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We were born into a mystery...
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one that has haunted us since at
least as long as we've been human.
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We awakened on this tiny
world beneath a blanket of stars...
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like an abandoned
baby left on a doorstep...
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without a note to explain where
we came from, who we are...
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00:01:56,082 --> 00:01:58,762
how our universe came to be...
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and with no idea how to
end our cosmic isolation.
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00:02:03,483 --> 00:02:07,643
We've had to figure
it all out for ourselves.
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00:02:11,964 --> 00:02:15,323
Best thing we had going
for us was our intelligence...
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00:02:15,484 --> 00:02:18,884
especially our gift for
pattern recognition...
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00:02:19,044 --> 00:02:21,084
sharpened over
eons of evolution.
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00:02:21,885 --> 00:02:24,765
The ones who were good at
spotting prey and predator...
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00:02:24,924 --> 00:02:27,524
telling poisonous plants
from the nourishing ones...
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00:02:27,685 --> 00:02:30,605
had a better chance
to live and reproduce.
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00:02:30,765 --> 00:02:34,045
They survived and passed on
those genes for pattern recognition...
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00:02:34,206 --> 00:02:36,126
with its obvious advantages.
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00:02:36,566 --> 00:02:40,886
Cultures all over the planet
looked up at the same stars...
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00:02:41,046 --> 00:02:44,326
and found different
pictures there.
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00:02:50,207 --> 00:02:53,047
We used this gift for
recognizing patterns in nature...
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00:02:53,207 --> 00:02:56,327
to read the calendar in the sky.
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00:02:58,407 --> 00:03:02,488
The messages written in the stars
told our forefathers and mothers...
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00:03:02,647 --> 00:03:05,448
when to camp and
when to move on...
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00:03:05,608 --> 00:03:08,929
when the migratory herds and when
the rains and the cold would come...
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00:03:09,088 --> 00:03:11,129
and when they would
cease for a time.
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00:03:11,288 --> 00:03:14,369
When they observed the connection
between the motions of the stars...
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00:03:14,529 --> 00:03:16,569
and the seasonal
cycles of life on Earth...
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00:03:16,729 --> 00:03:19,890
the y concluded, naturally,
that what happens up there...
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00:03:20,050 --> 00:03:22,610
must be directed
at us down here.
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00:03:22,770 --> 00:03:24,169
It makes sense, right?
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00:03:24,329 --> 00:03:28,410
If the sky was a calendar and somebody
stuck a Post-it note on top of it...
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00:03:28,570 --> 00:03:31,770
what else could it
be but a message?
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00:03:32,450 --> 00:03:35,010
And so when the heavenly
order was suddenly violated...
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by the apparition of a comet in
the sky, they took it personally.
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00:03:40,051 --> 00:03:41,731
Can we really blame them?
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00:03:41,891 --> 00:03:45,731
Back then, they had no other logical
explanation for what was happening.
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00:03:45,891 --> 00:03:48,692
This was long before anyone
had yet to imagine Earth...
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as a spinning planet with a tilted
axis, revolving around the sun.
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00:03:52,772 --> 00:03:56,373
Every ancient human culture
made the same mistake:
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00:03:56,533 --> 00:04:01,092
The comet must be a message
sent by the gods, or one particular god.
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00:04:01,253 --> 00:04:07,973
And almost invariably our ancestors
concluded the news was not good.
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00:04:08,133 --> 00:04:14,854
It didn't matter if you were an ancient
Aztec, Anglo-Saxon, Babylonian, Hindu.
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00:04:15,174 --> 00:04:18,335
Comets were portents of doom.
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The only difference among them was
the precise nature of the coming disaster.
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00:04:23,974 --> 00:04:28,535
"Disaster, " as in the
Greek word for "bad star."
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00:04:28,695 --> 00:04:31,975
To the Masai of East
Africa, a comet meant famine.
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00:04:32,135 --> 00:04:34,896
To the Zulu in the
south, it meant war.
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00:04:35,056 --> 00:04:38,375
To the Eghap people of
the west, it meant disease.
