helium and oxygen
detonate inside of it.

Under most circumstances,
the detonation of helium and oxygen

would result in a star
blowing into pieces,

but the Sun's incredible gravity
prevents that from happening.

Over the time of billions of years,
this interaction depletes matter.

In the case of the Crab-Sun,
gravity eventually lost the battle.

The Crab-Sun exploded
around a thousand years ago,

in the year 1054 AD.

The explosion was so bright
that it could be seen during daytime,

according to ancient Chinese astronomers.

During the 1,000 years
that have passed since,

the remaining core of the Crab-Sun

has turned into an extremely dense
neutron star.

It continues to spawn a large number
of high-energy particles,

and therefore the Crab Nebula
takes an ever-changing shape.

Well, in case you're wondering:

Yes, one day, our sun will unfortunately
share a similar fate.

But don't worry,

it should still be good for another
couple of billion years.

When that day comes,

the Sun's first victim
will be its closest planet: Mercury.

Now, in addition to the threat
from the Sun,

Mercury is having
a bit of a rough time in general.

So let's not waste time talking,
let's have a closer look instead.

After all, in a few billion years,
it might be too late.

Mercury is the last "Earth-like" planet
in our solar system.

Actually, apart from
having a rocky body like Earth,

it has not many other Earthly properties.

Visually, this planet resembles the Moon.

This corresponds well with Mercury being

the smallest regular planet
in our solar system.

Mercury does not have an atmosphere,

something which is evident
from its crater-littered surface.

There's nothing preventing meteorites
from hitting Mercury at full speed.

From up here,

these craters may misguidingly
look like innocent footprints in sand,

but if we go up close,
they reveal their true size:

they are gigantic.

The ten largest craters have diameters
ranging from 125 to 1,000 miles.

The largest one is known as Caloris Basin.

This huge dent can only have been created

through the impact of an astral body
at least 60 miles in width.

As a result of this brutal impact,

the crust of Mercury's surface
was cracked,

allowing for the basin
to be flooded with lava,

a process very similar to those that
caused the "seas of lava" on our own Moon.

Other indications of the brutal forces
of the meteoric impacts

are the radial marks
surrounding the craters.

Here, more recent, and therefore brighter,

meteoric rudiments are scattered around
the point of impact.

Larger craters are typically
surrounded by ring-shaped walls,

created through folding,

another phenomenon reminding us
of the make-up of our moon.

A phenomena exclusive to Mercury
are the so-called Rupes:

cliffs reaching more
than a mile in height,

and stretching over a hundred miles.

The Rupes cross right through
a number of the meteoric craters,

which makes scientific experts believe

that these cliffs may have been
caused by a shrinking of the planet.

According to calculations,

Mercury's overall diameter may have been

more than two hundred thousand square
miles bigger four billion years ago.

Despite its similarities to our moon,

Mercury isn't exactly
a nice place to visit.

That's because of its proximity
to the Sun.

The Sun-facing half of Mercury
is heated to extreme temperatures

reaching up to 750 degrees Fahrenheit.

On the night side,

temperatures go as low as to -275 degrees.

These conditions make Mercury the planet

with the widest range
of temperature spans.

The day-cycles are similarly extreme,
a night on Mercury lasts pretty darn long.

The Sun only rises every 176 days
due to Mercury's eccentric spin.

And while you're waiting in the dark
for the morning to come,

Mercury does two rounds around the Sun.

At least it's safe to say

when the Sun finally rises,
it really shines hard.

The distance between Mercury and the Sun
is only 30 million miles,

just one-third of the distance
between us and the Sun.

Standing on Mercury's surface,

you would not only be exposed
to massive heat,

but also a lot of solar radiation,
which is very hazardous to humans.

Luckily,
our NOMADs are not that susceptible.

Still, I bet that little guy down there
is getting pretty warm now.

Now, all of our comparisons about the Moon
and Mercury prompt a related question:

What about Mercury's moon?

Well, the answer is, just like Venus,
Mercury doesn't have a moon.

Now, this fact has led scientists
to believe

that perhaps Mercury once orbited Venus.

Such a theory would explain

why Mercury's orbital trajectory
around the Sun is so irregular.

Geometrically speaking, Mercury's
trajectory takes a gyrational form,

as it was observed
in the late 19th century.

Astronomers at the time mistakenly
interpreted it as proof of the existence

of a previously unknown planet.

