ALARM RINGS
Every morning when you wake up and start your day,
you might think the world around you hasn't changed much since yesterday,
but you'd be wrong.
Because while we're going about our normal day,
our Earth is altering itself in ways we couldn't even imagine.
We're going to spend 24 hours with our planet,
to watch what it's really getting up to in the course of an average day.
Across the globe, a new breed of scientists are showing us our home
as we've never seen it before -
an Earth that is constantly reinventing itself.
Things are always active.
The Earth is really living and breathing all the time.
Every second of every day, it's growing, shrinking and moving,
and each change has surprising consequences for our lives.
Every hour, the Earth is making mountains of new rock...
Never gives up, just never stops.
..in a way that is crucial to our daily survival.
By the time you've stopped for lunch, tonnes of dust from
the Sahara will have landed in a faraway ocean.
That dust is still coming.
Every day, yeah. All the time, every day.
Dust from a desert that will help give us the air we breathe.
And before we go to sleep,
glaciers will have changed the face of the planet,
and helped trigger a mass movement of animal life.
So, this is enormous.
This is like the largest migration on Earth.
In this programme we'll reveal the myriad different ways
in which the planet transforms itself every single day...
Whoa!
..and how they come together to make life on our world possible.
You can forget about the Earth taking millions of years to change,
because it is changing as fast as we are.
Quite a lot can change in a day.
Families can grow, you can move house,
fortunes can be won or lost.
But a single day can be just as transformative for our planet.
Even something we think of as solid and unchanging,
like the land we stand on - it's not.
Across the world, land is being made and rearranged
on an extraordinary scale, on a daily basis.
And if you live here in Stromboli, off the west coast of Italy,
you can see it happening.
Here, they wake up to a new view every morning.
Stromboli's almost continual eruptions might shake up the locals,
but scientists are drawn here despite the obvious dangers.
Although as a geologist I shouldn't really be nervous, there's still
something about being so close to so much heat and energy.
For geologists Chris Jackson and Giuseppe DeRosa,
this is the place to study what volcanoes are really capable of.
You feel all of the ash raining down
from that last eruption now, can't you? Yes.
Gosh! HE LAUGHS
Wow. A giant eruption there, lots and lots of lava coming out.
Huge volumes just being blown out of the top.
Lava that, in fact, plays a vital role for all of us on the planet,
because this lava is about to become land.
It's amazing seeing these car-sized lava bombs being hurled out of
this volcano.
Magma bursting to the surface, becoming lava, becoming rock,
and ultimately becoming land.
You can see all down the flanks,
that orange glow of lava which has just been kicked out.
Over the course of just 24 hours, this volcano can throw out
enough lava to fill 80 Olympic-size swimming pools.
Volcanoes build land in different ways,
depending on the type of stuff that's coming out.
Lots of different minerals in here, this green colour's...
Yes, this is all living. Yes.
The mineral content of the lava makes it behave in different ways.
Basically, there are two types.
The first, lava low in a mineral called silica
that can build big areas of land quickly -
the runny stuff.
It very quickly runs all the way down the sides and builds new land
all the way around the edges.
On the islands of Hawaii, the runny stuff spills into the ocean
and turns to rock,
creating an average of six square metres of new land every hour.
Half a tennis court in a day.
So, you have the runny lava,
but there's also the sticky stuff...
It's too sticky to even come out.
..which has a higher silica content
and builds land in a more explosive way.
LOUD EXPLOSION
Like, some of the things that are coming out right now,
these bombs of lava rolling all the way down the sides of the volcano
and building the crater itself.
Over thousands of years, the sticky lava erupting from this volcano
built this island up out of the sea,
and formed its classic cone shape.
But sometimes, a volcanic island can appear almost overnight.
In 2014, this volcano in Tonga sprang out of the Pacific Ocean,
building 60,000 square metres per day.
Right now, as you're watching this,
between 10 and 20 volcanoes are erupting, spraying out new land
across the surface of the Earth,
making a real difference not just in millennia,
but in minutes.
