All language subtitles for How the Universe Works - 2X02 Megastorms - The Winds of Creation

We live in a violent Universe.

Planetary winds rage
at six times the speed of sound.

Lightning storms stretch
for thousands of miles.

Dust storms
engulf entire worlds.

We can have planetary storms

the like of which we never see
here on the planet Earth.

The largest storms

can be on the scale
of entire galaxies.

Sometimes those massive stars
can literally explode.

The universe is a chaotic place.

Earth has storms.

Other worlds have megastorms,

storms almost too vast
to imagine.

Yet from the violence
emerges a ray of hope.

We kind of owe our existence
to these sorts of events,

these sort of galactic storms.

Could megastorms
be necessary for life itself?

On some planets,
storms are impossible.

Superheated Mercury is too small
and too close to our Sun

to have
a significant atmosphere.

And no atmosphere
means no storms.

But move out away from the Sun,

and we find worlds with
turbulent, chaotic atmospheres.

They can spawn some of the most
awe-inspiring megastorms

in our solar system.

This is Venus,

a planet completely shrouded
with clouds.

Winds rip around
the upper atmosphere

at over 300 miles per hour.

About 35 miles
above the surface,

the winds are whipping around
in a ferocious pattern

that basically carries
the cloud features

around the entire planet
every four days.

Venus is closer
to the Sun than Earth,

and it's heat from the Sun
that drives the wind.

The circulation
pattern of Venus' clouds

is actually quite simple.

There's a warm side of Venus
and a cold side.

And as air warms up and rises
on the day side of Venus,

it spreads around
to the night side.

So, there's
this continuous current

that's actually
quite a lot simpler

than the atmospheric circulation
on Earth.

Venus' winds circulate faster

than the fastest hurricane
on Earth.

But they look very similar.

The Venus Express probe
captured these remarkable images

of the planet's south pole.

One of the great
mysteries of Venus

which actually had jaws dropping

in the halls
of many astronomy departments

is the fact
that we have hurricanes

at the poles of Venus,

especially in the southern
hemisphere, that have two eyes.

Not one eye, but two eyes.

Now, we've never seen this
before

on such a planetary scale.

Venus' double-eyed vortex

is 1,800 miles wide.

Two hurricanes
whirl around each other.

If you could descend
into the vortex of Venus,

something I would love to do,

at least with
a remote machine...

...I think you would see

some kind of a fantastic wall
of cloud

and this sort of twisting form

spinning around you
at ferocious speeds.

It would be quite a sight.

It's a mystery

how deep this raging,
spinning vortex goes,

but maybe this megastorm eye

descends
to the planet's surface.

Down here, permanent twilight
bathes a volcanic landscape,

and the atmosphere's
colossal weight

creates immense pressure.

The atmospheric pressure
on Venus

is about 100 times
that of the Earth.

Think of taking a car,

squeezing it down
to about a square inch,

and putting it on every
square inch of your skin.

You'd be flattened
within a fraction of a second

because of all that pressure.

Venus' dense atmosphere

creates one of the strangest
megastorms imaginable --

four miles per hour winds

with the force of a hurricane.

The winds on the surface
of Venus are actually very slow

because Venus has
a very slow rotation rate.

It takes Venus
about eight months

to turn once around
with respect to the sun.

The crushing
atmospheric pressure

rams gas molecules
together so tightly

that they feel
more like a liquid.

A gentle 4-mile-an-hour breeze
packs a brutal punch.

It's like a hurricane
in slow motion.

Winds on Venus

are totally unlike anything
we see on the planet Earth.

You would almost feel,
like, a molasses effect.

It'd be quite difficult

to simply walk and run
right through the wind.

Venus' surface is so hostile

that life is impossible here.

But the upper atmosphere's
faster winds

hold an extraordinary
possibility.

I harbor this --

I don't know if I would call it
a hypothesis

or a scientific fantasy.

But I do think it's plausible

that there could be
some kind of life living

in the clouds of Venus.

There are certainly
energy sources.

There's sunlight.

And there are certainly
nutrients.

There's carbon,
there's hydrogen,

there's oxygen --

all the stuff we think of
that you need to make life

exists in the clouds of Venus.

Earth's upper
atmosphere is full of life --

microscopic bacteria
drifting on the wind.

Could Venus be the same?

Perhaps one day we'll send
a probe to find out.

Leave Venus behind,
and the next planet is Earth.

Here, too,
the weather gets extreme.

We are bombarded by tornadoes...

hurricanes...

and these -- dust storms.

On Earth, they're localized.

But on the next planet out...

they engulf an entire world.