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00:04:38,536 --> 00:04:43,017
To the Djaga of Zaire,
specifically smallpox.
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00:04:43,176 --> 00:04:48,656
To their neighbors, the Lube, a
comet foretold the death of a leader.
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00:04:48,816 --> 00:04:52,297
The ancient Chinese
were remarkably systematic.
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00:04:53,337 --> 00:04:55,817
Starting in roughly 1400 BC...
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00:04:55,977 --> 00:04:59,937
they began recording and
cataloging the apparitions of comets.
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00:05:00,098 --> 00:05:03,218
A three-tailed comet
meant calamity for the state.
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00:05:03,378 --> 00:05:07,258
A four-tailed comet signified
an epidemic was coming.
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00:05:07,419 --> 00:05:11,379
The human talent for pattern
recognition is a two-edged sword.
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00:05:11,539 --> 00:05:16,459
We're especially good at finding patterns
even when they aren't really there...
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00:05:16,620 --> 00:05:20,420
something known as
"false pattern recognition."
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00:05:22,979 --> 00:05:25,019
We hunger for significance...
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00:05:25,180 --> 00:05:30,540
for signs that our personal existence
is of special meaning to the universe.
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00:05:32,261 --> 00:05:36,581
To that end, we're all too eager
to deceive ourselves and others...
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00:05:36,741 --> 00:05:39,661
to discern a sacred image
in a grilled cheese sandwich...
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00:05:39,821 --> 00:05:42,861
or find a divine
warning in a comet.
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00:05:43,021 --> 00:05:45,422
Today we know exactly
where comets come from...
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and what they're made of.
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00:05:50,382 --> 00:05:52,262
Our Ship of the Imagination...
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00:05:52,423 --> 00:05:55,823
fueled by equal parts
of science and wonder...
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00:05:55,983 --> 00:05:59,623
can take us anywhere
in space and time.
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00:05:59,783 --> 00:06:01,383
It can travel
faster than light...
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00:06:01,543 --> 00:06:05,103
and render visible those
things that cannot be seen.
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00:06:05,263 --> 00:06:10,744
It's carrying us to a mysterious realm
that lies one light-year from the sun.
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00:06:10,904 --> 00:06:13,104
What is this swarm of worlds?
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00:06:13,264 --> 00:06:15,504
Was it organized
by alien beings?
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00:06:15,664 --> 00:06:18,185
No, just gravity.
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00:06:18,345 --> 00:06:20,625
These are the
snows of yesteryear.
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00:06:20,785 --> 00:06:23,465
Drifting mountains
of ice and rock.
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00:06:23,625 --> 00:06:26,385
The preserved remnants of
the birth of the solar system.
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It's called the Oort
cloud, after Jan Oort...
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00:06:29,945 --> 00:06:34,306
the Dutch astronomer who
foretold its existence back in 1950.
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00:06:34,466 --> 00:06:36,546
He was trying to
solve a paradox.
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00:06:36,706 --> 00:06:39,826
There's so many
ways for comets to die.
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00:06:39,986 --> 00:06:44,146
Because they cross the orbits of planets,
comets frequently collide with them.
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Comets are largely made of ice, so
every time they come near the sun...
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they lose a part of themselves
through evaporation.
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00:06:51,948 --> 00:06:55,947
And after several thousand
trips, their ice is all gone...
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00:06:56,107 --> 00:06:58,708
and what remains of the
comet is now an asteroid.
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00:06:58,868 --> 00:07:01,708
Comets can be gravitationally
ejected from the solar system...
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00:07:01,868 --> 00:07:03,388
and exiled into space.
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00:07:03,548 --> 00:07:07,309
And yet somehow the
comets keep coming.
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00:07:07,468 --> 00:07:11,509
Oort and other astronomers wondered,
"Where do all the comets come from?"
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00:07:13,789 --> 00:07:16,549
Oort calculated the rate at
which new comets appear...
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00:07:16,709 --> 00:07:20,590
and concluded that there must
be a vast spherical swarm of them...