In fact, in just one hour, the time it takes most of us to get out
of the house, it's estimated the planet has made
3 million cubic metres of lava.
Enough to build an island 200 metres tall.
Without this process, the people of Stromboli wouldn't have a home.
But then again, neither would we.
Every day, you have got volcanic activity creating new land.
But every day, you also have wind
and water eroding land away.
Now, if volcanic activity didn't create land as quickly as it does,
then erosion would win that battle and the world would be left
as one giant ocean.
So, volcanic activity keeps us all above water,
but it's only possible because of the heat that's generated
deep beneath our feet.
We have two sources of heat in the Earth -
primordial heat, that's coming from the core, white hot,
6,000-7,000 degrees Celsius, so, similar to the surface of the sun.
Outside of that region, here in the mantle and in the crust,
we also have heat that's being produced by radioactive decay.
This heat produced by radioactive decay drives volcanic activity
and is best explained by popcorn.
A heavy element like uranium
becomes lighter by emitting a particle from its atomic nucleus.
As it does that, a burst of energy is released in the form of heat
and it is that heat that drives the geological processes deep beneath
our feet and at the Earth's surface.
Ooh!
Every time a heavy atom decays into a lighter one,
there's another burst of energy.
It's the very same process that we use to create nuclear energy.
And it's everywhere.
The smaller dark spots on this map are nuclear power plants.
Everywhere else,
radioactivity is coming from atoms decaying underground.
And it all adds up.
In just three hours, before you've even had your mid-morning coffee,
the Earth has generated heat energy from radioactive decay
equivalent to 4,000 Hiroshima bombs.
That's about one every three seconds.
So, every minute of every day, the Earth changes from within.
But once land is made, it doesn't stay put.
As we continue on our day, it's time to see how the land is being warped
and moved right under our noses.
First, we have to look to the water.
In particular, the tides.
We're all familiar with sea levels going up and down twice a day.
Well, every 12 hours 25 minutes, to be precise.
But what's less obvious is that this process is changing the shape of
the planet, and it's all caused by the moon.
Here in the Amazon, this shape change is so dramatic,
you can actually see it,
and they've even given it a name...
..the Pororoca.
Pororoca, meaning great roar, is in fact a tidal bore.
When the tides are at their highest, the water rushes into this stretch
of river so fast, it creates a wave large enough to surf,
and they do.
Woohoo!
Other than the piranhas and hidden logs in the water,
this is perfectly safe.
But in fact, it's not just the water that's getting pulled out
of shape by the moon.
We can't forget about the other 29% of the Earth's surface.
You know, the stuff we walk on.
Every person knows that there are tides in the ocean, but what many
people don't realise is that the moon also causes tides in the Earth,
so what are called solid earth tides.
We can now prove that the moon moves rock as well as water,
causing a tidal bulge in the very land we stand on, which is
up to 50 centimetres high.
Solid earth tides, or rock tides, they can be measured with GPS.
They cause the GPS station to go up or down, so we can measure
how high the stations are rising all along the globe.
And this is happening about twice per day.
Which means that in about six hours' time, I'm actually
going to be up here.
Now, normally, I don't need an extra 50 centimetres in height,
but I'm embracing change today, so I'm going to go with it.
You'd think you'd notice these waves of solid earth,
but they happen over such a huge area that they are
imperceptible to us.
But that doesn't mean they do not affect us.
In fact, research suggests that earth tides can trigger earthquakes.
If earthquake faults are really close to failing and creating
an earthquake, then this tiny change may be enough just to tip that fault
off to failing.
By the end of the morning the moon's pull on the Earth has caused
a half-metre wave of solid rock
to travel 9,000km around the planet,
and you hardly even felt a thing.
The changing shape of Earth has another side effect
you might not have clocked.
It makes every day a bit longer.
Let me show you what I mean,
but I'm going to need something for this...
Ooh! Guys, can I borrow your ball for a second?
Handy.