In fact, they were so convinced
by the evidence

that they gave that phantom planet
a name: Vulcan.

While I still hope for the Vulcanians
that they will live long and prosper,

they would certainly have to do that
some place else.

Another very improbable location
for their home

would be the Helix Nebula
in the sign of Aquarius.

This celestial object was named
Helix Nebula in the 18th century.

Through early telescopes,

the nebula looked similar
to gas giants like Jupiter.

More accurately, it's the remains
of another supernova, an exploded sun.

At the end of their life, stars blow their
gaseous components far out into space.

The remaining core,
known as a white dwarf,

keeps heating up these gas particles,

and thereby drives them farther
and farther away.

In the case of Helix Nebula,

the result looks somewhat like
a gigantic eye.

This similarity becomes most obvious
in infrared view mode.

An eerie sight,

that is somehow fitting
for the fatal events that took place

in that extinct solar system.

We can now see the white dwarf
as a bright spot in the middle,

while the most recently emitted gases
are tinted in red.

The blue-greenish elements
are much cooler gas particles.

When the explosion happened,

all planets and moons in that nebular
system were torn from their orbits,

and were either ripped to pieces
by the gravitational forces

or burnt down by the vastly expanding sun.

At least some comets survived,

and they continue to make their way
through the galactic rubble.

And meanwhile,
that huge eye of the Helix Nebula

keeps staring into space.

Maybe it's looking for that ring,
you know?

I mean, the rings of Saturn, of course.

Saturn is the sixth planet
of our solar system.

Located almost one billion miles
away from Earth,

it's incredible that it's visible
to the plain human eye in our night sky.

That goes to prove that Saturn
is pretty big.

To be exact,
it has a diameter of about 75,000 miles,

making it the second largest planet
in our solar system.

Looking through
even the simplest of telescopes,

the most striking feature of Saturn
can be seen from Earth:

Saturn's distinctive ring system.

The stylised shape of Saturn
with its rings

has become a symbol for astronomy,

space-faring and science-fiction alike.

Let's take a closer look at that disc
that Saturn seems to be stuck in.

Once we get closer,
we can differentiate between a number

of more or less sharply defined rings.

There are over 100,000
separate rings around Saturn,

each with different colour tones
mirroring their composition.

The rings are visibly separated,

you can easily sense
the gaps between them.

The material composition
of the individual rings

becomes pretty evident
when we get up close,

the rings are asteroid fields
circling around the planet.

In these rings,

a diverse range of compounds
of differing sizes whirl about,

some as small as grains of sand.

Some of the smaller moons of Saturn
are ploughing right through these rings.

These moons are called shepherd moons,

because their orbits ensure
that the rings are kept nicely in shape.

Unfortunately,
we cannot set foot on Saturn.

Like all the gas giants,

it doesn't have an actual
physical surface.

Its atmosphere consists mainly
of hydrogen and helium.

Towards the planet's core,

the pressure rises
to incredible magnitudes,

prompting the gases to liquefy.

What we can do is send our NOMAD
into the outer atmosphere.

Saturn has two distinctly
separated cloud layers.

From space,
the lower layer isn't even visible,

because of the density of the outer layer.

So the sight here is really rather rare.

Now we are closing in
on the whirlwind at the south pole.

This whirlwind is a hurricane
with a fixed position,

and a diameter of 5,000 miles.

The north pole offers
a similarly distinctive feature,

a polar vortex in the shape
of very tidy hexagons.

This phenomenon
stretches out over 15,000 miles,

and is several hundred miles deep.

Since our NOMAD is already out here,
it would be a wasted opportunity

if we didn't embark
on a touchdown somewhere.

Fortunately, some of Saturn's 62 moons
are really big fellows.

Four of them have diameters
ranging from 500 to 1,000 miles.

That's half the size of our own moon,
and they also look pretty familiar.

Firstly, there's Rhea.

Exposed to temperatures of between
-275 to -365 degrees Fahrenheit,

its surface is made of water ice
by two thirds.

Thanks to gas emissions,

Rhea has a very thin atmosphere
made of oxygen and carbon dioxide.

The surface is littered with craters
as on Earth's moon,

but the craters appear visually softer.

That is because Rhea's crust is more
flexible than that of our own moon.

Rhea's smaller sister Dione
shares similar features.

It's also mostly comprised of ice,
but has more sharply-drawn craters.