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a few light-years across,
surrounding the sun.
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00:07:27,751 --> 00:07:29,590
Oort's logic still holds up...
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even after all the discoveries
we've made about comets...
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and the solar system in
the many decades since.
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00:07:35,271 --> 00:07:40,752
And yet the Oort cloud is a
sight that no one has ever seen.
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Nor could we.
It's dark out here.
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00:07:44,192 --> 00:07:47,072
And each comet is about as
far from its closest neighbor...
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00:07:47,231 --> 00:07:49,032
as the Earth is from Saturn.
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00:07:49,192 --> 00:07:52,312
But science gives us
special powers of our own.
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00:07:52,472 --> 00:07:55,912
It gave Jan Oort
the gift of prophecy.
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Oort was also the first
to correctly estimate...
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00:07:58,673 --> 00:08:01,593
the distance between the sun
and the center of our galaxy.
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00:08:02,233 --> 00:08:05,753
That's a big deal, finding out
where we are in the Milky Way.
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00:08:05,913 --> 00:08:10,074
Our star is about 30, 000
light-years from the center.
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00:08:10,234 --> 00:08:12,794
Oort was also the first guy
to use a radio telescope...
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00:08:12,954 --> 00:08:15,154
to map the galaxy's
spiral structure.
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00:08:15,714 --> 00:08:21,355
And he discovered that the center of our
galaxy was a place of titanic explosions...
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the first indication
that there might have
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been a supermassive
black hole lurking there.
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00:08:26,195 --> 00:08:29,115
Does the fact that most of us
know the names of mass murderers...
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00:08:29,275 --> 00:08:33,716
but have never heard of Jan
Oort, say anything about us?
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00:08:42,477 --> 00:08:44,477
The Oort cloud is so enormous...
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00:08:44,637 --> 00:08:47,477
that it takes one of its
comets about a million years...
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00:08:47,637 --> 00:08:51,157
to complete a single
trip around the sun.
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00:08:53,117 --> 00:08:55,638
Out here at the far edge
of the solar system...
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00:08:55,798 --> 00:08:58,758
even a little tug from the
gravity of a passing star...
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00:08:58,918 --> 00:09:04,038
can liberate some of these comets from
their gravitational bondage to the sun.
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00:09:07,198 --> 00:09:11,359
Some comets are flung out of the
solar system to wander interstellar space.
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00:09:11,519 --> 00:09:15,000
But for others
there's a different fate.
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00:09:20,960 --> 00:09:25,600
This one is plunging towards the sun,
gaining speed in an unbroken free fall...
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00:09:25,760 --> 00:09:28,880
that lasts hundreds
of thousands of years.
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00:09:29,681 --> 00:09:35,361
When Neptune's gravity gives it another
tug, there's a small change in course.
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00:09:35,521 --> 00:09:39,402
Mighty Jupiter, the most massive object
in our solar system other than the sun...
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00:09:39,561 --> 00:09:42,762
attracts the comet with its
powerful gravitational pull...
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00:09:42,922 --> 00:09:45,282
bending its path.
127
00:09:48,122 --> 00:09:52,163
When our comet reaches
the inner solar system...
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00:09:53,562 --> 00:09:57,043
heat from the sun bakes it.
129
00:10:04,443 --> 00:10:07,563
A beautiful
transformation begins.
130
00:10:07,724 --> 00:10:12,804
The barren, sooty iceberg
now sports a glowing halo...
131
00:10:13,604 --> 00:10:15,524
and a tail.
132
00:10:22,085 --> 00:10:24,925
These layers tell the story
of how the comet was made...
133
00:10:25,086 --> 00:10:28,086
some 4 billion years ago.
134
00:10:32,206 --> 00:10:35,046
During the 40,000
generations of humanity...
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00:10:35,206 --> 00:10:40,287
there must have been roughly
100,000 apparitions of a bright comet.
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00:10:40,766 --> 00:10:45,927
For all that time, the best we could
do was look up in helpless wonder...
