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The age and size of the cosmos

are written in light.

The nature of beauty and the substance of the stars,

the laws of space and time...

they were there all along,

but we never saw them...

until we devised a more powerful way of seeing.

The story of this awakening has many beginnings

and no ending.

Its heroes come from many times and places--

an Ancient Chinese philosopher,

a wizard who amazed the caliphs of 11th-century Iraq,

a poor German orphan enslaved to a harsh master.

Each one brought us a little closer

to unlocking the secrets hidden in light.

Most of their names are forever lost to us,

but somewhere, long ago, someone glanced up

to see light perform one of its magic tricks.

Who knows?

Maybe that quirk of light

inspired the very first artist.

Where did all this come from?

How did we evolve from small wandering bands

of hunters and gatherers living beneath the stars

to become the builders of a global civilization?

How did we get from there to here?

There's no one answer.

Climate change, the domestication of fire,

the invention of tools, language, agriculture

all played a role.

Maybe there was something else, too.

In China, more than 2,000 years ago,

a philosopher named Mo Tze is said to have observed

that light could be made to paint a picture

inside a locked treasure room.

This was the description of the first camera...

the camera obscura,

the prototype of all image-forming cameras,

including the one that's bringing you this picture.

Taking advantage of this funny thing that light does

resulted in what could be called the first movie.

Mo Tze, master of light, worked against all forms of darkness.

A military genius

who only used his talents to prevent violence,

he was legendary for traveling

among the kingdoms of the warring states,

employing ingenious strategies

to talk kings out of going to war.

He was one of the first to dream of universal love

and an end to poverty and other forms of inequality;

of government for the people...

and to argue against blind obedience

to ritual and authority.

In his writings, you can find

early stirrings of the scientific approach.

By Mo Tze's time, the Chinese had already been recording

their thoughts in books for at least a thousand years.

Still, our knowledge of him is only fragmentary.

It consists largely of the collection of essays

attributed to him and his disciples.

In one of them, entitled "Against Fate,"

a three-pronged test for every doctrine is proposed.

Question its basis--

ask if it can be verified

by the sights and senses of common people--

ask how it is to be applied

and if it will benefit the greatest number.

Mo Tze was extremely popular,

but a few hundred years after his death,

Qin Shi Huang, the first emperor,

and unifier of China, took power.

He took a continent and turned it into a nation

that now bears his name... China.

Most of us know Emperor Qin for the army of 7,000

terra cotta warriors that guard his tomb.

In Emperor Qin's drive

to consolidate his far-flung empire,

he took drastic measures

to standardize everything within it.

This included mandating a single coinage,

making uniform all weights and measures,

the widths of carts and roads, as well as the precise way

the Chinese language was to be written,

including what you were allowed to write and think.

Emperor Qin's philosophy-- the only one permitted--

was called "legalism,"

which is just what it sounded like,

do as the law says... or else.

It's a philosophy that's not highly conducive

to questioning authority.

...that all the books of the hundred schools of thought

shall be be burned,

that anyone who uses history to criticize the present

shall have his family executed.

The works of MoTze and Confucius

and other philosophers were destroyed

in the world's first book burning.

Hundreds of scholars bravely resisted

by trying to preserve the forbidden books.

They were buried alive in the capitol.

Science needs the light of free expression to flourish.

It depends on the fearless questioning of authority,

the open exchange of ideas.

Sparks of curiosity in the writings of Mo Tze

and his disciples were effectively stomped out.

It would be another thousand years before the next movie.

Luckily, our Ship of the Imagination

can take us anywhere in space... and time.

The ancient Chinese and Greeks observed

that light could be made

to do wonderful things-- but no one asked that question

favored by small children and geniuses alike. Why?

Until a thousand years ago...

In the city of Basra, Iraq,

there lived another master of light.

Ibn al-Hazen had a passionate desire to understand nature.

He questioned everything,

especially those things that everyone else took for granted.

"How do we see?" he asked.

Some of the great authorities who came before him

had taught that rays come out of our eyes and travel

to the objects we see before returning to our eyes.

But al-Hazen reasoned that the stars were too far distant

for something in our eyes to travel all the way to them

and back in the blink of an eye.

Excellent reasoning, but al-Hazen didn't stop there.

He searched for ways to compel nature to divulge her secrets.

His culture was open to new ideas and questioning.

It was the golden age of science

in the Islamic world.