Now, this is going to represent our squashed Earth
spinning on its axis.
Going to need a moon, too, though. Guys, have you got anything smaller?
Thank you.
Now, this tidal bulge stays ever so slightly ahead of the moon
at any one point.
The moon is acting almost like a brake on a bicycle wheel,
slowing down the spinning of the Earth and making our days
ever so slightly longer.
Throughout our morning, the moon has been slowing down
the Earth's spin,
with a force equivalent to 6,000 jumbo jets,
and has caused a tidal bulge to travel through water and rock,
What with tidal bores, earthquakes and land waves,
you might think that the moon's influence on us isn't a great one,
but the chances are that without it, none of us would even be here,
because in amongst everything else that the moon does,
it also stabilises the Earth spinning on its axis.
Without the moon there, the Earth would be wobbling all over
the place, which would change our seasonal relationship with the sun,
make the climate completely different and quite possibly mean
that the conditions never arise for complex life to evolve.
Can we get the ball back? Oh, yeah, sorry.
But when it comes to moving land around every day, the moon
has nothing on the Earth itself,
and yet our planet's work goes largely unappreciated.
Well, we all know that feeling.
The Earth, if it could talk, would probably agree with me,
because one of the barely visible things that it does every single day
may well have given birth to some of humanity's greatest civilisations.
This is the Sahara.
Morocco, to be precise.
And in this part of the world, land doesn't just move,
it can actually fly.
It's stunning, the landscape here is peaceful and remote,
but at the other way, it's dynamic.
You get to experience how nature is moving every day.
Geologist Charlie Bristow spends his time trying to figure out
how solid earth can cross an ocean.
The story begins on a dried-out lakebed.
How dry?
It's very dry. Very, very dry.
And this isn't just any old mud.
It's special.
This place appears dead, there's nothing here,
it's dried out, it's completely desiccated.
But the lake was here
and in the lake, there were little animals living here.
There's something called an ostracod, a little crustacean,
they're kind of cute little things.
And their remains are still there,
so within the mud, there are nutrients.
Nutrients that are about to find themselves
on the other side of the world.
Hello, Veronica.
Hello.
I'm Veronica Llaneza.
I'm Ramon Llaneza.
Ready to go dive?
We decided to take a trip to the Bahamas and it was a four-day trip
and it was pretty amazing.
This was not your average father and daughter day out.
Veronica and Ramon are technical divers and were exploring
an underwater cave system - not for the faint-hearted.
Out of nowhere, you see this hole.
A small hole. Yeah.
And then it opens up to these beautiful caves
with all of these stalactites and stalagmites and it's just beautiful.
Alien world, an alien world. Yeah.
Deep into the caves, something caught their eye.
Something that didn't belong.
Suddenly, you start to see pink. Yeah.
And red.
You would see this red dust.
It's very, very fine.
I said, "What is this, where is it coming from?"
The answer is far from what they might have expected,
because this is exactly the same stuff
as Charlie Bristow was turning up
6,500 kilometres away on his dried-out lakebed in the Sahara.
People say, how do you know that that's from the Sahara?
How do you know?
A lot of geology is detective work, so in order to link the dust
sediments from the Sahara with those that were found in the Caribbean,
you can use a variety of rarer elements found in minute amounts.
They're good for fingerprinting the dust and show that the dust
that leaves Africa is the same as the dust that arrives
in the Caribbean.
But how does this nutrient-rich, rock-hard, sun-baked mud take off
and fly across an ocean?
That's what Charlie has now figured out.
And it starts with the wind,
which blows over this desert almost daily,
and is strong enough to make Saharan dunes some of the fastest moving
land on Earth.
Wind usually blows from one direction,
over the windward side of the dune
and then it deposits it on the leeward side of the dune.
This is making little avalanches down the front of the dune,
and these dunes really motor.
Get a really strong howling gale and that will drive the dune forwards,
maybe over a metre in a single day.
They're like the F1 cars of the dune world.
Sorry. Made a bit of mess!
