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In 1973, nine astronauts
were sent to live and
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work in the world's first
space station, SkyLab.
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Their mission was to observe
the Sun, free from the Earth's
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distorting atmosphere.
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The astronauts witnessed what
no human beings had ever
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seen before: a sun more
powerful than anyone
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could have imagined.
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To our ancestors, the sky was
an unfathomable mystery.
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At night, it was brimming with
pinpoints of light: stars.
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Then there was the Sun.
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Its arrival in the morning
caused those stars to vanish,
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and miraculously brought warmth and light.
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It was seen as the giver
of life, the first god.
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This is the story of mankind's
struggle to see behind
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the glare, and glimpse
the truth about the Sun,
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how we came to understand
the scope of its power,
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and its role in the Universe.
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In February, 1998, the
Caribbean island of Guadelupe
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prepared for a rare celestial event.
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For a few brief minutes, day
would become night during a
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total eclipse of the Sun.
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This was Francisco Diego's tenth eclipse.
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As a young boy in Mexico, he
was deeply affected by the
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first one he saw.
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It started a lifelong
fascination with the Sun.
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The Sun was perceived as
the immaculate, gold disc,
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perfect, it was perfection,
it was a religious belief,
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because everything was perfect
in the sky, and the Sun was
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the most perfect circle in
the sky, with no blemishes,
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no structure, just a perfect,
flat disc, golden disc.
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And it was the Sun god
for many, many religions
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in the world.
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The Sun remained a symbol
of perfection until
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a 17th century Florentine
called Galileo first pointed a
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telescope at the sky and
found that that idea might
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just be wrong.
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What Galileo did was apply
the telescope for the first
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time, and discover that
the Sun was not perfect.
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That the Sun have sunspots, and
that was a major revolution
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in philosophy and of course, in science.
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Over several weeks, Galileo watched the
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sunspots move across the surface
of the Sun, and realized
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that it was spinning.
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Galileo's discovery completely
changed ideas about the Sun.
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But although he spent the
rest of his life studying it,
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he never saw anything more.
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The blinding light of the
Sun made further scientific
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observation very difficult.
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But there were moments, provided
the scientists chose them
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carefully, when it was possible to cheat
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the Sun's dazzling rays.
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Roughly three times every
decade, somewhere in the world,
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the Moon passes directly
in front of the Sun.
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It offers a rare and special opportunity.
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If the Sun was this big, the
Earth would be a little ball
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of about three or four millimeters
in diameter, and the Moon
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is even smaller than that.
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The Moon is only a quarter
of the size of the Earth,
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so the Moon is four hundred
times smaller than the Sun.
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But the fantastic coincidence
is that the Sun is 400 times
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farther away than the Moon from us.
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So we see both of them, by
coincidence, more or less
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the same size.
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One minute!
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For four hours, Francisco watched the Moon
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creep into position.
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No theatres!
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He'd come halfway around the world to watch
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just four minutes of total eclipse.
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But even if you are in the
right place at the right time,
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there's never any guarantee of success.
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In the end, Francisco got
just a few moments to glimpse
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the hidden Sun.
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We lost it.
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No corona.
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Then, to his huge disappointment,
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he was thwarted as the clouds rolled in
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to wreck his eclipse.
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Douglas Gough is a leading solar scientist.
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To see his first total eclipse,
he traveled to Indonesia.
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The Indonesian government had
declared it to be illegal
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to watch the eclipse, at
least for the Indonesians.
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They had either to watch it on television,
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or to go to the mosque and
pray for the dragon to spit
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the Sun out again.
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Which is what they
believed was taking place.
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I was standing at the end
of a road on my own,
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and a little boy came up
to me, had be watching me.
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About three years old.
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And I gave him some dark film,
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to look at the Sun through,
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and then an old man of about
70, who turned out to be
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the head of the village, came
too, and the three of us
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saw this fantastic eclipse.
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A total eclipse reveals the Sun's corona,
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an outer layer normally lost in the glare.
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A very eerie feeling, and
almost total silence;
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the birds stopped singing.
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And the only thing we could
hear in the distance was the
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chanting from the mosques.
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This is what early astronomers traveled
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the world to see.
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Within the corona were what
looked like burning clouds.
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It seemed that the surface of
the Sun was smothered in a
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turbulent, raging atmosphere.
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Well, you realize, when
you see these things
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moving, that the Sun is active.
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It's not just a quiet, passive
ball of gas, but it's
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churning away; interesting
things are happening.
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Seeing anything for the
first time is exciting.
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That's why explorers on Earth
would explore parts of the
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Earth where no man had been before.
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There's very little left of
the Earth now to do that,
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so we go elsewhere in the Universe.
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Seeing the Sun, peeling
off a layer of mist,
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a lack of understanding, and
suddenly seeing how something
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works is an amazing
experience when you see this
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for the first time.
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For more than 200 years,
scientists had only
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fleeting chances to study these
unique views of the Sun.
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Then, in the middle of the
19th century, father Angelo
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Secchi, the Vatican's chief
astronomer, found himself
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at the forefront of a revolution
in how we looked at light.
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Through an observatory
above his church in Rome,
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he pioneered the use of a new
branch of science called
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spectroscopy.
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Secchi's spectroscope split
sunlight into its different
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colors, then magnified the
light from just one region.
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What the discovered at the edge
of the Sun was a revelation.
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Spectroscopy revealed a
complexity that would have
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astonished Galileo.
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What had happened is that
you were no longer dazzled
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by most of the light from the Sun;
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you could see something else.
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You could see the kinds of
things that you can see at the
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edge of the Sun during an
eclipse when you're no longer
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dazzled by the light from the Sun.
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Astronomers could now study not just the
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edges, but the body of the Sun.
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Galileo's sunspots were
revealed as Earth-sized tears
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in the surface, like windows
on a mysterious interior.
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The surface itself bubbled
before their eyes.
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Soon, they were able to identify
the chemicals that made up
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the Sun.
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Dark bands in its spectrum
revealed the presence
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of hydrogen, calcium, iron,
and astronomers discovered
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an alien element, completely
unknown on Earth.
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They named it after Helios,
the Greek Sun god: Helium.