Additionally, it has light stripes.

They are likely to have been caused
by cold volcanism.

Staying in the family analogy,

Thetys could then again
be the younger brother of Dione,

as these two moons look almost identical.

The most striking feature of Thetys
is a giant impact crater named Odysseus.

It covers close to 40 percent
of Thetys's surface.

Due to the orientation of that crater,

Thetys may remind
science-fiction enthusiasts

of a certain deadly battle station.

This distinctly bi-coloured moon,
Iapetus, on the other hand,

reminds me more of
the Ying and Yang symbol.

A big part of its icy surface
is tinted in a dark red.

Scientists are still unsure of exactly
how this pattern developed.

Possibly, differently coloured material
may have emerged from within Iapetus,

through processes of volcanic activity
or meteoric impact events.

Another striking feature of Iapetus
is a rift stretching over 800 miles.

This formation is up to eight miles high

and somehow makes the Moon look like
a walnut when seen from a certain angle.

Possible explanations for this anomaly

include tectonic activities
and crashed remains of an asteroid ring.

The mini-moon Enceladus
also has an interesting surface.

It's very bright, because it consists
of almost flawless water ice,

making it reflect 99 percent
of all incoming sunlight.

Enceladus is the most reflective
astral body in our entire solar system.

Another source of Enceladus' ever-fresh
looks is its active cryo-volcanism.

Geysers keep renewing the surface
by spitting out ice fountains

of up to 300 miles in height.

Analysis of the discharged material

has shown a very high density
of organic chemicals.

Such organic materials in combination
with water and moderate temperatures

form the basic components necessary
for the creation of life.

So it seems like the only thing preventing
life on Enceladus is warmer temperatures.

That's quite an exciting discovery.

But, one that will be topped by
the last stop on our little tour of moons.

The biggest of Saturn's moons
is a really big guy.

In fact, it's even bigger
than the planet Mercury,

and has therefore aptly been named Titan.

Titan holds a number
of additional features

making it appear more like
a full-grown planet in its own rights.

And not just any full-grown planet,
that is Titan is even Earth-like.

Yes, in fact, Titan is the astral body
in our solar system

that resembles Earth the most.

But, let's start at the beginning.

Titan has a diameter of 3,200 miles,

and is the only known moon
to have a really dense atmosphere.

This atmosphere is rich on clouds
and consists mainly of nitrogen,

although it carries traces
of carbon hydride

and other organic components, too.

The clouds are made up of methane,
ethane and other hydrocarbons.

At Titan's surface,

the average temperature is as low
as -275 degrees Fahrenheit.

Still, Titan has landscapes
that look a lot like those on Earth.

Along the Equator, for example,
lies a region called Xanadu,

which is about the size of Australia.

Here we find mountains
of up to a mile in height.

They were created by water ice
that was washed down by methane rain,

causing them to take their current shape.

Due to the low temperatures,
the ice is as hard as silicate rock.

There is no water, of course.

Instead, pools and even seas of methane
define the landscape.

Contrasting the methane seas
are desert-like areas dominated by dunes.

These landscapes have most likely
been formed in a similar manner

as dunes on Earth, by wind.

Wind speeds as low as two miles per hour

are enough to make these sandy particles
shape into dunes.

These dunes are several hundred miles long
and up to 500 feet high,

and consist of sand particles
that are about a tenth of an inch small.

These are made up of organic materials

that dried after raining
onto Titan's surface.

Now, with all these similarities to Earth,

life is not out of the question.

Because of the cold, it's impossible
for water-based lifeforms to exist,

but recent discoveries on Earth
would suggest the possibility

of lifeforms that are based on hydrogen.

And Titan is practically teeming
with hydrogen.

So, I'd say it's about time
we send a couple of more rovers up there

to look under every piece of icy rock.

Maybe there are some microscopic aliens

like bacteria and microbes
up there on Titan.

Maybe there once were in the past,
or maybe they'll emerge in the future.

We don't know.

No one can say with certainty
what sparks the ignition of life.

One thing is sure though,
all life is part of an eternal cycle.

This is true for suns as well.

When one star explodes,

a shockwave runs through space,

carrying an incredible amount of energy.

For example,
in the case of the Crab Nebula,

it was the equivalent
of a hundred thousand suns.

Now, this energy fuels the creation
of new stars, and with them, new planets.

We have seen what this process looks like.