Fast moving, maybe, but the sand in these dunes isn't about to take off
and cross the Atlantic - it's too heavy.
But it is going to help send the nutritious mud in this lakebed
on its way west.
Obviously, we need the wind in order to transport it,
but it helps to have that third ingredient of the sand to sandblast
the surface and break it up.
Turning this mud into a fine dust.
So, in this hand, I have got some great big chunks of lakebed,
otherwise known as brown sugar,
and in this hand I have got some lakebed that has been smashed up
into tiny little bits by sandblasting.
And me, I'm going to be the wind.
This process of sandblasting is called saltation,
and it's really the key behind launching
great big chunks of earth into the sky.
Carried by the wind, the fine nutritious dust rises
thousands of metres into the atmosphere and then the trade wind
carries it west across the Atlantic Ocean.
Nasa satellites have measured that each day,
half a million tonnes of it leaves the Sahara and heads west.
Some of it arriving here in the Bahamas.
That dust came and is still coming all the time, every day.
But most flying further west, where it finally comes back to ground and
fertilises the Amazon rainforest, the lungs of the planet.
When you have this red dust in your hand and you think about where it's
come from, it makes you think of who else grabbed this or touched this.
That's just amazing and it's happening every day.
By six hours into your day, 125,000 tonnes of dust
will have become airborne and left the Sahara.
And in those same six hours,
25,000 tonnes of dust will have landed here in the Amazon.
But this isn't the only place receiving a daily dose of nutrients
from far away.
And when you plot them on a map, they tell the story of humanity.
So, I've drawn a map of the world here for you.
It's not my best work, but I did do it upside down,
and above here, it's almost like you've got this invisible
conveyor belt that's depositing this stuff in northern China,
across the great plains of America, also all over Russia,
and in Central Europe, too.
And it's no coincidence that these really are the places
where some of our greatest civilisations were born.
Because the so-called lowest soil has provided fertile ground to feed
all these huge populations and really to power some
of our most innovative minds.
Oh, I didn't think you'd mind...
OK...
If wind can move lakebeds and feed civilisations,
just imagine what solid ice can do.
Glaciers can break out the nutrients from the toughest of rocks,
a process which not only changes the landscape, but helps us
all breathe more easily.
They're incredibly beautiful
and when the sun lights the ice and creates all these beautiful colours,
it is extremely emotional, actually, to get to work with this.
Now, when we say glacial, we tend to mean slow,
but Heidi's measurements prove we've got glaciers wrong.
These glaciers can move at speeds of up to 70 metres per day,
so you can see the whole thing moving in front of you.
This is incredible.
So, what happens when a trillion-tonne block
of fast-moving ice meets the land beneath?
There's only one way to find out - get under one.
Local guide Snorri has found a way down to the very base
of this glacier in Iceland.
What a cool cave!
Quite beautiful, huh? That's awesome.
Really stunning colours.
I like how it changes.
And you get these pockets that are formed by the wind, scallops.
It's fantastic, isn't it?
It's incredible to get access to the belly of a glacier,
to really be inside it.
You can feel that the glacier's alive here.
It's cool, there are rocks inside.
Yeah, exactly, all these little sediments and pebbles
that are being carried by the ice,
and glaciers are these massive conveyor belts constantly moving
forward and reshaping the landscape around them.
So, there's a lot happening even right now, yeah.
And the clue to how these huge blocks of ice manage to move
and grind down mountains
is all around - water.
So, ice, when it's really dry and cold,
struggles to move,
but as soon as you get a little bit of water at the base of the ice,
as soon as it starts to melt, then very quickly, the ice can start
sliding over the bedrock.
And you can even hear the moving.
ICE RUMBLES
What you're listening to is an actual recording of a glacier
as it ploughs its way through a mountain range.
Glaciers are very noisy.
They're very noisy because actually, they're constantly moving
and the sounds you can hear are really special.