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00:10:46,087 --> 00:10:49,127
prisoners of Earth with nowhere
to turn for an explanation...
138
00:10:49,287 --> 00:10:52,088
beyond our guilt and our fears.
139
00:10:52,967 --> 00:10:56,008
But then a friendship
began between two men...
140
00:10:56,168 --> 00:10:59,888
that led to a permanent
revolution in human thought.
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00:11:00,848 --> 00:11:03,808
Isaac Newton and Edmond
Halley could not know it...
142
00:11:03,968 --> 00:11:07,208
but their collaboration
would ultimately set us free...
143
00:11:07,369 --> 00:11:11,850
from our long confinement
on this tiny world.
144
00:11:17,929 --> 00:11:22,490
The comet of 1664 sent shivers
of dread throughout Europe.
145
00:11:22,650 --> 00:11:24,770
And the terror
seemed justified...
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00:11:24,930 --> 00:11:28,490
when the plague and the Great
Fire of London followed soon after.
147
00:11:29,891 --> 00:11:33,011
There, with long bloody hair...
148
00:11:33,171 --> 00:11:36,691
a blazing star
threatens the world...
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00:11:36,851 --> 00:11:41,612
with famine, plague and war.
150
00:11:42,451 --> 00:11:45,492
To princes, it spells death.
151
00:11:46,092 --> 00:11:49,092
To kingdoms, many crosses.
152
00:11:50,412 --> 00:11:53,452
To all estates,
inevitable losses.
153
00:11:54,293 --> 00:11:56,173
To herdsmen, rot.
154
00:11:56,333 --> 00:11:58,733
To plowmen, hapless seasons.
155
00:11:59,773 --> 00:12:03,134
To sailors, it brings storms.
156
00:12:04,614 --> 00:12:08,494
To cities, civil treasons.
157
00:12:14,095 --> 00:12:15,335
But for one child...
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00:12:16,175 --> 00:12:19,055
the comet was not
the least bit frightening.
159
00:12:23,856 --> 00:12:27,215
For him, it was
a thing of wonder.
160
00:12:27,376 --> 00:12:31,096
Like all of us, Edmond
Halley was born curious.
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00:12:31,256 --> 00:12:32,896
Hell's bells.
162
00:12:33,737 --> 00:12:37,577
He was lucky to have a father who
encouraged and nurtured his curiosity...
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00:12:37,736 --> 00:12:41,777
buying him the best scientific instruments,
and even funding his expedition...
164
00:12:41,937 --> 00:12:45,457
to make the first accurate star
map of the Southern Hemisphere.
165
00:12:45,617 --> 00:12:49,297
Halley dropped out of Oxford when
he was 20 and sailed to St. Helena...
166
00:12:49,458 --> 00:12:52,258
an island below the equator,
off the west coast of Africa.
167
00:12:58,419 --> 00:13:00,658
Hell's bells.
168
00:13:00,818 --> 00:13:03,859
Problem was, nobody told Halley
that the weather on St. Helena...
169
00:13:04,019 --> 00:13:07,659
was generally lousy. It took
him 12 frustrating months...
170
00:13:07,819 --> 00:13:12,179
to observe enough southern
stars to make a complete map.
171
00:13:12,940 --> 00:13:14,939
The gods and heroes
of ancient Greece...
172
00:13:15,100 --> 00:13:19,100
were now joined by the mythic
figures of a new world and age:
173
00:13:19,260 --> 00:13:23,980
a toucan, a compass,
a bird of paradise.
174
00:13:31,581 --> 00:13:34,101
When Halley came home
with the other half of the sky...
175
00:13:34,261 --> 00:13:36,301
his map created a sensation.
176
00:13:36,461 --> 00:13:39,142
Now merchants and explorers
could navigate by the stars...
177
00:13:39,302 --> 00:13:40,942
visible anywhere on Earth.
178
00:13:41,101 --> 00:13:43,222
At the time, the Royal
Society of London...