Over 100 years ago,

astronomers thought
they had found life on Mars.

A dark wave spread from the pole
towards the equator.

They thought it was
springtime vegetation

spreading across the planet.

They were right
about the season.

Mars tilts
at roughly 23 degrees,

like the Earth,

so you would have summer,
fall, winter, spring,

like the seasons.

Seasons bring weather.

The shadow astronomers saw

was actually dark rock uncovered
by a violent dust storm.

It's all because of the way
the planet tilts.

The Earth takes one year
to orbit the Sun.

In January,

the northern hemisphere
leans away from the Sun,

and we get our winter.

In June, it leans inwards,
our summer.

Mars has gigantic
planetary dust storms

the like of which we've never
seen here on the planet Earth.

Mars has
around the same tilt as Earth,

and springtime means storms.

The martian surface vanishes

under a cloud
of raging dust particles.

On Earth,
we get dust storms, too.

They can be devastating,
swallowing entire cities.

July 5, 2011, Arizona.

An unstoppable
5,000-foot-high wall of dust

smashes into Phoenix.

Day turns to night.

Thousands of tons of dust
settle over the city.

But the disaster
stays in one place.

Mars' dust storms
can engulf the entire planet.

On Mars, when dust gets
kicked up once, it lands,

it can get kicked up
again and again.

The dust is reusable.

On the Earth,

when the dust gets kicked up
and then finally settles out,

it's probably gonna settle out
into the ocean,

where it's gone for good.

There's nowhere on Mars

where there isn't ready dust
and sand to add to that storm.

So, these storm systems
can kick up

and last weeks or even months.

Mars' incredibly dry atmosphere

contributes to the storms'
size and power.

In the case of the Earth,

dust that gets up
into the atmosphere

is rapidly washed out
by the rain

and gets into the ocean.

In the case of Mars,

there's no comparable rain
to wash the dust out.

So, once the dust gets
into the atmosphere,

it just sits there

until the particles
by themselves

are able to slowly settle out.

A lack of rain

allows Mars' dust storms
to cover the planet.

But dust storms on Mars

can be equally spectacular
on a much smaller scale.

NASA rovers captured
these extraordinary images --

dust devils sucking up fine,
dry, iron-oxide dust.

The biggest dust devils can
reach six miles into the sky.

They pump fine particles
high into Mars' atmosphere,

creating a haze of dust

that may help control
the planet's dry climate...

and lead to
a planet-wide megastorm.

Even on Mars,
dust storms this big are rare.

Astronomers
have detected just 10

in the last 100 years.

What the ancient astronomers
mistook for life

was a megastorm.

But even a planet-covering
dust storm

is dwarfed by the weather

on the next planet
out from our Sun.

This is the giant
of our solar system --

Jupiter.

Jupiter is gigantic.

It's 2½ times more massive

than all the other planets in
the solar system added together.

It's also home
to gigantic megastorms.

Jupiter's high-speed rotation

drives vast bands
of counter-rotating clouds.

Colossal storms build
along the boundaries.

And this is the biggest
of them all,

the oldest storm
in the solar system.

15,000 miles across
and over 300 years old,

the great red spot.

Around the edges,

turbulent winds rage
at over 300 miles per hour.

The great red spot
is a giant vortex,

meaning that,
in the case of the red spot,

it has a high-pressure center

with winds that swirl
around the outer edge.

So, in that sense,

the great red spot is
a little bit like a hurricane.

A hurricane with a difference.

On Earth,

hurricanes feed
off heat from the ocean.

When they hit land,
they start to die.

So, on average,
they last only about a week.

Jupiter does not have land.

Jupiter is
a completely gaseous planet,

and the friction there
is very weak.

And so a vortex,
like the great red spot,

can last indefinitely.

There's nothing to slow it down.

To keep going,

all the red spot needs
is a power source.

On Earth, ultimately,
that's heat from the Sun.

But Jupiter's five times farther
from the Sun than us.

Heat from the Sun is not enough
to drive the red spot.

Instead, Jupiter has
an internal power source --

its own immense gravity.

In 1995, NASA launched a probe

straight toward
the giant planet's heart.

It plunged into Jupiter's
upper atmosphere

at over 106,000 miles per hour.

As it fell,

the planet's crushing gravity
ratcheted up the pressure...

10, 15, 20 times
what we feel on Earth.

Winds gusted
to over 400 miles per hour.

The probe gave out
just 100 miles in,

crushed by pressure

and fried by the incredible heat
the pressure generated.

Had the probe made it deeper,

it would have reached
a vast, silvery ocean.

Intense pressures here
turn hydrogen gas

into a churning,
metallic liquid,

superheated to over
40,000 degrees Fahrenheit.