It can be like gunshots, it can be the ice cracking,
it can be the noise of the ice against the rocks,
the kind of crashing sound, and when you're quiet for a few minutes and
you start to really being careful and listening to these sounds,
you realise that there's a lot happening.
Minute by minute, these giant blocks of ice are breaking mountains
into boulders, boulders into rocks,
and rocks into dirt.
A global system totalling 200,000 glaciers, a combined bulldozer
bigger than France, working 24-hour shifts to reshape the land.
In the space of just seven hours, if you add them all together,
the world's glaciers grind out 2.5 million tonnes
of minerals from mountains.
Nothing glacial about that.
By lunchtime, quite a lot has happened.
A whole mountain's worth of new land
has spewed from the bowels of the Earth.
There's also a nutrient-rich dust cloud the size of a continent
that has left the Sahara and is heading across the Atlantic.
And all kinds of ice and water
that is slowly breaking mountains down into dirt.
And the result of all that is...
Ta-da!
A nourishing mix of minerals and nutrients that fuels
a whole new wave of daily change to life.
Cheers.
Oh, that's disgusting.
These are phytoplankton - a type of plant you won't have seen
they live in the ocean.
There, they thrive on a diet of nutrients from the Earth
and light from the sun.
Individually, they are small, but together,
they have a big effect on all of us.
Take a deep breath in...
..and out.
And another - in...
..and out.
One of those breaths was made by phytoplankton.
Together, they create more oxygen than the entire Amazon rainforest.
Trees...
..algae.
Luckily for us, phytoplankton are one of the most abundant forms
of life on our planet.
Satellite imaging shows how they envelop pretty much
the whole world.
And they're growing all the time.
In just eight hours, over 3 billion tonnes
of phytoplankton have been added to the world's oceans.
Gathered together in one place,
that is a mountain of plant life 1.5 kilometres high.
And this daily explosion of phytoplankton triggers
one of the greatest mass movements of animals on Earth.
This happens every day all over the world,
but only the most determined ever get to see it.
I'm very excited about it, because it's my first time
diving at night.
It's a better way for me to understand the behaviour.
Dr Claire Paris-Limouzy is a marine biologist
who's hitching a ride with a group of photographers.
So, are you ready? Yeah. It's getting dark.
They're going on what's known as a black-water dive.
For the photographers - Linda Ianniello and Noe Sardet -
it's a chance to capture a global feeding frenzy.
A lot of people think we're crazy - float in the middle of nowhere.
It's 500ft deep,
you don't know...is there a shark out there that you can't see?
You have to be aware and you have to be careful.
These black-water dives are a great opportunity to capture
video of these creatures.
Who's going first?
If you're afraid of the dark and afraid of the depths,
this is definitely not for you.
The divers are floating above 150 metres of pitch-black ocean...
..waiting for creatures to rise from the abyss.
Tiny animals called zooplankton rise from the deep every night
to feed on the phytoplankton
that exploded in number during the day.
When I see the plankton, this incredible colour and light
and movement and all the energy that is there, it's extraordinary.
At first, you're looking around and you don't know
where to start. There's all this plankton flying around,
floating around in the water column,
and they're all there to feed.
It's challenging. It's not easy photography,
but it's worth it.
This immense cloud of zooplankton is made of everything from
larval forms of larger animals, like squid and crabs and rays,
to fully grown creatures, like sea angels.
This is my favourite shot.
Very rare. It's a paper nautilus, also called an argonaut.
You must have been excited.
I was very excited. I chased it to 84 feet
and this is a typical shot it wanted to give me,
which is a butt shot!
I think these animals are deep dwellers,
so they have migrated hundreds of metres.
This migration happens in the entire oceans,
every day, so this is enormous.
This is like the largest migration on Earth.
We know of no greater daily movement
of animal biomass anywhere on the planet.
And as the zooplankton rise,
they cause another huge daily change to the Earth.
They might be small, but Claire has found
they have serious appetites.
Claire's research has shown that some plankton can eat as much
as their own body weight in food in a single day.