One that stretched from Cordoba in Spain

all the way to Samarkand in Central Asia.

Christian and Jewish scholars were honored guests

at the research institutes of Baghdad, Cairo,

and other Islamic capitols.

Instead of burning books, the caliphs sent emissaries

around the world in search of books.

The caliphs lavishly funded projects to translate, study,

and preserve them for future generations.

Much of the light of Ancient Greek science would have been

permanently extinguished without their efforts.

The reawakening to science that took place in Europe,

hundreds of years later, was kindled by a flame

that had been long tended

by Islamic scholars and scientists.

The Arabs also imported ideas from India to the West,

including the so-called Arabic numerals

that we all use today,

and the concept of zero...

which comes in handy

when you want to write "billions and billions."

Arabic astronomy was so influential,

that we still call most of the bright stars

by their Arabic names.

And the "al's" in algebra, algorithm, alchemy, and alcohol

are just some of the traces left

from the time when Arabic was the language of science.

In the 11th century, Ibn al-Hazen set about trying

to test his ideas about light and how we see.

So we devised an experiment to determine how light moves.

We erected a tent in full daylight

and sealed it tightly so that only a single ray of light

could pierce its inner darkness.

With little more than his brains

and a straight piece of wood-- a ruler--

al-Hazen had accomplished a great leap forward

in the history of science.

He discovered that light moves in straight lines.

But he was just getting started.

Al-Hazen figured out that the key to forming any image--

whether you're talking about an eye or camera obscura--

is a small opening to restrict the light that can enter

an otherwise darkened chamber.

That aperture excludes the chaos

of extraneous light rays that surround us.

The smaller the aperture,

the fewer directions that light can come from.

And that makes the image sharper.

So instead of being blinded by the light,

we can see everything it has to show us.

Al-Hazen made his own camera obscura

and dazzled the caliphs.

A camera obscura works best in bright light.

The stars of the night sky are way too dim for this.

We somehow need a bigger opening to collect light,

but we also need to maintain focus.

A telescope collects light

from any spot in its field of view

across the entire lens or mirror,

an opening much larger than the camera obscura hole.

This is one of the first telescopes...

the one that Galileo looked through in 1609.

With it, he pulled aside the heavy curtain of night

and began to discover the cosmos.

The lens made it possible

for a telescope to have a much larger light-collecting area

than our eyes have.

Big buckets catch more rain than small ones.

Modern telescopes have larger collecting areas,

highly sensitive detectors,

and they track the same object for hours at a time

to accumulate as much of its light as possible.

Space-based telescopes such as the Hubble,

have captured light from the most distant

and ancient galaxies,

giving us vastly clearer pictures of the cosmos.

Al-Hazen discovered how images are formed by light,

but that was far from his greatest achievement.

Ibn al-Hazen was the first person ever

to set down the rules of science.

He created an error-correcting mechanism,

a systematic and relentless way

to sift out misconceptions in our thinking.

Finding truth is difficult...

and the road to it is rough.

As seekers after truth,

you will be wise to withhold judgment and not simply put

your trust in the writings of the ancients.

You must question and critically examine those writings

from every side.

You must submit only to argument and experiment

and not to the sayings of any person.

For every human being is vulnerable

to all kinds of imperfection.

As seekers after truth,

we must also suspect and question

our own ideas as we perform our investigations,

to avoid falling into prejudice or careless thinking.

Take this course, and truth will be revealed to you.

This is the method of science.

So powerful that it's carried our robotic emissaries

to the edge of the solar system and beyond.

It has doubled our lifespan,

made the lost worlds of the past

come alive.

Science has enabled us to predict events

in the distant future...

and to communicate with each other at the speed of light,

as I am with you, right at this moment.

This way of thinking has given us powers

that al-Hazen himself would have regarded as wizardry.

But it was he who put us on this rough, endless road.

And now it has taken us to a place

where even light itself is enshrouded in darkness.

Light has properties unlike anything else

in the realm of human existence.

Take the speed of light.

The basic particle of light, the photon,

is born traveling at the speed of light

as it emerges from an atom or a molecule.

A photon never knows any other speed,

and we've not found another phenomenon that accelerates

from zero to top speed instantaneously.

Nothing else could move as fast.

When we try to accelerate other particles closer and closer

to the speed of light, they resist more and more,

as though they're getting heavier and heavier.