Jupiter's interior pumps out
about twice as much energy

as the surface gets
from the Sun.

This is Jupiter's power source,

the heat that drives
its massive megastorms.

All of the convection,
all of the heat

comes from the hot, dense
interior of the planet itself.

So, the bands of clouds
that you see

that are even counter-rotating,
going in different directions,

those are all driven

by the internal heat
of Jupiter itself.

Jupiter's internal heat

drives its violent megastorms.

But the giant planet may hold
clues to an even deeper mystery.

Could life exist
on other worlds?

NASA's Cassini probe
studied Jupiter

as it flew past
en route to saturn.

It made an extraordinary
discovery --

strange white clouds just north
of the great red spot.

Clouds just like the clouds
on Earth --

droplets of liquid water.

Could Jupiter have
the ingredients for life?

The question of life
on the giant planets

is an interesting one.

You have many
of the ingredients for life.

You have sunlight coming in.

There's liquid water,

at least in the form
of cloud droplets.

On the other hand, if life
can easily exist in clouds,

you might expect
that bacteria and algae

would populate
the clouds on Earth

and the clouds would be green.

We don't see that on the Earth.

We do see microbes
at many altitudes

throughout
the Earth's atmosphere,

but they seem to largely be
blown off of the surface.

It's likely that life on Earth

began on a solid surface.

But could life evolve
without one?

There's no surface on Jupiter,

and so that makes it difficult

for organisms to have
a constant source of water.

So, if you imagine yourself

being a little bacterium
inside a cloud droplet,

you're gonna be in deep trouble

when that cloud droplet
evaporates.

Whether life exists
in Jupiter's clouds or not,

gas giants like Jupiter
and its neighbor Saturn

have all the right
ingredients --

water, heat,
and one other vital element,

a spark...

...lightning
on an unimaginable scale.

These haunting images
are from NASA's Cassini probe.

Its mission --

to explore
one of the solar system's

most awe-inspiring planets...

Saturn.

The probe reveals
Saturn's rings...

moons...

and the planet itself
in near-perfect detail.

Chaotic bands of cloud
race around Saturn

at more than
1,000 miles per hour.

Finding storms here
was no surprise.

It's a planet of storms.

But this was astonishing.

A bolt of lightning --

a gigantic thunderstorm
on an alien world.

Lightning creates

some of the most spectacular
weather on Earth.

Electrical tension builds
between the top and bottom

of a vast 55,000-feet-high
storm cloud,

a maelstrom of water vapor,
rain, and ice.

Tiny ice crystals drive up
past hailstones falling down.

As they rub past each other,
it builds up a charge.

When the strain gets too great,
you get an electric spark.

On Earth, the average lightning
storm stretches 15 miles.

On Saturn, they can reach
around the whole planet.

There are examples of lightning
storms on Jupiter and Saturn

where the anvil cloud --

in other words, the big cloud
at the top of the storm --

starts small and grows
to be 20,000 kilometers long.

That's the size of the Earth.

On Saturn, we registered
one lightning storm

that was 10,000 times greater

than any lightning storm found
on the planet Earth.

Lightning is hotter
than the surface of the Sun.

The atmosphere
literally explodes...

...the sound we call "thunder."

On Earth,
it's the sound of new life.

Lightning seems
scary and destructive,

but actually it's very
productive for life on Earth.

And the reason why is

because of its influence
on atmospheric chemistry.

Every bolt
literally burns the air.

When you have
a lightning discharge,

you get this very
high-temperature,

very energetic plasma,

and that breaks up the nitrogen
molecules in the atmosphere,

frees up those nitrogen atoms

to enter into other kinds
of molecules.

And those nitrates
formed by lightning

allow nitrogen
to go into the soil

as, basically, fertilizer,

enter into plants,
enter into the life cycle.

So, it's the lightning
that frees up nitrogen atoms

in the service of life on Earth.

Earth experiences

8 million lightning bolts
every day...

...helping life evolve
and colonize the planet.

But for Saturn, lightning alone
may not be enough.

There's nowhere
for alien life to live.

One place in our solar system
may solve that problem --

Saturn's moon Titan.

It has an atmosphere.

It has lakes
of liquid methane...

....and its own bizarre brand
of megastorm.

Saturn is
almost 900 million miles

from the Sun.

This far out,
orbiting the Sun takes time.

Saturn's year
is nearly 30 Earth years long.

Right now, it's spring,
and things are heating up.

Now we're moving into
the summer cycle of Saturn,

so the atmosphere
is slightly heating up.