We saw the material shot out by
dying suns form cosmic nebulas at first,

only to later become part
of new stars and planets.

This is the cycle of cosmic creation.

The by-product
is sights of incredible beauty.

So why don't we let some of them
unfold before us?

Here we have the American Nebula,
for example,

clearly named for its resemblance
to the North American continent.

This likeness is only noticeable
in the visible light spectrum though,

in infrared view,
the whole thing looks entirely different.

But no less fascinating.

A totally different visual experience
is provided by the Rho Oph Nebula.

A mere 407 light years away,
it's the star factory closest to Earth.

The 300 suns we find here
have an average age of 300,000 years.

That really makes them babies,
from a star's point of view.

After all, the oldest discovered stars

have been around
for over 12 billion years.

The Pleiades,
also known as The Seven Sisters,

are also readily visible from Earth.

That makes them the subject
of many old scriptures and legends.

These suns were created when dinosaurs
were still roaming the Earth,

about a hundred million years ago.

That makes the Pleiades
quite a bit younger than our own sun,

which has about five billion years
on the meter.

Some experts believe that our sun

was born in a dense, star-forming region
like the Pleiades,

and then later moved
to its current position

over the course of millions of years.

As you can see, there really is quite
a lot going on out there in space,

even if we haven't encountered
any real aliens yet.

But we still have two stops to make
on our galactic tour de force.

One of them is Jupiter,

no less than the largest planet
in our solar system.

And we have over 80 moons
to take a look at.

Hey, welcome back
to the International Space Station,

in the year 2057.

We've been looking for alien life
in our solar system and beyond.

We've learned many interesting things
about our neighbouring planets so far,

and also found some possible habitats
for extraterrestrial beings,

at least at the level of bacteria
and microorganisms.

Now today, I have another
surprising highlight,

one that you possibly
didn't even know existed.

But, more on that later on.

We've learned about the creation
of suns and their planets,

as well as their demise.

These are objects of incredible
proportions, magnitude and distances.

Every huge object out there seems to have
an even bigger sibling hidden somewhere.

Today, let's begin by looking at our
home world from really far away.

By doing this, we can get a better feeling
for the scale of our solar system

and its context in the galaxy.

We are now looking at our own solar system

with the Sun,
the eight planets and their moons,

as well as some asteroids,
and the dwarf planet Ceres.

At the far reaches lie the Kuiper Belt,

more dwarf planets
and many, many more asteroids.

All of this covers an area of more than
4.7 billion miles in diameter.

On one hand, this sounds incredibly large,

but on the other,

it's just a tiny fraction
of the Milky Way.

In our night sky, you can see parts
of the Milky Way with your own eyes.

It's visible in rural areas
with little light pollution,

looking like a brush of milky fog
across the sky.

What we actually see is the light
of millions of faraway stars.

They all belong to our galaxy,

a word that has its origin
in the Greek word for milk: gala.

The ancient Greeks believed in a legend
about the creation of the Milky Way.

Supposedly, their chief god Zeus had tried
to make his mortal bastard son Heracles

breastfeed from his wife Hera.

She pushed the infant away,

causing some milk
to be spilled across the skies.

We see this scene here
in an interpretation

by the Italian painter Jacopo Tintoretto.

The streak we can see in our night sky

only represents a small fraction
of the Milky Way.

Since we reside inside it,

it's not possible to get a real photograph
of the entire Milky Way.

Still, observations, calculations
and comparisons with other galaxies

have given scientists
a good representation

of what our Milky Way looks like.

Emerging from a central streak,

two mighty spiral arms
define its appearance.

These arms are occupied
by particularly bright stars.

Our own solar system lies far out
from the centre of our galaxy.

In this depiction,
it can be found in the southeast.

Altogether, our galaxy has a diameter
of about 100,000 light years.

So if we travelled at light speed,
around 671,000,000 miles an hour,

it would take 100,000 years
to get from one end to the other.

This pretty much defies our imagination,

so I'll scale it down to sizes
that we can better grasp.

Let's assume our galaxy
was 10 miles square.

In that case, our solar system would have
the width of a single strand of hair.

It would be just barely visible
to the naked eye.

And our Earth would be the size
of a single atom.

But before we get dizzy from imagining
the proportions

of how vast the Milky Way is
or how incredibly small we are,

let's take a look closer to home.

Even here, the scales are still hard
to fully appreciate.