No experiment yet devised

has ever made a particle move as fast as light.

What was that?

You hear something?

Where was I? Oh, yeah.

I don't know anything else in life that behaves like light.

I cannot reconcile its strange properties

with everything else my senses tell me.

Our urge to trust our senses overpowers

what our measuring devices tell us about

the actual nature of reality.

Our senses work fine for life-size objects

moving at mammal speeds,

but are ill-adapted for the wonderland laws of lightspeed.

We don't even know why there's a cosmic speed limit.

Time stands still when you're traveling at the speed of light.

What is light, anyway?

Isaac Newton's enduring fascination with light

began when he was a child...

in this very house.

By the time he was in his 20s, Newton became the first person

to decipher the mystery of the rainbow.

Newton discovered that some light, or white light,

is a mixture of all the colors of the rainbow.

Major discovery.

He named the displays of colors a "spectrum"

from the Latin for "phantom" or "apparition."

Begging your pardon, Master Newton,

the cook frets that your dinner will spoil, sir.

No, Isaac, don't put the magnifying glass down!

Something even more amazing is hidden in the light--

a code, a key to the cosmos.

Isaac Newton didn't miss much, but that one was a beaut.

He just walked right past the door to a hidden universe;

a door that would not swing open again for another 150 years.

It would fall on another scientist,

working in the year 1800,

to stumble on a piece of evidence

for the unseen worlds that surround us.

By night, William Herschel scanned the heavens

with the largest telescope of his time.

By day, Herschel performed experiments.

From Newton's earlier work, it was known that sunlight

is a blend of different colors.

And everyone knew, just from being outside,

that sunlight carries heat.

William Herschel asked

whether some colors of light carry more heat than others.

The nature of scientific genius is to question

what the rest of us take for granted...

and then do the experiment.

The thermometer that Herschel placed outside the spectrum

was his control.

The control in any experiment

always lacks the factor being tested.

That way, you know if what you're testing is

really the thing responsible for the observation.

In Herschel's experiment,

the relationship between

color and temperature was being tested,

and so his control was a thermometer

over the part of the white sheet

that was not illuminated by sunlight at all.

There's that sound again.

What is that?

Okay, red light is warmer than blue light.

Interesting discovery, but not exactly revolutionary.

No, there's nothing wrong with your thermometer.

You've just discovered a new kind of light.

Herschel was the first to detect this unseen presence

lurking just below the red end of the spectrum.

That's why it came to be called "infrared."

"Infra" is Latin for the word "below."

It's invisible.

Our eyes are not sensitive to this kind of light,

but our skin is-- we feel it as heat.

Now, that's a really big discovery.

But far greater secrets were still hiding

deep inside the light.

At about the same time that William Herschel

was discovering infrared light in his parlor in England,

a young boy named Joseph Fraunhofer

was trapped in hopeless drudgery.

He stood over a cauldron of toxic chemicals

and endlessly stirred.

Joseph had been orphaned at the age of 11

and given to a harsh master named Weichselberger,

the royal mirror-maker.

He prevented Joseph from going to school.

Instead, Joseph labored in

the glass-making workshop by day,

and tended to the master's household chores by night.

Hurry up, stupid!

And remember, no reading.

Until Joseph got his big break.

Weichselberger's house collapsed.

Maximilian, the future king of Bavaria,

hurried to the scene of the calamity

to see if he could help.

Maximilian was known for

taking an interest in his subjects,

which was highly unusual for its time.

In attracting the concern of the future king of Bavaria,

young Joseph Fraunhofer

found an aperture into a different universe.

And not just for himself.

Prince Maximilian gave Joseph money

and asked his privy councilor

to provide further help to the boy,

should it be needed.

Weichselberger continued to exploit him

and prevent him from attending school.

But the prince's councilor intervened,

offering Joseph a position at the Optical Institute.

This small gesture of kindness really paid off.

By the time he was 27,

Joseph Fraunhofer was the world's leading designer

of high-quality lenses,

telescopes and other optical instruments.

His firm was housed here, in the old Benediktbeuren Abbey.

In the early 19th century,

this was top-secret, ultra-high technology.

The Benedictine monks of earlier times

had taken a vow of secrecy.

This local tradition,

and the ability to restrict access

to Fraunhofer's laboratory,

allowed him to maintain control

of trade and state secrets.

Fraunhofer was experimenting with prisms

to find the best types of glass for precision lenses.