Even as distant as Saturn is
from the Sun,

we've got a little more energy

and we're seeing
the most spectacular storms

we've ever observed on Saturn.

After years of frozen silence,

Saturn is coming alive.

Scientists have waited
nearly 15 years

for the Sun to light up
its north pole,

to reveal extraordinary details

about one of
the strangest megastorms

in the solar system....

Saturn's unique hexagon storm.

A hexagonal pattern,
how can that be?

In mother nature,
we have jagged objects.

We don't have geometric figures
arranged precisely,

especially on a gigantic
planetary scale.

However, there's some theories.

If I take a bucket of water
or a bathtub

and simply vibrate it,

I get waves, waves that travel.

But there's another kind
of wave.

You have traveling waves,

but then you have
stationary waves.

Inside a bucket of water,
you can get resonances.

Water pulsates like this.

And you can also get them
to pulsate in a circle like this

to create regular patterns.

These are called
stationary waves,

and we think

that this mysterious
hexagonal pattern on Saturn

is a hexagonal standing wave.

The megastorm
at Saturn's north pole

is a wind that travels
at hurricane speed,

cornering sharply six times

as it races 'round the planet.

The central clearing is so big,

you could fit
four Earths inside.

What lies beneath its surface
is a mystery.

As Saturn warms
from spring to summer,

another world comes alive, too.

One of Saturn's moons, Titan,
is warming up.

And with the warmth
come the storms.

One of the most interesting
moons in our solar system

is Titan.

It's straight
out of science fiction.

It's an object with yellow skies
and methane clouds

that is truly remarkable.

NASA's Cassini probe

reveals Titan
in unprecedented detail...

a thick, dense atmosphere,

vast mountain ranges,

lakes of liquid methane.

And this --

an arrow-shaped band
of white methane clouds

moving over its surface.

When the clouds drifted
over a dusty, open plain,

seen here as a dark patch,

the dark patch of ground
beneath the clouds grew larger.

Scientists believe

liquid methane
drenched the surface.

A spring rainstorm, Titan style.

Rain on Titan, if it exists,

would be very different
from rain on the planet Earth.

First of all, the gravitational
field is very weak,

so you would actually see
raindrops falling

very slowly at you.

Also, the size of these droplets
could be much larger.

But don't get caught
in a rainstorm on Titan.

Those droplets are awfully cold.

Titan's methane monsoon

sweeps across the moon.

Weak gravity creates ultra-cold,
hazelnut-sized raindrops.

An alien world
with truly alien weather.

These slow drops
have carved valleys and lakes

much like ours on Earth,

a slow-motion megastorm.

But fly even farther out
through the solar system,

and you find storms
that are altogether faster.

This is super-chilled Neptune.

The temperature never gets
above 300 degrees below zero.

Neptune is one
of these giant planets.

It's much larger than the Earth
and has a very thick atmosphere.

It's about 2 billion miles out
from the Sun.

So, you really might expect,

since it's that far
from the Sun,

it would be very cold
and not have very much weather.

But in fact,
Neptune is very dynamic.

It's got tremendous
weather patterns.

Despite its incredible
distance from Earth,

astronomers can get close

to Neptune's
turbulent atmosphere...

with a little help from this.

The Keck Observatory,

14,000 feet up on the summit
of Mauna Kea in Hawaii.

It sits above Earth's clouds
and pollution.

The telescopes are so powerful

they could see a candle
on the Moon.

Neptune at first
appears featureless.

But a closer look reveals
white, high-altitude clouds

in the upper atmosphere.

It's a perfect opportunity
to track wind speed.

Measuring the time and distance

the clouds take
between two points

allows scientists
to clock their speed.

The Keck telescope
swings towards Neptune.

A series of shots
track the white clouds

as they move around the planet.

So, here we can take
several photographs

that show the positions
of clouds apparently changing.

You can measure the position
at one moment to be there

and at another time
a few hours later

to be in a different place.

Now, most of that change
in position

is due to the rotation
of the planet as a whole.

However, if you know
the rotation rate

and subtract that out,

that gives you
the motion of the clouds

relative to the planet.

That tells you the wind speed.

The results are shocking.

We're seeing
wind speeds on Neptune

of many hundreds
of miles per hour

up to 1,200
or even 1,260 miles per hour

for the very fastest clouds.

That's really phenomenal.

Neptune has the fastest winds
in the solar system.

So, what's driving this?

You need energy to make weather.
Where's that energy coming from?

And it turns out
it's coming from Neptune itself.

It does receive sunlight,

but Neptune actually radiates
away more energy --

a lot more energy
than it gets from the Sun,

which means
the interior is very hot.