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In 1862, Father Secchi turned
his spectroscope to the night
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sky to see what stars were made of.
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He recognized the pattern
of chemicals immediately.
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They were all but identical to the Sun.
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One of the great mysteries of
the heavens had been resolved.
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Our Sun was a star.
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The religious implications
of Secchi's discovery were
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profound, but what troubled
the church was a huge step
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forward for astronomers.
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The Sun was one of those stars,
and so now, for the first
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time, one realized that the Sun
was a member of the family
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of stars, but from a scientific
point of view, that's
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fantastic, because we want to
know what most of the Universe
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is like, and so, by studying
the Sun, we can study
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a typical star.
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By the late 1940s, rockets
were going beyond
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the Earth's atmosphere.
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Scientists discovered that
the fringes of space were
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scorched with radiation.
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It seemed that while our
atmosphere allowed heat and light
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to pass through, it was
shielding us from x-rays, gamma
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rays, and ultraviolet light
that had to be coming
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from the Sun.
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Alexei Leonov was the first
man to brave this dangerous
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radiation and come face
to face with a star.
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Then, in 1973, the first
solar space laboratory was
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launched, but the project
almost ended in disaster.
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When SkyLab was launched, it
had a heat shield wrapped
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around it that was to open
up after it got into orbit,
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and what happened was 60
seconds into the flight,
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that heat shield popped open,
and of course, it's still
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in the air stream, and so the
air stream tore the heat
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shield off, and when it did that,
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it unlocked both solar wings.
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Commander Pete Conrad had already walked
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on the Moon when he was
chosen to lead the first crew
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on SkyLab.
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But their new home was no longer
protected by an atmosphere,
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and inside, temperatures started to soar.
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Their first job was to
find some way of shielding
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the damaged station from the
worst of the Sun's rays.
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Right away, on day one, we
went in and got this temporary
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heat shield rigged, which we
were able to rig from inside.
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We were able to put it out
through one of the air locks.
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We were able to push, just
like an umbrella, a pole
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and mylar sheets that then
popped open like an umbrella,
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and then we were able to pull
it back into where it was
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just offset by just a few
inches off the side, and it did
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take care of the heating problem.
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Temperature began to go down immediately.
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As the temperatures finally dropped
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to safe levels, the crew made their way
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into the observatory.
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Their next task was to get
to grips with life in a
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weightless environment.
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Initially, nausea prevented
all but the toughest from
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eating, but the problem soon
passed, and within a few days,
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space didn't seem such
a bad place after all.
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And then, with no distorting
atmosphere to blur their
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sights, the most comprehensive
solar observation
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in history began.
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The SkyLab flight is very
near and dear to my heart.
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I know a lot of people don't
understand that it probably
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means more to me than going
to the Moon, and of course,
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00:16:59,917 --> 00:17:04,084
part of that was being able
to run the solar telescope
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and know that we were bringing
back a tremendous amount
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of information that nobody ever had before
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in any great quantities.
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And to begin with, when I
switch to the new position
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00:17:17,483 --> 00:17:21,650
called H-Album, these words
stand for hydrogen album,
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and they are called hydrogen
because the light that we see
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comes from light radiated by hydrogen atoms
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in the Sun's atmosphere.
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Viewing the Sun with the same wavelengths
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of light used by Secchi more
than 100 years earlier,
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the SkyLab astronauts
saw incredible details
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on the Sun's surface.
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00:17:43,365 --> 00:17:47,277
For example we can see
sunspots, we can see network,
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we can see filaments, all
these things on the Sun,
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in great detail.
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Each one of us took a
four-hour turn at the solar
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telescope panel.
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00:17:58,783 --> 00:18:03,055
Now, I've always related that
to playing three 88-keyboard
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pianos at the same time.
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00:18:05,622 --> 00:18:09,789
It was a very complicated set
of switching and everything.
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00:18:12,483 --> 00:18:15,849
It was very involved and
very intense, and you'd work
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real hard during that time
frame, making sure those
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sequences ran the right way.
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00:18:21,574 --> 00:18:24,011
And then things would come up
in real time, like a solar
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flare all of a sudden.
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So we had to be prepared
to catch that, also.
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Solar flares are planet-sized eruptions
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of boiling gas that somehow
break free of the Sun.
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They had been seen from
Earth, but never in such
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extraordinary detail.
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If somebody else was running
it, they might call us,
245
00:18:48,008 --> 00:18:50,840
and we could go up and take a look also.
246
00:18:50,841 --> 00:18:53,521
So that happened quite frequently,
when something really
247
00:18:53,522 --> 00:18:57,689
unusual came up that we could
witness, we would call
248
00:18:58,754 --> 00:19:02,504
the other guys up, let
them come take a peek.
249
00:19:06,751 --> 00:19:09,571
In nine months, successive SkyLab crews
250
00:19:09,572 --> 00:19:13,739
took more than 160,000 images,
revealing aspects of the Sun
251
00:19:14,832 --> 00:19:17,582
that had never been known before.
252
00:19:19,267 --> 00:19:22,447
The most spectacular discoveries
were the coronal mass
253
00:19:22,448 --> 00:19:25,825
ejections, outbursts of material on a scale
254
00:19:25,826 --> 00:19:27,993
that dwarfed solar flares.
255
00:19:29,936 --> 00:19:34,035
These were the best views
yet of the turbulent Sun.
256
00:19:59,646 --> 00:20:02,966
But why were the coronal
mass ejections so much more
257
00:20:02,967 --> 00:20:05,752
powerful than the solar flares?
258
00:20:05,753 --> 00:20:08,753
The key lay with Galileo's sunspots.
259
00:20:26,326 --> 00:20:29,332
Before the dawn of the space
age, the summit of the
260
00:20:29,333 --> 00:20:32,676
San Gabriel mountains was
as close as it was possible
261
00:20:32,677 --> 00:20:35,344
for an American to get to space.
262
00:20:38,760 --> 00:20:43,484
In 1903, George Ellery Hale,
the son of a wealthy engineer,
263
00:20:43,485 --> 00:20:44,485
had a dream.