179
00:13:43,382 --> 00:13:46,023
was the world's clearinghouse
of scientific discovery.
180
00:13:46,182 --> 00:13:51,343
It's motto, "Nullius in verba," sums
up the heart of the scientific method.
181
00:13:51,503 --> 00:13:54,223
It's Latin for
"see for yourself."
182
00:13:54,383 --> 00:13:57,743
In other words,
question authority.
183
00:13:57,903 --> 00:14:01,784
Halley's star maps caught the attention
of the Society's curator of experiments.
184
00:14:01,943 --> 00:14:04,310
I'd show him to you if
I could, but no portrait
185
00:14:04,322 --> 00:14:06,304
of Robert Hooke
exists from his time...
186
00:14:06,464 --> 00:14:08,984
only the verbal descriptions
of his contemporaries.
187
00:14:09,144 --> 00:14:12,185
They called him
"lean, bent, ugly."
188
00:14:12,345 --> 00:14:15,384
He was possibly the most
inventive person who ever lived.
189
00:14:15,544 --> 00:14:20,105
And despite his appearance, he was the most
sought-after party guest in all of London.
190
00:14:20,265 --> 00:14:26,746
Why? Hooke's insatiable curiosity
encompassed absolutely everything.
191
00:14:28,106 --> 00:14:30,506
Hooke discovered
a little cosmos...
192
00:14:30,666 --> 00:14:34,746
and we still call it by the
name he gave it: the cell.
193
00:14:34,906 --> 00:14:36,824
Hooke discovered
the cell by looking at a
194
00:14:36,835 --> 00:14:38,947
piece of cork with one
of his own inventions:
195
00:14:39,106 --> 00:14:40,667
the compound microscope.
196
00:14:41,267 --> 00:14:46,827
He anticipated aspects of Darwin's
theory of evolution by almost 200 years.
197
00:14:46,987 --> 00:14:48,828
Hooke also improved
the telescope.
198
00:14:48,987 --> 00:14:51,748
The drawings he made of the
astronomical bodies he observed...
199
00:14:51,908 --> 00:14:54,148
attest to his uncanny precision.
200
00:14:54,308 --> 00:14:58,108
After the Great Fire destroyed
central London in 1666...
201
00:14:58,269 --> 00:15:00,788
Hooke partnered with the
architect Christopher Wren...
202
00:15:00,948 --> 00:15:02,549
to redesign and
rebuild the city.
203
00:15:03,268 --> 00:15:07,229
Hooke was the foremost
experimentalist of his age.
204
00:15:07,389 --> 00:15:10,630
Using coiled springs, he
derived the law of elasticity...
205
00:15:10,789 --> 00:15:13,390
known today as Hooke's law.
206
00:15:13,549 --> 00:15:17,270
He perfected the air pump, the
height of technology in its time...
207
00:15:17,430 --> 00:15:21,110
and used it to experiment
on respiration and sound.
208
00:15:21,270 --> 00:15:23,911
And he experimented
with cannabis.
209
00:15:24,071 --> 00:15:26,231
He reported to a meeting
of the Royal Society...
210
00:15:26,391 --> 00:15:30,951
that a sea captain friend of his, quote,
"had so often experimented with it...
211
00:15:31,111 --> 00:15:36,432
that there is no cause of fear, though
possibly there may be of laughter."
212
00:15:39,912 --> 00:15:43,992
But coffee was the drug of choice
for England in the 17th century.
213
00:15:44,152 --> 00:15:46,632
Coffeehouses sprang
up all over London.
214
00:15:58,313 --> 00:16:00,674
This is where people
came to get news...
215
00:16:00,834 --> 00:16:03,554
to launch new ventures,
and to debate ideas.
216
00:16:04,034 --> 00:16:09,315
The coffeehouse was an oasis of
equality in a class-obsessed society.
217
00:16:09,794 --> 00:16:14,395
Here a poor man needn't give up his seat
to a rich man, nor submit to his opinion.
218
00:16:14,555 --> 00:16:16,835
It was a kind of
laboratory of democracy.