The planet Uranus
is roughly three billion kilometres away.

A supersonic jet would need at least
200 years to cover that distance.

As we have already heard,

Earth and Venus are considered
to be sister planets,

because of their many similarities.

Neptune even has a twin,
it's been classed as Uranus.

Like all twins, the two of them
can be easily confused.

Uranus is named
after the god of the skies,

because compared to the deep blue shade
of Neptune,

it appears light-blue
with a touch of green.

This is for the same reason as Neptune.

The methane in the atmosphere
is responsible for the colour

as it absorbs red light.

Uranus and Neptune are richer with water,
ammonium and methane

than the two other gas giants,
Saturn and Jupiter.

That is why they are in the sub-class
of the Ice Giants.

And really, it's with good reason,
as it is blistering cold on Uranus.

For reasons still unknown,

Uranus is the only planet that doesn't
have an internal heat source of any kind.

All of its energy comes from the Sun,

which is not much,
given it's two billion miles out.

To be precise,

Uranus receives only a four-hundredth
of the total energy reaching Earth.

Due to the low amount of heat
reaching the atmosphere of Uranus,

it doesn't display
as many weather effects as Neptune.

There are the occasional cloud bands
as large as 18,000 miles in length,

but they dissolve pretty quickly.

Possibly, the inner cold of Uranus

may have something to do
with a horrendous meteor strike.

This is a conclusion drawn from the fact

that the axis of Uranus
is severely tilted.

Therefore, we mostly see Uranus top-down
when we look at it from Earth.

In this perspective,

the ring system makes it
look a bit like an archery target

while the moons circle around their planet
like hands on a clock.

Having a ring system
is common for gas giants,

and again, Uranus's rings
are similar to Neptune's.

They're made up of very small,
dark particles.

The rings My and Ny are somewhat special,

because their composition makes them
appear slightly red and blue respectively.

All the other rings are a dark grey.

Again, we find some shepherd moons here,

that help keep the rings in shape
by ploughing through them.

In total, Uranus has 27 moons,

with diameters ranging from
six to 1,000 miles.

Their small sizes means
that they are pretty lightweight.

Together, they weigh less than
Neptune's moon Triton alone.

The five major moons, Miranda,
Ariel, Umbriel, Titania and Oberon,

all look relatively similar,

and visually, they could be
smaller versions of our own moon.

To look at it,
the most interesting is Miranda,

because she has some very different
surface structures,

including heavy displacements,
fragmentation patterns,

and a labyrinth of canyons
that runs up to 12 miles deep.

This makes Miranda a unique astral body
within our solar system.

There are different theories about how
these formations have been created.

The most probable one suggests
that Miranda once travelled into

the gravitational reach of Umbriel
and Ariel.

These forces heated Miranda up,

and because she is made
of 80 percent water ice,

this led to strong tectonic effects.

After a while,
Miranda broke free from those forces

to assume her current orbit around Uranus.

Well, I don't know about you,

but I feel slightly disappointed
by Uranus.

No actual surface to land on,
no impressive weather effects,

and the moons aren't too exciting either,

if you have been to our Earth's moon,
that is.

So I think we deserve to treat
ourselves now,

and fortunately, space gives us
plenty of opportunities for that.

Since we have been looking
at our Milky Way today,

I'm going to additionally show you

some of the most beautiful,
distant galaxies out there.

Let's start with Messier 74.

It's a classical spiral-shaped galaxy,
not unlike our own.

However, the arms of M74
are decorated with bright pink areas.

Those are clouds of gases,
lit up by the light from young stars.

These regions produce
a large amount of ultraviolet light,

hence the pink colour.

Much more asymmetrical is the appearance
of Messier 66,

the biggest galaxy of the "Leo Triplets."

Its displaced looks are owed

to the gravitational forces
of its two siblings,

that are relatively close by,
at least when speaking in galactic terms.

Galaxies are drifting through space,

which allows for occasional
breathtaking compositions.

For example, this pair of galaxies
known as Arp 273.

Scientists assume that the smaller galaxy
has fully passed through the bigger one,

and as result, created a form
that reminds us of a rose.

In a couple of billion years,

our own galaxy may collide
with our neighbour Andromeda.

Something similar has happened
with the Antenna Galaxies.

These two galaxies merged
when they crashed into one another,

and the resulting forces have spawned
billions of new suns,

most of them in tightly-packed groups
called super star clusters.