264
00:20:45,633 --> 00:20:48,802
He would indulge his passion
for astronomy by building
265
00:20:48,803 --> 00:20:52,331
the world's most advanced
solar observatory high above
266
00:20:52,332 --> 00:20:54,082
the town of Pasadena.
267
00:21:00,343 --> 00:21:03,059
Sallie Baliunas is an astrophysicist
268
00:21:03,060 --> 00:21:05,903
at the Mount Wilson Observatory.
269
00:21:05,904 --> 00:21:08,040
Hale is my personal hero.
270
00:21:08,041 --> 00:21:11,453
He was not only a great
scientist, he had instinct
271
00:21:11,454 --> 00:21:14,727
about engineering, so he could
build the largest telescopes
272
00:21:14,728 --> 00:21:19,080
in the world so successfully,
he raised a lot of money
273
00:21:19,081 --> 00:21:21,844
to do these projects, something
scientists always have to
274
00:21:21,845 --> 00:21:26,012
do, and as he often said
himself, he made no small plans.
275
00:21:30,436 --> 00:21:33,235
The route to the top of Mt.
Wilson wasn't easy.
276
00:21:36,531 --> 00:21:39,932
This road wasn't built
until 1936, so all the
277
00:21:39,933 --> 00:21:44,100
tons of concrete and steel had
to be brought up by backpack,
278
00:21:44,948 --> 00:21:48,070
or by mule train, on a very
steep seven mile trail
279
00:21:48,071 --> 00:21:51,043
up the side of the mountain.
280
00:21:51,044 --> 00:21:53,678
The pack horses had to make over 60 trips
281
00:21:53,679 --> 00:21:56,279
to transport the telescope alone.
282
00:21:56,280 --> 00:21:58,810
But Hale soon had an
observatory that was the envy
283
00:21:58,811 --> 00:21:59,894
of the world.
284
00:22:06,949 --> 00:22:10,234
Hale's first challenge was to
understand the Sun's oldest
285
00:22:10,235 --> 00:22:12,235
known feature: sunspots.
286
00:22:14,925 --> 00:22:19,099
Hale built a spectrograph,
which is beneath this table.
287
00:22:19,100 --> 00:22:22,722
75 feet below is a grating
that disperses the light
288
00:22:22,723 --> 00:22:26,576
of the Sun into its energy components.
289
00:22:26,577 --> 00:22:29,327
The grating would look like this.
290
00:22:30,896 --> 00:22:35,063
And would break up the sunlight
into its different colors,
291
00:22:36,318 --> 00:22:40,299
and buried in this spectrum
are the absorption lines
292
00:22:40,300 --> 00:22:42,300
of the gases of the Sun.
293
00:22:43,296 --> 00:22:46,917
With his unique spectrograph,
Hale set about,
294
00:22:46,918 --> 00:22:49,668
analyzing the surface of the Sun.
295
00:22:57,309 --> 00:23:01,000
He was able to take photographs
of sunspots, in more detail
296
00:23:01,001 --> 00:23:04,084
than anyone had ever achieved before.
297
00:23:05,146 --> 00:23:08,314
But it was during a study of
the chemical absorption lines
298
00:23:08,315 --> 00:23:12,482
of the Sun's surface that Hale
made a profound discovery.
299
00:23:14,236 --> 00:23:17,751
When he looked at the
quieter part of the Sun,
300
00:23:17,752 --> 00:23:21,374
he saw ordinary looking
absorption lines, and then,
301
00:23:21,375 --> 00:23:24,613
as the sunspot rolled into
the slit, the lines began
302
00:23:24,614 --> 00:23:27,900
to broaden a little bit, and then split.
303
00:23:27,901 --> 00:23:30,454
As Hale saw the lines split apart,
304
00:23:30,455 --> 00:23:33,078
he instantly recognized the phenomenon.
305
00:23:33,079 --> 00:23:33,912
Voila.
306
00:23:33,912 --> 00:23:34,863
Magnetic fields.
307
00:23:34,864 --> 00:23:35,942
He could see it.
308
00:23:35,943 --> 00:23:36,943
June, 1908.
309
00:23:39,716 --> 00:23:42,025
In that instant, Hale had unraveled
310
00:23:42,026 --> 00:23:45,334
one of the Sun's greatest mysteries.
311
00:23:45,335 --> 00:23:49,002
Sunspots were caused by
magnetic distortion.
312
00:23:51,082 --> 00:23:54,576
These distortions are some
4,000 times greater than the
313
00:23:54,577 --> 00:23:56,494
Earth's magnetic field.
314
00:23:57,619 --> 00:24:00,996
They hold back the gases
rising up, cooling the surface
315
00:24:00,997 --> 00:24:04,747
by 2,000 degrees, and
causing the dark spots.
316
00:24:06,953 --> 00:24:08,601
So a sunspot, on the surface,
317
00:24:08,602 --> 00:24:12,095
is nothing more than a twisted
and kinked magnetic field,
318
00:24:12,096 --> 00:24:14,263
looped out of the surface.
319
00:24:16,949 --> 00:24:19,259
This magnetogram shows how the surface
320
00:24:19,260 --> 00:24:22,742
of the Sun is speckled with
positive and negative lines
321
00:24:22,743 --> 00:24:24,243
of magnetic force.
322
00:24:29,291 --> 00:24:32,755
These field lines channel the Sun's storms;
323
00:24:32,756 --> 00:24:36,465
eruptions of plasma, which
explode outwards for thousands
324
00:24:36,466 --> 00:24:39,344
of kilometers, before being dragged back
325
00:24:39,345 --> 00:24:41,428
into its boiling surface.
326
00:24:44,929 --> 00:24:48,283
Coronal mass ejections and prominences,
327
00:24:48,284 --> 00:24:50,246
everything we see on the
surface of the Sun,
328
00:24:50,247 --> 00:24:54,043
all the dynamical features,
are all magnetic in nature.
329
00:25:09,078 --> 00:25:11,794
In one of the coldest places on Earth,
330
00:25:11,795 --> 00:25:15,579
some 15 years before Hale
started his investigation
331
00:25:15,580 --> 00:25:19,723
into the sun, a scientist
in Norway had drawn his own
332
00:25:19,724 --> 00:25:23,891
extraordinary conclusions
about the Sun's magnetism.