219
00:16:17,435 --> 00:16:19,395
In this highly
caffeinated atmosphere...
220
00:16:20,156 --> 00:16:24,556
Halley and Hooke met Christopher
Wren to discuss a deep mystery:
221
00:16:24,715 --> 00:16:27,595
Why do the planets
move as they do?
222
00:16:27,756 --> 00:16:31,157
The astronomer Johannes Kepler had
demonstrated some 80 years before...
223
00:16:31,677 --> 00:16:33,916
that the orbits of the
planets around the sun...
224
00:16:34,076 --> 00:16:37,117
were not perfect circles,
but actually ellipses...
225
00:16:37,277 --> 00:16:42,877
and that the closer a planet
was to the sun, the faster it moved.
226
00:16:43,797 --> 00:16:46,517
Why? Could some
invisible force from the sun
227
00:16:46,529 --> 00:16:49,078
be responsible for
this change in motion?
228
00:16:49,238 --> 00:16:51,038
If so, how did it work?
229
00:16:51,198 --> 00:16:53,958
Could there be a simple
mathematical law to describe it?
230
00:16:54,118 --> 00:16:57,719
Maybe something like
Hooke's law of elasticity?
231
00:17:01,599 --> 00:17:02,759
Perhaps.
232
00:17:02,919 --> 00:17:06,959
But try as he might, Christopher
Wren couldn't figure it out.
233
00:17:07,119 --> 00:17:09,759
Damned if I haven't
tried. It's beyond me.
234
00:17:09,920 --> 00:17:13,160
I'll wager a book worth 40
shillings to the man who can solve it.
235
00:17:13,320 --> 00:17:16,680
That book is mine, Mr. Wren.
I've already done the calculation.
236
00:17:16,840 --> 00:17:17,880
Halley was delighted.
237
00:17:18,040 --> 00:17:19,520
Show us, Mr. Hooke.
238
00:17:19,681 --> 00:17:22,880
But months passed, and
Hooke failed to deliver.
239
00:17:23,040 --> 00:17:24,681
He couldn't do the math.
240
00:17:24,841 --> 00:17:25,921
None of them could.
241
00:17:26,081 --> 00:17:28,881
Finally Halley had
enough of Hooke's excuses.
242
00:17:29,041 --> 00:17:33,601
Halley knew there must be someone,
somewhere, up to the challenge.
243
00:17:40,042 --> 00:17:42,762
What about that
mathematician at Cambridge?
244
00:17:42,922 --> 00:17:44,202
He was a clever fellow.
245
00:17:44,363 --> 00:17:47,803
He had solved central questions
about the nature of light years before...
246
00:17:47,963 --> 00:17:49,963
when he was still only 22.
247
00:17:50,123 --> 00:17:52,523
And he invented the
reflecting telescope.
248
00:17:52,683 --> 00:17:55,723
Odd bird. Dropped out
of sight a while back.
249
00:17:55,884 --> 00:17:58,924
Some squabble over Hooke
and his discovery about light.
250
00:17:59,083 --> 00:18:02,724
Went completely to pieces over it, has
been hiding out in Cambridge ever since.
251
00:18:02,884 --> 00:18:07,324
Halley wondered if this strange and, by
all accounts, exceedingly difficult man...
252
00:18:07,484 --> 00:18:10,364
might succeed where
Hooke and others had failed.
253
00:18:10,525 --> 00:18:14,085
What he couldn't know, what no one
could possibly imagine at the time...
254
00:18:14,245 --> 00:18:18,126
were the countless ways the world
would be forever changed by this meeting...
255
00:18:18,285 --> 00:18:22,046
on an August day in 1684.
256
00:18:29,846 --> 00:18:33,967
Isaac Newton was born in
England on Christmas Day in 1642.
257
00:18:35,767 --> 00:18:39,727
Before he even opened his
eyes, his father was already dead.
258
00:18:41,728 --> 00:18:45,968
His mother left him when he was
only 3 and did not return until he was 11.