And to put that in human terms,
that is the equivalent of me having to eat
this many sandwiches every hour of every day.
Can I at least get a glass of water with this?
This feeding frenzy travels around the world's oceans
as night falls - a Mexican wave of binge eating that never ever stops.
After nine hours, over 3.5 billion tonnes
of zooplankton have completed their daily migration
and they have eaten around 3.4 billion tonnes of phytoplankton.
That's almost eight times the weight of all the people on Earth.
And if life can change so much below the water,
what's going on up above?
Life on land never stands still - not even trees -
and scientists are finding new ways to keep tabs on it
and figure out what it all means to us.
I really love going into forests.
Trees are, in some ways, the basis of life, and they're beautiful.
That one looks good.
Yeah.
Professor Lola Fatoyinbo and David Lagomasino are tackling
a seemingly impossible task.
This one. All right.
Keeping track of all of the trees in the world.
18 metres.
I'll start the scan now.
We scan one tree from one direction. Just like that.
Then, we'll move around a little bit to another spot. Scan two done.
Scan another tree and then we stitch all those images together.
Scan three.
We get a nice 360-degree view of what the forest looks like.
By the time they're done with their lasers
and 360-degree cameras,
they've created a digital copy of the forest accurate enough
to measure every tree and shrub and calculate their growth.
20g per day.
Every single day.
There's a huge range in scales of how fast plants can grow.
There are some bamboos that can grow up to 90 centimetres a day,
where oak trees, on the other hand, will grow
about a millimetre or so a day.
Driving this daily growth is a transformation
that only plants can achieve -
turning sunlight into sugar.
That clever quirk of chemistry called photosynthesis allows plants
to convert that into this.
That simple process of photosynthesis is the only thing
that is keeping us fed down here.
The only reason why we have got energy that we can use.
And if you add all the plants in the world together,
guess how much sugar they make from sunlight?
Daily, photosynthesis produces hundreds of thousands of billions...
SHE LAUGHS
Well, that's a tough one!
Fortunately, David and Lola aren't trying to work it out alone.
They work for Nasa and have access to a fleet of Earth-observing satellites.
So, here, we're starting to see the global picture
of photosynthesis.
Satellites can show us what we can't see,
like photosynthesis in action across the entire world.
Earth-observing satellites are really important,
because we can use them to look at changes in forest cover,
and they give us any idea of what's happening globally
every single day.
A partnership between boots on the ground and eyes in the sky -
that's how scientists like Lola and David are finally able to put
numbers on the colossal changes happening on our green planet -
changes that provide us with food to eat and air to breathe,
from the amount of CO2 plants consume and the oxygen they release,
to the weight of new plant life that every hour brings.
By mid-afternoon, when I'm taking a well-deserved nap after my pile
of sandwiches and cake, scientists with satellites
have worked out that if you took all the new growth in all the forests
and put it in one imaginary plant, you'd get a giant tree
two kilometres high, and in case you're wondering,
the same forests have also made 180 million tonnes of sugar.
Sweet!
But there is a flipside to all of this creation.
Every part of the plant - all the leaves, the branches,
the trunk, the roots - all have this solar energy locked up
inside of them. The problem is, that process is reversible.
All that energy can be released back as heat and light.
This is a film about daily change, and that means destruction,
not just growth.
Because you can't have one thing without the other.
Hello. Hey, mum - I just texted you a picture.
I'm standing right now, right in the middle of the house.
They'd bought this house when it was built new in 1975,
so they've lived here for 42 years.
Um...
The file cabinet is still standing there.
Super nice neighbourhood - it was where I was raised.
But there's going to be very little, if anything.
I'll dig around here, see what I can find, and, er...
All right, love you guys.
In California, they're facing the worst wildfires
in living memory.
Major Baird, this is geo-rectified, right?
Can you show him where the bird is on the map?
This particular fire has grown 14 miles in one day,
which, relative size, is about twice the size of San Francisco County.
It's down all the way into suburban areas,
all the way down into cities and structures.