333
00:25:26,307 --> 00:25:29,557
In a land where scientists
cannot see the Sun for months
334
00:25:29,558 --> 00:25:33,133
on end, he was convinced that
you could still feel its
335
00:25:33,134 --> 00:25:36,616
presence in one of the most
beautiful natural phenomena
336
00:25:36,617 --> 00:25:37,617
on Earth.
337
00:25:40,471 --> 00:25:44,011
It may be strange to see why
we are out here, far to
338
00:25:44,012 --> 00:25:48,737
the North, on top of a snowy
roof, in the darkness,
339
00:25:48,738 --> 00:25:50,675
when you're dealing with the Sun.
340
00:25:50,676 --> 00:25:54,843
But here, you see the Aurora,
the Northern Lights.
341
00:25:55,959 --> 00:25:59,081
I really like to see the
Aurora of a dark sky.
342
00:25:59,082 --> 00:26:02,669
It's a beautiful sight,
and many strange colors,
343
00:26:02,670 --> 00:26:05,792
which you do not see in any other place.
344
00:26:05,793 --> 00:26:10,169
It really lights up this
dark days that we have here
345
00:26:10,170 --> 00:26:12,142
in the North, in Wintertime.
346
00:26:12,143 --> 00:26:15,358
Earlier, it was often thought
the Northern Lights were
347
00:26:15,359 --> 00:26:18,359
the souls of dead soldiers fighting.
348
00:26:33,980 --> 00:26:36,696
Norway is one of the
best places in the world
349
00:26:36,697 --> 00:26:38,114
to study Auroras.
350
00:26:40,319 --> 00:26:43,395
Truls Hansen monitors the
radioactivity high in the
351
00:26:43,396 --> 00:26:44,979
Earth's atmosphere.
352
00:26:46,774 --> 00:26:50,941
It's an area of research that
goes back over a century.
353
00:26:51,778 --> 00:26:56,375
100 years ago, Norway's most
famous scientist dedicated
354
00:26:56,376 --> 00:27:00,008
his life to the study of
these strange atmospheric
355
00:27:00,009 --> 00:27:04,176
disturbances; his name was Dr.
Kristian Birkeland.
356
00:27:05,954 --> 00:27:08,182
Birkeland was certainly
brilliant, but all the little
357
00:27:08,183 --> 00:27:12,350
bit mad, and you might see that
from his book here, really.
358
00:27:13,674 --> 00:27:15,923
This book you will find
not only the theories
359
00:27:15,924 --> 00:27:20,404
about particles and Aurora,
but you will find a lot
360
00:27:20,405 --> 00:27:24,572
of ideas; some of them were
right, most of them are wrong.
361
00:27:25,676 --> 00:27:29,320
And one of them was in his
terella, which we see clearly
362
00:27:29,321 --> 00:27:33,488
here, was a vacuum chamber
with a small globe pretending
363
00:27:34,708 --> 00:27:37,122
the Earth inside it.
364
00:27:37,123 --> 00:27:39,967
And we can also see Birkeland
himself on the side here,
365
00:27:39,968 --> 00:27:42,486
controlling the experiment.
366
00:27:42,487 --> 00:27:44,901
Birkeland's most celebrated experiment
367
00:27:44,902 --> 00:27:48,558
artificially created the
Northern Lights, and to protect
368
00:27:48,559 --> 00:27:52,726
his brain from radiation,
bizarrely, he always wore a fez.
369
00:27:58,706 --> 00:28:01,817
Odd as he may have appeared,
Birkeland's theories about the
370
00:28:01,818 --> 00:28:05,985
origin of Auroras stemmed from
years of dedicated study.
371
00:28:13,149 --> 00:28:16,550
The Northern Lights were known
to be particularly energetic
372
00:28:16,551 --> 00:28:19,634
following a period of solar activity.
373
00:28:20,707 --> 00:28:23,179
Birkeland wanted to try
and find a mechanism
374
00:28:23,180 --> 00:28:24,847
that linked the two.
375
00:28:25,978 --> 00:28:30,006
These are the old magnetometers,
which we are operate...
376
00:28:30,007 --> 00:28:32,955
Have been operating here for
more than hundred years,
377
00:28:32,956 --> 00:28:35,671
and are still used some
places around the world.
378
00:28:35,672 --> 00:28:39,672
And Birkeland, he used
very similar instruments.
379
00:28:42,545 --> 00:28:45,145
We have here a recording of
the magnetic field during
380
00:28:45,146 --> 00:28:47,978
one day, taken with this instrument.
381
00:28:47,979 --> 00:28:52,146
It starts rather quiet
around noon, and then here,
382
00:28:54,179 --> 00:28:57,394
in the evening, we get a
sort of attack, and we get
383
00:28:57,395 --> 00:29:00,726
a magnetic storm, which you
see very clearly here,
384
00:29:00,727 --> 00:29:04,661
and during this period, we
also have a large Aurora,
385
00:29:04,662 --> 00:29:06,245
very bright Aurora.
386
00:29:16,760 --> 00:29:19,058
What we see here is the
so-called Birkeland terella
387
00:29:19,059 --> 00:29:22,193
experiment, he built several
of this kind, but this is the
388
00:29:22,194 --> 00:29:26,361
biggest one, and the last one I
suppose, being made in 1913.
389
00:29:29,078 --> 00:29:31,666
It's really a large vacuum chamber,
390
00:29:31,667 --> 00:29:34,417
with a model of the Earth inside.
391
00:29:35,615 --> 00:29:38,412
Birkeland's hunch was
that the magnetic storms
392
00:29:38,413 --> 00:29:41,133
which accompanied the
Northern Lights were caused
393
00:29:41,134 --> 00:29:44,697
by a stream of electrically
charged particles buffeting
394
00:29:44,698 --> 00:29:46,948
the Earth's magnetic field.
395
00:29:48,100 --> 00:29:50,525
He believed that these
particles had to be coming
396
00:29:50,526 --> 00:29:51,609
from the Sun.