How, he wondered, could he get a better look

at the spectrum that a prism produced?

Friedrich, bring me the theodolite, please.

Okay, while Fraunhofer sets up his theodolite--

it's a kind of telescope--

I want to show you something in another part of the abbey.

Sound waves are so beautiful to hear.

Imagine how beautiful they'd be to see.

You ever wondered why organ pipes have different lengths?

I press a key...

it sends compressed air

into a particular pipe,

producing sound waves.

If we could slow the sound waves down a few hundred times,

they would look like this.

The length of the pipe

determines the length of the sound wave

that can fit inside it.

A short pipe gives you a short sound wave.

Short sounds waves have high pitch, or frequency.

Let's stop the waves for a better look.

The distance between adjacent waves

is called the wavelength.

A long pipe gives you a long sound wave

with a low pitch, or low frequency.

The medieval manuscript of this music, "Carmina Burana,"

was discovered in this very abbey.

Sound waves can't travel through a vacuum.

They need matter to ride on,

like molecules of air, or water, or rock.

But light waves fly solo.

They can move through empty space.

And fast--

a million times faster than sound waves in air.

And the wavelengths of the light we see

are so much shorter than sound waves.

About 50,000 light waves

would fit right in here.

Oh, yeah.

Fraunhofer.

Just in time.

We didn't miss it.

Just as the wavelength of sound

determines the pitch that we hear,

the wavelength of light

determines the color that we see.

But how does a prism spread out the colors

concealed in a beam of sunlight?

When light travels through air or space,

all its colors move at the same speed.

But when it hits glass at an angle,

the light slows down and changes direction.

Inside the prism,

each color moves at a different speed.

In glass, violet light,

which is carried by the shortest waves we see,

slows down more than red light,

which has the longest waves.

These changes in speed

pry the colors apart,

sending their waves off

in slightly different directions.

That's how a prism works.

If I seem unduly emotional about this,

it's because Joseph Fraunhofer is about to do

what Isaac Newton could've done, but didn't.

And it'll have a powerful effect

on the course of my own life.

You are witnessing the marriage

of physics and astronomy,

the birth of my own field of science,

astrophysics.

Written in the light,

in those vertical black lines...

is secret code.

Fraunhofer looked at them, and wondered...

Why?

A code that comes to us

from an alien universe.

What is the message

written in these dark, vertical lines?

It took a hundred years of thinking,

questioning, searching to decipher it.

Lovely, isn't it?

Why?

There are many layers to the fine structure of beauty...

the chemistry of the Earth and its atmosphere...

the evolution of life...

Many distinct threads.

Let's just examine one, at the surface...

the colors of nature that dazzle us.

What's really happening?

How does the red, the blue...

the astonishing palette of nature's colors...

how do they happen?

Light waves of different lengths from the Sun

strike the Earth.

The petals of these particular flowers

absorb all the low-energy,

long red wavelengths of light.

But the petals reflect

the shorter, high-energy blue wavelengths.

That interaction between starlight and petal--

or water, or Van Gogh--

is what makes blue.

The longest waves,

the ones we see as red,

have the lowest energy.

Color is the way our eyes perceive

how energetic light waves are.

A sunset...

a flag...

the eyes of your beloved...

that shiny new car.

The feelings they inspire

happen when something inside you

is triggered by a particular variation

in the frequency and energy of light waves.

And the secret message?

Those black vertical lines

in Fraunhofer's spectrum?

What makes them?

They occur when the light waves

of those particular colors are being absorbed.

It happens on another level of reality,

far smaller than the world we're used to operating in.

To get there, we'll need to become

ten billion times smaller than we are.

We could pick any one of these atoms.

But let's go for the hydrogen atom.

The hydrogen atom is the most plentiful kind

of atom in the cosmos.

And the simplest.

It has only one electron.

And only one proton.

We've entered the quantum realm.

It doesn't correspond

to ordinary human experience.

Common sense is no help here at all.

Take the hydrogen atom's electron, for example.

In an atom, an electron

doesn't exist between orbitals.

It disappears from one orbital

and reappears in another.

It's as if you took an elevator from the second floor

to the fourth floor, but ceased to exist in between.

And another thing.

Quantum elevators only stop at certain floors.

The sizes of the electron orbits are strictly limited,

and different for the atoms of every element.

That's why the elements are different.