Those were some truly impressive images.

It's a pity these galaxies are so far away

it keeps us from taking
an even closer look at them.

Nevertheless, we still do have one
major planet left in our own Milky Way,

and this one is almost a solar system
in its own right.

How is that possible? Let me show you.

We are now visiting the biggest planet
of our system: Jupiter.

It alone weighs more than all of our other
planets added together.

It is so huge, that despite being
480 million miles from Earth,

it's one of the brightest objects
in our night sky.

It was named after the Roman god Jupiter,

a very long time before the invention
of the telescope.

The Babylonians called it the King's Star,

and indeed, Jupiter reigns over
its own little realm.

With its 63 moons,
some nearly planet-sized themselves,

it can almost be described
as a solar system of its own.

Really, if Jupiter had only gained
a little more mass,

it probably would have ignited
and become a sun itself.

While that would have been spectacular,
it obviously hasn't happened,

but Jupiter does,
at least, have a ring system.

However, it's not too visually impressive.

It's made of tiny particles
almost comparable to cigarette smoke.

These little grains are mostly black
and therefore hard to see.

Their origin is interesting, as they are
made up of dust from the adjacent moons.

Dust is produced from these moons
when they are hit by meteors.

Due to the low gravity of these moons,

the debris is blown out
into Jupiter's orbit,

which has resulted in the main ring
being mostly made up of dust

from the moons of Adrastea and Metis.

Another interesting fact is that the rings

are moving closer to Jupiter
on a spiral path.

This happens because
the strong magnetic field of the planet

slows down the dust particles.

In a far future, the rings will therefore
be swallowed up by Jupiter.

When we take a close look at the planet,

the first thing we notice
is the colourful atmosphere,

that looks somewhat like marbled rock.

This hull of gas makes up almost
the entire planet,

because as with all gas giants,

it becomes liquefied due
to the rising pressure on the way down

towards the planet's core.

This core consists of a mixture
of rock and ice,

and is about twenty times
heavier than our Earth.

This means once again,
we have nowhere to land on Jupiter,

so let's take an even closer look
at the atmosphere instead.

The most distinctive feature
is the cloud bands

that run in parallel to the equator.

Then there is the "Big Red Spot,"

a gigantic whirlwind
with a fixed position.

Its diameter is three times that of Earth,

and inside, the wind speeds
reach to 375 miles per hour.

Its existence was already recorded
in the year 1664.

Sending our NOMAD through
the outer atmosphere gives us a nice view,

as Jupiter has two sharply separated
cloud layers.

The reason for this separation
is differing temperatures.

No less impressive
is Jupiter's magnetic field.

Like all things Jupiter, it is gigantic.

It's 14 times stronger than Earth's
magnetic fields,

and its outer measurable limits
almost reach out to Saturn.

Of course, you cannot directly see
a magnetic field,

but interference with Jupiter's main moons
causes gigantic auroras at the north pole.

These four moons orbit Jupiter
fully enclosed by its magnetic field,

and are thereby shielded
from solar radiation.

Because of this,
the moons seem particularly inviting.

However, it took some real effort

to make our NOMAD's electronics work
in this environment.

That dealt with, let's take the tour.

At one million miles away from Jupiter,
Callisto is its most distant moon.

Actually, it looks pretty similar to our
own moon,

so I guess it's enough if we do a flyby.

Closing in on Jupiter,
we come across Ganymede next.

At over 3,700 miles in diameter,

this is the biggest moon
of our solar system.

It is even considerably larger
than the planet Mercury.

With its crater-littered surface
and the very thin atmosphere,

it also looks quite a bit like Mercury.

Still, it is a bit more interesting,
as far as looks are concerned.

Due to a mixture
of different surface area types,

it almost looks like it's been painted
with a very wide brush.

The next stop on our little tour is Io.

It orbits Jupiter
at a distance of 250,000 miles

and needs 42 hours to complete one orbit.

Even when looking from quite a distance,
you might describe it as a hell of a moon.

After all, the most distinctive structures
on its surface are volcanoes

and lava pools of gigantic dimensions.

There are seas of liquefied sulphur,

an element covering the entire planet
in various aggregate states,

from gaseous to liquid to solid.

This gives Io
a pretty colourful appearance,

with yellow being the predominant hue.

Surface photographs of Io
separated by only 20 years

show vastly different features.