397
00:29:53,115 --> 00:29:57,198
But other scientists never
followed up his ideas.
398
00:29:58,409 --> 00:30:01,492
In 1917, Birkeland committed suicide.
399
00:30:05,654 --> 00:30:09,902
In fact, evidence for the
extraordinary power of the Sun
400
00:30:09,903 --> 00:30:13,652
had been visible to humans
for thousands of years.
401
00:30:13,653 --> 00:30:16,938
Chinese astronomers noted
that the tails of comets
402
00:30:16,939 --> 00:30:20,850
always pointed directly away from sunlight.
403
00:30:20,851 --> 00:30:23,846
It was assumed that the trail
of dust was being pushed
404
00:30:23,847 --> 00:30:27,097
away by the gentle pressure of the Sun.
405
00:30:31,138 --> 00:30:35,920
But in 1947, a German
physicist, Ludwig Biermann,
406
00:30:35,921 --> 00:30:39,867
calculated that something far
more substantial than sunlight
407
00:30:39,868 --> 00:30:43,035
had to be pushing the tails of comets.
408
00:30:45,464 --> 00:30:49,666
He called it "solar corpuscular
radiation," but his idea
409
00:30:49,667 --> 00:30:52,500
was widely rejected by scientists.
410
00:30:53,615 --> 00:30:57,178
Despite the general derision,
a physicist from Chicago
411
00:30:57,179 --> 00:31:00,138
called Eugene Parker believed
there might be something
412
00:31:00,139 --> 00:31:02,056
in Biermann's argument.
413
00:31:03,181 --> 00:31:05,200
I had a particularly good
chance to talk with him
414
00:31:05,201 --> 00:31:07,476
when he was visiting Chicago.
415
00:31:07,477 --> 00:31:09,601
He pointed out that if
it isn't the sunlight,
416
00:31:09,602 --> 00:31:11,992
there is only one other
possibility, and that is the
417
00:31:11,993 --> 00:31:14,721
solar corpuscular radiation,
the emission of particles
418
00:31:14,722 --> 00:31:17,077
from the Sun, that interacts
with the tail and blows
419
00:31:17,078 --> 00:31:19,248
it away from the Sun.
420
00:31:19,249 --> 00:31:22,372
His revelations about the
comet tails really got to me,
421
00:31:22,373 --> 00:31:25,873
and I realized he had a fundamental point.
422
00:31:35,357 --> 00:31:37,747
The eminent physicist Sydney Chapman
423
00:31:37,748 --> 00:31:41,248
was particularly eager to attack Biermann.
424
00:31:42,265 --> 00:31:46,966
He pointed out that the volume
of the Sun was 330,000 times
425
00:31:46,967 --> 00:31:50,774
greater than the earth, and that
no particle, however small,
426
00:31:50,775 --> 00:31:54,525
could escape its enormous
gravitational pull.
427
00:31:57,288 --> 00:32:00,805
Dismissing Biermann's ideas
about solar wind, Chapman
428
00:32:00,806 --> 00:32:04,183
was interested in researching
a quite different area:
429
00:32:04,184 --> 00:32:07,351
examining how the Sun's corona worked.
430
00:32:10,105 --> 00:32:13,425
He suggested that the corona,
though still firmly bound
431
00:32:13,426 --> 00:32:16,838
to the Sun, stretched much
further than could be seen
432
00:32:16,839 --> 00:32:18,922
during the solar eclipse.
433
00:32:21,239 --> 00:32:24,373
Eugene Parker met Sydney
Chapman at an observatory
434
00:32:24,374 --> 00:32:26,124
in Boulder, Colorado.
435
00:32:27,996 --> 00:32:30,712
Coming home from Boulder, I
was thinking about what I
436
00:32:30,713 --> 00:32:34,009
had learned from Chapman:
this very basic idea that the
437
00:32:34,010 --> 00:32:37,202
corona extends out through
the Solar System, filling
438
00:32:37,203 --> 00:32:41,033
everything, and then I realized
that Chapman and Biermann
439
00:32:41,034 --> 00:32:44,760
were mutually exclusive, that
is, the solar corpuscular
440
00:32:44,761 --> 00:32:48,034
radiation that seems to
effect the comet tails cannot
441
00:32:48,035 --> 00:32:50,461
penetrate through a static corona.
442
00:32:50,462 --> 00:32:53,119
You get interactions that block this.
443
00:32:53,120 --> 00:32:56,939
And, on the other hand, I
could not see that either one
444
00:32:56,940 --> 00:32:58,440
of them was wrong.
445
00:33:00,957 --> 00:33:03,394
Parker worked at the apparent contradiction
446
00:33:03,395 --> 00:33:07,562
in the two theories, and found
that they were both right.
447
00:33:09,131 --> 00:33:12,357
I wrote down the equations of
motion and integrated them
448
00:33:12,358 --> 00:33:15,840
and found there was one and
only one solution that fitted
449
00:33:15,841 --> 00:33:18,522
the condition of strongly
bound at the Sun and zero
450
00:33:18,523 --> 00:33:22,005
pressure in infinity, and that
was the solution providing
451
00:33:22,006 --> 00:33:24,173
the supersonic solar wind.
452
00:33:55,129 --> 00:33:58,193
Immediately declared that
it was false and published
453
00:33:58,194 --> 00:34:02,884
papers purportedly showing
alternatives, and gave lectures
454
00:34:02,885 --> 00:34:07,725
decrying the idea, and a lot of
my friends were sympathetic,
455
00:34:07,726 --> 00:34:09,826
they said, "Oh, well, it was
a great idea, but you know,
456
00:34:09,827 --> 00:34:12,590
"great ideas often fall
flat on their face."
457
00:34:12,591 --> 00:34:15,678
And my reaction, of course,
was, "Well, we'll see what
458
00:34:15,679 --> 00:34:17,762
"falls flat on its face."
459
00:34:24,259 --> 00:34:26,893
Parker had to wait five
years for his theory
460
00:34:26,894 --> 00:34:28,311
to be vindicated.
461
00:34:30,516 --> 00:34:35,299
In 1962, the Mariner II probe
to Venus provided the evidence
462
00:34:35,300 --> 00:34:38,717
showing that Parker just had to be right.