The fire doesn't care what it burns.
The power went out. My parents are awakened by the neighbour
and the police saying, "You've got to go right now,"
and they left my mum's car, because they couldn't get the door
open easily and in a hurry, and you can see what happened with that.
A freak event for LA, but for the Earth as a whole,
this is business as usual.
Right now, as you watch this, somewhere on Earth,
a wildfire is raging.
It's a natural process,
and we've learned the hard way that trying to stop it
only makes matters worse.
About 100 years ago, we adopted a philosophy
where we were going to put every fire out immediately.
That has led to a cumulative effect where the vegetative matter,
the ecosystem has begun to build up, and it's built up for so long
in so many places, these areas are essentially
tinderboxes, ready for a spark.
THUNDER CRASHES
And with 4 million lightning strikes every day,
there are a lot of ways for the energy harnessed from years
and years of sunlight to be let loose.
Fires are an inevitable consequence of growth -
an unstoppable agent of change.
The problem for us is that we've chosen to live
where fires are most likely.
People in California love the Mediterranean climate,
and it's a wonderful place to live.
The problem is that it's had a fire history
that goes back millennia.
We know that fire's going to happen.
It WILL burn here. It's supposed to burn here.
We're just trying to do our best to contain it.
By the time most of us have completed a full day's work,
wildfires have raged through 5,000 square kilometres of forest,
turning to ash an area the size of the Grand Canyon National Park.
Earthquakes, fires,
landslides and floods all seem
like things we could do with a lot less of,
but actually, there is a theory of evolution
that says that with the right amount of change,
you can create the right conditions for new life to come through.
But you don't want too much disruption,
otherwise life won't have a chance to get started at all.
In an environment where nothing much changes,
there's less diversity of species, but throw in a bit of disaster,
and it mixes things up a bit.
And for the planet as a whole, disasters can clear the way
for new species to emerge -
like the way that mammals could flourish after the loss
of the dinosaurs,
which worked out rather well for us.
Over the course of our day, we've seen how Earth's constant
reinvention makes our world go around, but at night,
something else is revealed.
Our planet isn't a self-contained system with the same old ingredients
getting mixed up over and over.
We're part of a much bigger system where cosmic influences
stir things up a bit.
WHIRRING
And at the end of each day,
the Earth isn't quite what it used to be.
It's quite amazing scene to see - the sky just goes on fire.
I can see a handful of stars, so...
It's kind of strange to see so much power and feel that you're part
of something bigger, part of a huge nature, which is quite amazing.
Astronomer Saevar Helgi Bragason and photographer Oli Haukur Myrdal
are hoping to witness a cosmic light show caused by a storm in space.
And if you want to know the space weather forecast,
these are the people to ask.
So it looks like it erupted yesterday morning,
but I'm not sure...
The weather in space may not seem like our problem, but it can cause
chaos for us earthlings.
When activity is particularly strong,
the kinds of impacts would include
equipment failure, equipment damage. It can also include a blackout.
Bad space weather comes from the sun, which sends a constant
stream of charged particles called the solar wind towards the Earth
at up to 3 million kilometres an hour, and sometimes,
there are more violent outbursts that can fry satellites
and knock out power grids.
This is the sun just 15 minutes ago.
But for Saevar and Oli,
a forecast for bad space weather is exactly
what they've been waiting for...
..so they can witness what happens when the solar wind collides
with our planet.
Now, the solar wind is just a stream of charged particles
and when these particles hit the Earth, they are channelled
by the magnetic field towards the poles,
where they excite the atmosphere.
It's time to get the drone airborne...
..ready for when the solar wind hits our atmosphere to create...
..the aurora borealis...
..or northern lights.
It's amazing. It looks good. It looks really good.
But there's a price to pay for this spectacle.
The latest science is revealing how the lights are actually
a symptom of a huge daily change to Earth.
I hate to break it to you, but our atmosphere is leaking.