On taking a closer look,

it becomes clear why its surface
is subject to constant change.

Of all bodies in our solar system,
Io has the most active volcanism.

The constant eruptions hurl lava

that is 2,000 degrees Fahrenheit
up to 180 miles into the air.

Aside from the lava pools
that are up to 250 miles wide,

there are also rivers of lava,

with temperatures of up to
3,500 degrees Fahrenheit

that flow hundreds of miles.

Despite the heat generated
by the volcanoes,

the average surface temperature of Io
is a low -236 degrees Fahrenheit.

I guess you could really call this
a harsh environment,

so if there should be any life on Io,
it's definitely got to be tough as nails.

Still, it's getting even more exciting.

We're closing in on Europa.

This moon lies 370,000 miles
away from Jupiter

and is covered with an ice crust
six miles deep.

This makes Europa look a lot like
Neptune's moon Triton.

Europa has a very thin atmosphere,
mostly made up of oxygen.

The red colouring
is caused by accumulation of minerals.

Europa's surface is among
the smoothest and youngest.

There are hardly any structures
that rise more than 300 feet

above the surrounding grounds.

Still, the network of chaotic ridges
and trenches is visually striking.

These so-called "Linea"
are up to 12 miles wide

and are strongly reminiscent
of ice fields on Earth.

Since the positions
and alignments of the Linea

cannot be explained
by geological processes,

they are a clue to one of the biggest
secrets of our solar system:

under Europa's icy crust
lies a vast ocean of liquid water.

This water interacts with the surface,
and the Linea are created.

Due to the irregular orbit of Europa,

strong tidal forces affect the ice
and heat up the inside.

So, it's time to do
a couple of miles of drilling

and to activate NOMAD's submarine mode.

As I said, the prerequisites
for the creation of life

are organic chemicals, water and warmth,

and all of this is theoretically available
in Europa's ocean.

On Earth, there are examples of organisms
that are totally independent of sunlight.

Such lifeforms
are only very primitives of nature,

like microbes or endoliths.

Yet, there are theories that suggest
that cosmic radiation may cause

release of oxygen in Europa's water.

The waters here
could already be more oxygen-rich

than our Earthly oceans,
which would mean--

What the? Did you see that? What in--

[roaring]

I'm sorry about that, but I'm afraid
I just couldn't resist a little joke.

Of course, this was only fiction,
but maybe after all,

not that far from reality.

Speaking for myself,

I'm absolutely sure that
somewhere out there, there is life.

Maybe even intelligent life.

And having heard about
distant galaxies today,

you may be intrigued about the possibility
of life elsewhere yourself.

So, I'll just let more images
argue my case.

Look at this image.

At first glance, you might think
it's a typical snapshot of our night sky,

with a lot of stars.

Actually, this isn't too far off.

The surprise lies in the fact

that it represents only
an incredibly small fraction

of what is actually floating around
in our night sky.

To be precise,

it's only a tenth of the space
the moon takes up in our field of view.

And what we see shining there
aren't just stars,

most stars would be much too small
and dim to be seen here.

No, all these little lights
are full-blown galaxies.

Just imagine this.

Behind a piece of our
sky about the size of a fingernail,

there are more than 10,000 galaxies.

And I'm talking galaxies,
not solar systems.

Each of these contains up to 100 million
solar systems, just like our Milky Way.

So even if sceptics are right
in their assumption

that there is no other case of intelligent
lifeforms in our entire galaxy,

what about the probability when
we multiply these chances by a trillion?

These odds are why no one
can rip me from my belief.

You've probably noticed that I'm a big fan
of our planets, moons,

and the secrets
waiting to be discovered in space.

I hope that I've been able to pass on
some of my enthusiasm.

Yet, it saddens me a bit to see

that the golden days of space faring
seem to be over.

I hope that you will reflect
on what you've learned.

Maybe even ponder a bit
on the idea of possible aliens,

or just acknowledge the place
of our little Earth

in this gigantic cosmos.

On that note, I'm sorry to say
it is time to leave.

It's been a pleasure being your guide
around the cosmos,

and I hope you've learned a great deal.

So for now, I'll be saying goodby--

[machine beeping]

[chuckles] Sure.

NOMAD asked me to tell you goodbye, too.

So, take care.
From me, Matt Saberneck and…

-[machine beeping]
-…NOMAD.

See you again. Bye-bye.