463
00:34:46,585 --> 00:34:50,310
The world's first interplanetary
probe signaled back
464
00:34:50,311 --> 00:34:54,536
that space is awash with the
solar wind, exceeding even
465
00:34:54,537 --> 00:34:57,184
Eugene Parker's estimates.
466
00:34:57,185 --> 00:35:01,839
The JPL plasma detector simply
showed there was a wind
467
00:35:01,840 --> 00:35:06,773
of anywhere from 300 to 800
kilometers per second,
468
00:35:06,774 --> 00:35:09,119
and the wind was always
there and it never ceased,
469
00:35:09,120 --> 00:35:10,118
and that was it.
470
00:35:10,119 --> 00:35:13,701
I refused to argue with anybody after that.
471
00:35:15,621 --> 00:35:17,819
Modern space telescopes revealed
472
00:35:17,820 --> 00:35:21,674
the complexity of Parker's solar wind.
473
00:35:21,675 --> 00:35:25,122
From the Sun's equator, a
constant stream of particles
474
00:35:25,123 --> 00:35:26,956
evaporates into space.
475
00:35:28,048 --> 00:35:31,472
Occasionally, violent gusts
break free of the Sun's
476
00:35:31,473 --> 00:35:34,306
gravitational and magnetic forces.
477
00:35:35,432 --> 00:35:39,344
These are the flares and
coronal mass ejections
478
00:35:39,345 --> 00:35:41,512
first witnessed by SkyLab.
479
00:35:42,805 --> 00:35:45,811
These electrically charged
hurricanes are ferocious
480
00:35:45,812 --> 00:35:49,979
and brutal, and the planets
lie in their firing line.
481
00:35:52,720 --> 00:35:56,306
Mercury, the closest planet
to the Sun, bears the full
482
00:35:56,307 --> 00:35:58,976
brunt of the solar wind.
483
00:35:58,977 --> 00:36:02,309
Any atmosphere this moonlight
world may once have had
484
00:36:02,310 --> 00:36:05,559
has long been blown away,
leaving its surface bathed
485
00:36:05,560 --> 00:36:07,227
in deadly radiation.
486
00:36:09,531 --> 00:36:12,897
Mars is larger than Mercury,
and four times further from
487
00:36:12,898 --> 00:36:16,415
the Sun, and yet, even here,
it is thought that the solar
488
00:36:16,416 --> 00:36:19,259
wind has stripped away up to a third
489
00:36:19,260 --> 00:36:21,510
of its original atmosphere.
490
00:36:24,020 --> 00:36:27,351
Venus, our nearest neighbor,
has an atmosphere many times
491
00:36:27,352 --> 00:36:30,648
thicker than the Earth, but
probes have discovered its
492
00:36:30,649 --> 00:36:34,352
clouds are also being eroded by solar wind,
493
00:36:34,353 --> 00:36:37,881
creating a comet-like tail that
stretches back to the orbit
494
00:36:37,882 --> 00:36:38,965
of the Earth.
495
00:36:42,306 --> 00:36:44,778
But what of our own atmosphere?
496
00:36:44,779 --> 00:36:48,516
The Earth's magnetic field
stretches far into space,
497
00:36:48,517 --> 00:36:51,848
and fights a constant battle
with the Sun to deflect
498
00:36:51,849 --> 00:36:56,016
the solar wind and protect
our atmosphere from erosion.
499
00:36:59,791 --> 00:37:02,692
As the solar wind and the
Earth's magnetic field is
500
00:37:02,693 --> 00:37:07,336
steadily battling against
it's other magnet field,
501
00:37:07,337 --> 00:37:12,084
is being compressed by the solar
wind, and as this pressure
502
00:37:12,085 --> 00:37:16,252
increases and sends the particles
along the magnetic fields,
503
00:37:17,322 --> 00:37:20,200
and down to the polar areas
of the Earth, and we see the
504
00:37:20,201 --> 00:37:23,951
most light as Aurora in
the upper atmosphere.
505
00:37:28,386 --> 00:37:31,601
It's clear that we live in
a region dominated by the
506
00:37:31,602 --> 00:37:34,561
solar wind, which extends far
out into space, far beyond
507
00:37:34,562 --> 00:37:36,062
the outer planets.
508
00:37:37,059 --> 00:37:40,262
The next question is how far
out into space does the solar
509
00:37:40,263 --> 00:37:43,304
wind extend, as is spreads
out, going farther and farther
510
00:37:43,305 --> 00:37:44,388
from the Sun?
511
00:37:47,136 --> 00:37:50,096
To try and measure the
solar wind, scientists
512
00:37:50,097 --> 00:37:52,394
relied on space probes.
513
00:37:52,395 --> 00:37:55,506
From as far away as Jupiter,
these recorded massive
514
00:37:55,507 --> 00:37:56,840
radio emissions.
515
00:37:58,142 --> 00:38:01,555
The noise was being generated
by a battle between Jupiter's
516
00:38:01,556 --> 00:38:04,389
magnetic field and the solar wind.
517
00:38:05,538 --> 00:38:09,113
As the spacecraft Voyager
visited all the outer planets,
518
00:38:09,114 --> 00:38:12,944
it picked up the same telltale
signature of solar wind
519
00:38:12,945 --> 00:38:15,112
buffeting magnetic fields.
520
00:38:17,461 --> 00:38:20,131
When it left Neptune, it
was still accompanied
521
00:38:20,132 --> 00:38:21,632
by the solar wind.
522
00:38:23,998 --> 00:38:28,443
Three years beyond Pluto, it
detected a mysterious burst
523
00:38:28,444 --> 00:38:29,777
of radio energy.
524
00:38:47,763 --> 00:38:50,282
The signals were picked up
at the tracking station at
525
00:38:50,283 --> 00:38:53,862
Goldstone, California, where
Don Gurnett had been keeping
526
00:38:53,863 --> 00:38:55,696
in touch with Voyager.
527
00:38:57,114 --> 00:39:00,120
Well, my primary interest
these days is to follow the
528
00:39:00,121 --> 00:39:03,243
solar wind as it expands out from the Sun.