Probably it means there's
radioactive material in there,

there's leftover heat

from when Neptune formed
4.5 billion years ago

that's very slowly leaking out.

And it's that
that's heating up the air

and driving
all of this circulation

and all of this crazy weather
that Neptune has.

Neptune's storms hit hard.

But the search
for truly extreme weather

takes us out of the solar system
altogether

into uncharted territory.

Out here, there are storms

that make even Neptune's winds
look like a breeze.

Katrina was just a sneeze

compared to the winds we have
on Osiris.

The search for megastorms

leads to alien worlds

whose violence
defies imagination.

Space is full
of stars and planets

where violence and chaos reign.

Astronomers scour the skies
for new worlds.

And the king
of the planet hunters

is Professor Geoff Marcy.

He scans the night sky

seeking new worlds
around distant stars.

Marcy's team
has instruments so sensitive

they can even predict
the weather

on these distant planets.

This is Osiris,

150 light-years from Earth,

a planet from hell
with matching weather.

Earth is 93 million miles
from the Sun.

It orbits the Sun in one year.

But Osiris is just 4 million
miles from its star.

Its year races by
in just 3½ days.

When Osiris passes
between us and its star,

starlight briefly shines
through its atmosphere,

giving us a glimpse of
conditions on the alien world.

And they waited until the planet
was in front of the star.

At that moment,
some of the starlight

passed through the atmosphere
of the planet.

They were able to do
essentially a chemical assay,

a chemical assessment

of the composition
of this atmosphere.

Osiris gets blasted
by the intense heat of its star.

Temperatures top 2,000 degrees.

Now, what that means is

that the environment
on that planet is,

well, hideous
for life as we know it.

But even more, the intense heat
causes the gases to expand,

and they have no place to go
but the backside of the planet.

Osiris is tidally locked.

The same side of the planet
always faces the star.

The other looks out into space.

The temperature difference
is immense.

Superheated atmosphere roars

from the bright side
of the planet to the dark

at nearly six times
the speed of sound.

In fact, the winds

will be something like 2,000
or 3,000 miles per hour,

enormous speeds
of these winds --

10 times, 20 times faster
wind speeds

than the strongest hurricanes.

Katrina was just a sneeze

compared to the winds we have
on Osiris.

Osiris is a brutal world,

too hot and too violent

for any kind of life
we could imagine.

But there are
even larger megastorms,

storms on the scale
of whole galaxies.

And these fast storms may be
the reason any of us are here.

The Hubble Space Telescope
captured this stunning image

of the Galaxy NGC 3079.

At its center, a super wind --

a storm on a truly cosmic scale.

It was triggered by an explosion
from a forming star.

This raging galactic storm
is about 3,000 light-years wide.

It has already raged
for around one million years.

Filaments
of 20 million-degree gas

tower above the spiral galaxy.

This cosmic megastorm

wreaks havoc
within its host galaxy.

We see bubbles and jets

and formations of gas
falling into the galaxy,

colliding with galactic dust.

The gas from
the galactic megastorm

smashes into gas and dust
at the heart of the galaxy

and compresses it
into a swirling mass of matter.

Gravity takes over.

The compressed clouds
of gas and dust

get tighter and tighter.

The center
gets hotter and hotter.

Finally, it ignites.

Powerful winds from the new star
blast into space.

The whole cycle
begins over again,

and a new galactic megastorm
is born.

Around the fledgling stars,

dust and rock come together,

the birth of new worlds

with rocky surfaces
where life could begin.

And perhaps
the formation of life itself

may be determined

by how these gases swirl and
create super-galactic storms.

And if you have
galactic winds churning away,

then that would help
to distribute

the elements necessary for life
throughout the galaxy.

So, galactic storms may,
in some sense,

be one clue to the formation
of life itself.

Galactic megastorms
rage for millions of years.

Billions of years ago,

they may have created
new homes for life

in our Milky Way galaxy.

On every scale, storms are not
just a force of destruction.

They are linked
to creation itself.

The search for life
on other worlds

is also the search for storms.

When you disrupt the status quo,

you open all kinds
of possibilities

for things to reassemble
in different ways.

So, chaos or disruption
is actually an important factor

in the development
of complex systems like life.

A planet that might have
changes of seasons,

vulcanism, intense storms,

some environmental factors

that you might think
could be damaging to life,

in the long run
makes life stronger.

Earth has storms.

Other worlds have megastorms.

Whether it's lightning
on Saturn,

the turbulent atmosphere
of Jupiter,

or blistering temperatures
on Osiris,

vast, violent,
and deadly megastorms

could also be
the catalyst for life.