The chemistry of anything is determined

by its electron orbits.

The force that holds an electron in orbit

has nothing to do with gravity.

It's a force of electrical attraction.

The electron dances a wavy ring

around the central nucleus of a hydrogen atom.

And makes quantum leaps from orbit to orbit.

Up or down.

The larger the orbit,

the greater the energy of an electron.

An electron has

to get energy to leap to a larger orbit.

And it has to lose energy to jump back down.

Every upward leap is caused by...

an atom absorbing a light wave.

But we have no idea what causes the downward leaps.

What we do know that such leaps always produce a light wave

whose color matches the energy difference

between the orbitals.

The Sun's surface radiates light waves of all colors.

If you look at sunlight through a prism,

you'll see its spectrum.

When you magnify the spectrum with a telescope,

as Joseph Fraunhofer did,

you raise the curtain

on the electron dance within the atom.

When the energy of the electron flags,

and it drops to a lower orbital,

the light wave it emits scatters.

Most of it doesn't reach us.

That leaves a dark gap

or black vertical line in the spectrum.

These dark lines are the shadows

cast by hydrogen atoms

in the atmosphere of the Sun.

Sodium atoms cast different shadows.

Their electrons dance to a different tune.

A grain of table salt is composed

of sodium and chlorine atoms.

Ten million billion of them

doing their crazy dances

in a single grain of salt.

And a single iron atom with 26 electrons

is like a great big production number

in a Broadway musical.

When you look at a star with a spectroscope,

you see the dark lines from all the elements

in its atmosphere.

Show me the spectrum of anything,

whether here on Earth or from a distant star,

and I'll tell you what it's made of.

Fraunhofer's lines are the atomic signatures

of the elements writ large across the cosmos.

As with every other major revelation

in the history of science, it opened the way

to newer and deeper mysteries.

And to the revelation that there were

many more secrets hiding in the light.

When Joseph Fraunhofer combined a prism with a telescope

and turned it toward the skies,

he brought the stars much closer to us.

When he was only 39,

he contracted a fatal illness.

Perhaps as a result of his early and long-term exposure

to the toxic chemicals of glassmaking.

You never know where the next genius will come from.

How many of them do we leave in the rubble?

The prince and his kingdom were immeasurably enriched

by that act of kindness to a poor orphan.

Fraunhofer's discoveries transformed Bavaria

from a rural backwater to a technological powerhouse.

As he lay dying, the government was desperate

to preserve every shred of his precious knowledge

about the high technology of optical glass.

But it could only be divulged to a person

with top security clearance--

the director of the mint.

The government kept Fraunhofer's technology

for making perfect optical glass

a State secret for another hundred years.

This would prove to be a major obstacle

for someone we'll meet later in our journey.

But Fraunhofer would allow no such secrecy

where his pure scientific research was concerned.

He knew that science requires openness to flourish;

that our understanding of nature belongs to the world.

As soon as Fraunhofer discovered the spectral lines,

he published everything he knew about them.

And the reverberations of his momentous discovery

echo still.

His spectral lines revealed that the visible cosmos

is all made of the same elements.

The planets...

The stars...

The galaxies...

We, ourselves, and all of life...

The same star stuff.

He made it possible for us to know

what's in the atmosphere of other worlds.

And in galaxies millions of light-years away.

Spectral lines revealed not only the composition

of far-off objects, but also their motion

towards or away from us.

Using them, we discovered that our universe is expanding.

But perhaps the greatest revelation of spectroscopy

is the discovery of the thing it cannot see.

A hidden universe of dark matter

six times more massive than the familiar cosmos.

It's made of some mysterious substance

that does not emit, reflect or absorb any kind of light.

We only know it's there because of its gravity,

which pulls on all the galaxies

and speeds up the visible stars within them.

There are many more kinds of light than our eyes can see.

Confining our perception of nature to visible light

is like listening to music

in only one octave.

There are so many more.

They differ only in wavelength,

but over a huge range.

For instance, infrared light...

the kind that William Herschel discovered

Or X-ray light.

Or radio light.

Or in gamma-ray light.

These are not just different ways of seeing the same thing.

These other kinds of light

reveal different objects and phenomena in the cosmos.

In gamma-ray light, for example, we can see mysterious explosions

in distant galaxies

that we would otherwise miss.

And in microwave light, we can see all the way back

to the birth of the universe.

We have only just opened our eyes.

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