529
00:39:03,244 --> 00:39:06,343
We know that it has to be
stopped someplace by the
530
00:39:06,344 --> 00:39:10,511
interstellar gas, and this
boundary we call the heliopause.
531
00:39:16,189 --> 00:39:19,067
The radio burst picked up by Voyager
532
00:39:19,068 --> 00:39:21,235
was completely unexpected.
533
00:39:22,145 --> 00:39:26,312
There were no giant planets
within three billion kilometers.
534
00:39:27,625 --> 00:39:29,934
We did not, at first, really
know for sure the origin
535
00:39:29,935 --> 00:39:32,361
of this thing, and we thought
it might be coming from
536
00:39:32,362 --> 00:39:34,543
a planet such as Jupiter or Saturn.
537
00:39:34,544 --> 00:39:36,517
It also occurred to us
that it may be coming from
538
00:39:36,518 --> 00:39:39,101
much farther away from the Sun.
539
00:39:42,648 --> 00:39:45,108
In the end, their search
led them back to the
540
00:39:45,109 --> 00:39:47,276
heart of the Solar System.
541
00:39:49,591 --> 00:39:53,572
We noticed that there was a
series of extremely powerful
542
00:39:53,573 --> 00:39:57,740
coronal mass ejections some 400
days before the radio burst.
543
00:39:59,204 --> 00:40:00,770
Checking through Voyager's log,
544
00:40:00,771 --> 00:40:03,487
Gurnett found that it had been
overtaken by the outburst
545
00:40:03,488 --> 00:40:05,461
after 100 days.
546
00:40:05,462 --> 00:40:08,328
Ten months later, the solar
gust reached some kind
547
00:40:08,329 --> 00:40:10,674
of magnetic boundary.
548
00:40:10,675 --> 00:40:14,842
Was this the heliopause, the
outer limit of the solar wind?
549
00:40:15,678 --> 00:40:19,764
So our basic model is that
this coronal mass ejection
550
00:40:19,765 --> 00:40:23,642
produced a pulse of plasma
that came out from the Sun
551
00:40:23,643 --> 00:40:27,763
and propagated for 400 days;
we detected it going by
552
00:40:27,764 --> 00:40:30,051
Voyager I and Voyager II.
553
00:40:30,052 --> 00:40:34,579
And that pulse of plasma
eventually reached the heliopause
554
00:40:34,580 --> 00:40:37,760
and caused the radio emission.
555
00:40:37,761 --> 00:40:40,151
The radio burst places the heliopause
556
00:40:40,152 --> 00:40:43,152
at four times the distance of Pluto.
557
00:40:44,111 --> 00:40:47,861
This is how far the power
of our Sun extends.
558
00:40:52,087 --> 00:40:55,500
Even the most distant planets,
where the Sun appears
559
00:40:55,501 --> 00:40:58,414
as little more than a bright star,
560
00:40:58,415 --> 00:41:01,415
bathe in its evaporating atmosphere.
561
00:41:02,687 --> 00:41:05,984
The planets are bound by
the gravity of our Sun.
562
00:41:05,985 --> 00:41:10,128
They were formed as a
byproduct of its creation.
563
00:41:10,129 --> 00:41:14,192
On at least one of them,
the Sun sustains life.
564
00:41:14,193 --> 00:41:17,477
But our Sun, along with the
billions of other stars,
565
00:41:17,478 --> 00:41:19,823
has a more fundamental significance
566
00:41:19,824 --> 00:41:21,157
for the planets.
567
00:41:22,180 --> 00:41:24,763
And this lies at its very core.
568
00:41:29,042 --> 00:41:33,429
The Sun's core is the
ultimate nuclear reactor.
569
00:41:33,430 --> 00:41:36,680
Douglas Gough wants to see it in action.
570
00:41:36,681 --> 00:41:40,964
My ultimate goal is mainly
to learn about the structure
571
00:41:40,965 --> 00:41:44,993
of the core, because the nuclear
physics is so interesting.
572
00:41:44,994 --> 00:41:48,894
The nuclear reactions that
change material that produce
573
00:41:48,895 --> 00:41:53,747
new particles that leave the
Sun, understanding that
574
00:41:53,748 --> 00:41:56,870
helps us to understand the basic physics
575
00:41:56,871 --> 00:41:58,621
of elementary matter.
576
00:42:06,066 --> 00:42:09,769
1995 saw the launch of a new era of solar
577
00:42:09,770 --> 00:42:13,960
exploration: the start of the
journey that may yet take us
578
00:42:13,961 --> 00:42:16,128
to the heart of the stars.
579
00:42:26,358 --> 00:42:31,024
The solar observatory SOHO
can view the Sun in x-rays,
580
00:42:31,025 --> 00:42:33,608
ultraviolet, and visible light.
581
00:42:46,188 --> 00:42:49,438
But SOHO carries an additional feature:
582
00:42:52,318 --> 00:42:56,496
in 1975, when Douglas Gough
learned that the Sun's surface
583
00:42:56,497 --> 00:42:59,956
rippled like a pond, he instantly saw a way
584
00:42:59,957 --> 00:43:01,707
to see into its core.
585
00:43:04,438 --> 00:43:07,027
What I realized is that
this is a way of seeing
586
00:43:07,028 --> 00:43:08,919
inside the Sun.
587
00:43:08,920 --> 00:43:11,775
You can't see inside the Sun with light,
588
00:43:11,776 --> 00:43:13,725
because it's opaque.
589
00:43:13,726 --> 00:43:15,362
But this was really sound.
590
00:43:15,363 --> 00:43:17,383
You could hear inside the Sun.
591
00:43:17,384 --> 00:43:20,227
And by hearing inside the
Sun, you could learn what the
592
00:43:20,228 --> 00:43:23,606
structure of the Sun is inside,
and this was an amazing
593
00:43:23,607 --> 00:43:27,774
concept for me, that you could
actually get inside a star.
594
00:43:28,994 --> 00:43:31,849
The surface of the Sun was heaving.
595
00:43:31,850 --> 00:43:36,017
Every six minutes, the entire
star breathes in and out.