When we have the particles that flow from the sun,
they not only excite the atoms in the atmosphere of the Earth,
but they're also causing some of the particles to stream
out into space, like helium.
So when you're looking at, or rather through, an aurora,
you're actually looking at helium ions being lost to space.
In 2010, people were worried that our supply of helium
was running out.
There were even some concerned newspaper reports that a single
party balloon would end up costing as much as £80,
all because our helium was just floating off into space.
And once it's gone, it's gone.
But thankfully, in 2016,
a new deposit of helium was discovered, meaning
that for a while yet, the party can continue.
Since you woke up this morning, about 80 tonnes of atmosphere
have been lost into space...
..including enough helium to fill
800,000 reasonably priced party balloons.
A kilogram every second - that's a pretty drastic weight loss,
but you'll be pleased to know the planet is offsetting some of that.
As we hurtle through the cosmos,
we put a bit of weight back on by picking up a few fellow travellers.
It looks pretty clear out here right now.
Do you think that'll hold for tonight? Sure hope so.
We're looking for a wonderful night under the stars.
Dave Powell is waiting on a special delivery,
shipped express from outer space.
Tonight is the night of the Geminid meteor shower and there's no better
way to see it than in the clear night skies of the desert
with some like-minded friends.
Apparently, they're happening all the time,
but you can only really see them at night.
THEY EXCLAIM
Where was it, Dave?
LAUGHTER
A lot of people think they're really big,
but they're actually only about the size of a common blueberry.
Ooh! Ooh!
Blueberries are the size of meteors.
THEY EXCLAIM Wow! That was a really good one.
Every time I look at blueberries, I'm going to think that now
for the rest of my life.
There are a lot of blueberries out there.
This is what's happening during the meteor shower.
The Earth is moving through space at over 100,000 kilometres per hour
on a collision course with this dust.
The best way I could describe the meteor shower
would be that the sky is raining diamonds.
Whoa!
It's just magical.
A good meteor shower is, like, 60 an hour.
Here, we are over 100 an hour average.
Oh-oh!
I couldn't even count how many we saw tonight.
Whoa!
Every time you switched a direction, you'd see another one.
You'd look left, look right.
There were points where we saw eight, ten in a single minute.
All the blueberries coming on down.
Oh, nice bright one!
They're tiny, but a lot of them come down.
These meteors burn up in the upper atmosphere,
finally falling to our planet as space dust.
There's so much of it, it adds up, making the Earth
a little bit heavier each day.
Whoa!
And if you added up all the space dust and all the meteorites
that hit our Earth, by the end of the day,
you'd have a single meteorite 55 tonnes in weight.
And there's one last change that's probably the biggest change
of all, and you definitely won't have noticed this one.
As we all know, it takes the Earth one year to go around the sun
and return to what we think is our original location,
but that's not quite right.
We're also part of the galaxy, which is spiralling through space
at over 2 million kilometres an hour.
The actual galaxy itself is also in motion.
That means in the course of one day, we have moved
over 50 million kilometres from the day before,
so all of us are never going to return to where we were yesterday.
It makes you realise there's something a lot bigger
than your day-to-day life going on here.
We're all in this together, moving forward through space.
By the time you watch this, we're already somewhere else
and also somewhere else now.
Since we woke up this morning, so much has happened,
but things won't stop just because we head off to bed.
While you're sleeping tonight,
spare a thought for what the planet will be doing.
New land will be created
and tugged into day-altering tides by the moon.
Lakebeds will take flight and fertilise distant continents,
as mountains are broken down into nutrients for the most
abundant form of life on Earth.
Trees will capture enough sunlight
to keep the entire planet fed with sunbeams,
and wildfires will burn acres of forests to allow
new life a chance.
And all the while, we're leaking atmosphere
and careering through the cosmos.
Whoa!
As we recharge our batteries,
the Earth will still be keeping life ticking,
changing enough to keep us alive, but not so much we can't survive.
So, be glad that it's a new world tomorrow, because if it wasn't,
you wouldn't be on it.