596
00:43:37,771 --> 00:43:42,530
Its gaseous ocean swells and
dips, and a complex pattern
597
00:43:42,531 --> 00:43:46,558
of ripples shimmers across
its surface, providing clues
598
00:43:46,559 --> 00:43:48,892
to the hidden world beneath.
599
00:43:51,273 --> 00:43:54,233
The Sun is like a chorus
of people, of instruments,
600
00:43:54,234 --> 00:43:57,042
playing, but not in tune.
601
00:43:57,043 --> 00:43:57,876
They're all very different.
602
00:43:57,877 --> 00:44:00,641
It's cacophonous, which gives
us lots of information about
603
00:44:00,642 --> 00:44:02,812
the detailed interior.
604
00:44:02,813 --> 00:44:05,819
The sound waves move back
and forth inside the Sun,
605
00:44:05,820 --> 00:44:10,080
and give tones, just like the
tones of a musical instrument.
606
00:44:10,081 --> 00:44:14,631
Already, SOHO has revealed
new surface phenomena.
607
00:44:14,632 --> 00:44:18,672
In the aftermath of a solar
flare, seismic quakes spread
608
00:44:18,673 --> 00:44:21,864
out for thousands of kilometers.
609
00:44:21,865 --> 00:44:24,365
We've learned a great deal
about the outside of the Sun
610
00:44:24,366 --> 00:44:28,684
from studying the seismic waves from SOHO.
611
00:44:28,685 --> 00:44:30,286
We've learned about the dynamics.
612
00:44:30,287 --> 00:44:32,875
We've learned about the
chemical composition.
613
00:44:32,876 --> 00:44:37,043
Now we want to do something
similar in the very core.
614
00:44:37,973 --> 00:44:41,469
SOHO has stripped away the
outer layers of the Sun.
615
00:44:43,348 --> 00:44:47,051
Beneath the surface, it has
discovered rivers of plasma,
616
00:44:47,052 --> 00:44:50,302
superheated gases that circle its pole.
617
00:44:56,700 --> 00:44:58,835
Looking like a jet stream on Earth,
618
00:44:58,836 --> 00:45:01,669
it seems the Sun has weather, too.
619
00:45:04,618 --> 00:45:08,785
But deep in the core is a
remarkable chemical factory.
620
00:45:10,132 --> 00:45:12,604
The stars generate stuff.
621
00:45:12,605 --> 00:45:15,855
They make all the matter
that you and I are made of,
622
00:45:15,856 --> 00:45:18,409
from hydrogen and helium, but
they make this heavy stuff
623
00:45:18,410 --> 00:45:20,174
that we are made of.
624
00:45:20,175 --> 00:45:23,297
They're the factories that make material.
625
00:45:23,298 --> 00:45:27,430
So to understand the Universe,
we need to study the stars.
626
00:45:27,431 --> 00:45:31,598
Every star has a core, almost
all stars are generating
627
00:45:33,561 --> 00:45:37,705
nuclear energy, transmuting
elements from one to another,
628
00:45:37,706 --> 00:45:39,934
building up the heavy elements,
the whole building blocks
629
00:45:39,935 --> 00:45:41,130
of the Universe.
630
00:45:41,131 --> 00:45:43,568
We believe the physics in those
stars is the same as the
631
00:45:43,569 --> 00:45:45,019
physics on Earth.
632
00:45:45,020 --> 00:45:47,434
This physics we need to
understand more carefully,
633
00:45:47,435 --> 00:45:49,907
so that under extreme
conditions we can work out what
634
00:45:49,908 --> 00:45:51,463
that physics implies.
635
00:45:51,464 --> 00:45:54,129
On a very large scale,
what it implies about
636
00:45:54,130 --> 00:45:55,079
the structure of the Universe,
637
00:45:55,080 --> 00:45:57,996
and how the whole Universe evolves.
638
00:45:59,166 --> 00:46:01,185
In the beginning, the Universe contained
639
00:46:01,186 --> 00:46:03,269
just hydrogen and helium.
640
00:46:06,120 --> 00:46:09,486
For 12 billion years, stars
have been transforming these
641
00:46:09,487 --> 00:46:13,259
simple gases into more complex elements.
642
00:46:13,260 --> 00:46:16,177
Our Sun was born from that process.
643
00:46:20,273 --> 00:46:24,126
Four and a half billion years
ago, a massive star on the
644
00:46:24,127 --> 00:46:28,294
fringes of our galaxy ended
its existence as a supernova.
645
00:46:34,112 --> 00:46:37,327
Its death throes sent the
contents of its core spraying
646
00:46:37,328 --> 00:46:38,995
outwards into space.
647
00:46:41,206 --> 00:46:44,897
These superheated grains of
silicon, iron, and many other
648
00:46:44,898 --> 00:46:48,623
elements careered into a
neighboring cloud of gas,
649
00:46:48,624 --> 00:46:50,541
causing it to collapse.
650
00:47:04,170 --> 00:47:07,873
As the mixture of gas and dust
gravitated towards the center
651
00:47:07,874 --> 00:47:12,354
of the cloud, they ignited a
nuclear reaction, and our Sun
652
00:47:12,355 --> 00:47:13,688
burst into life.
653
00:47:17,998 --> 00:47:21,491
Around it, the remaining debris
from the supernova combined
654
00:47:21,492 --> 00:47:23,159
to form the planets.
655
00:47:28,215 --> 00:47:32,382
We are made of stardust,
forged in the heart of a star.
656
00:47:34,403 --> 00:47:39,243
In the last 400 years, science
has peeled back the blinding
657
00:47:39,244 --> 00:47:44,166
layers of our Sun to reveal a
star, one of the countless
658
00:47:44,167 --> 00:47:47,602
engines of creation which made the planets,
659
00:47:47,603 --> 00:47:49,103
and which made us.
660
00:48:00,270 --> 00:48:04,353
Our ancestors saw a perfect
disc of light; a god.
661
00:48:06,098 --> 00:48:10,485
But modern science has revealed
an entity for more complex
662
00:48:10,486 --> 00:48:14,189
and powerful than those
ancient humans could ever
663
00:48:14,190 --> 00:48:16,107
have believed possible.
55651
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