259
00:18:47,848 --> 00:18:50,768
When she did, it was with
a new family and husband...
260
00:18:50,928 --> 00:18:54,849
a stepfather who
Isaac Newton despised.
261
00:18:58,729 --> 00:19:01,449
Newton's refuge from
his miserable family life...
262
00:19:01,609 --> 00:19:04,929
was his passion to
understand how things worked...
263
00:19:05,089 --> 00:19:08,129
especially nature itself.
264
00:19:08,290 --> 00:19:13,410
In 1661 the talented young Isaac entered
Trinity College at Cambridge University...
265
00:19:13,570 --> 00:19:16,811
where he was a
consistently lousy student...
266
00:19:16,971 --> 00:19:21,650
one without friends or a loving family to
provide any warmth or encouragement.
267
00:19:21,810 --> 00:19:25,171
Newton mostly kept to himself,
sequestered in his room...
268
00:19:25,331 --> 00:19:29,651
studying ancient Greek philosophers,
geometry and languages...
269
00:19:29,811 --> 00:19:36,051
and pondering deep questions on the
nature of matter, space, time and motion.
270
00:19:36,372 --> 00:19:40,293
This budding scientist was
also a passionate mystic.
271
00:19:40,452 --> 00:19:43,413
Newton believed that a secret
knowledge called alchemy...
272
00:19:43,573 --> 00:19:46,733
known only to a small group
of ancient philosophers...
273
00:19:46,892 --> 00:19:48,493
was waiting to be rediscovered.
274
00:19:49,173 --> 00:19:53,493
He hoped to learn how to change
ordinary metals into silver and gold...
275
00:19:53,653 --> 00:19:58,734
and maybe even cook up the
elixir of life, the key to immortality.
276
00:19:59,934 --> 00:20:04,734
He was also obsessed with finding
hidden messages in the words of the Bible.
277
00:20:06,055 --> 00:20:09,215
He combed through translations
in several different languages...
278
00:20:09,374 --> 00:20:13,975
hoping to decipher coded
instructions from God.
279
00:20:18,615 --> 00:20:23,056
He made elaborate calculations in an effort
to discover the date of the Second Coming.
280
00:20:25,016 --> 00:20:31,017
His lifelong research in alchemy and
biblical chronology never led anywhere.
281
00:20:34,657 --> 00:20:41,178
When Halley found Newton that fateful
day, he was living as a virtual recluse.
282
00:20:43,618 --> 00:20:46,778
Newton had gone into
hiding 13 years earlier...
283
00:20:46,938 --> 00:20:49,498
after Robert Hooke had
publicly accused Newton...
284
00:20:49,658 --> 00:20:53,298
of stealing his groundbreaking
work on light and color.
285
00:20:53,458 --> 00:20:57,859
In fact, it was Isaac Newton who solved
the mystery of the spectrum of light...
286
00:20:58,019 --> 00:20:59,899
not Robert Hooke.
287
00:21:00,059 --> 00:21:01,900
The wound was
painful and deep...
288
00:21:02,059 --> 00:21:04,419
and Newton resolved
to never expose himself...
289
00:21:04,579 --> 00:21:08,020
to that kind of public
humiliation ever again.
290
00:21:08,180 --> 00:21:11,780
Sir, I don't suppose you recall
our meeting a few years ago?
291
00:21:11,940 --> 00:21:13,580
Yes, Mr. Halley.
292
00:21:13,740 --> 00:21:15,181
I'm sorry to bother you.
293
00:21:15,341 --> 00:21:17,781
Never mind the
formalities. Get to your point.
294
00:21:17,941 --> 00:21:20,860
I've been talking with our
friends Mr. Wren and Mr. Hooke.
295
00:21:21,021 --> 00:21:23,821
That scoundrel Hooke's
no friend of mine.
296
00:21:23,981 --> 00:21:25,541
Yes, I understand, sir.
297
00:21:25,701 --> 00:21:30,301
But the thing is, we've been debating
the puzzling question of planetary motion.
298
00:21:30,461 --> 00:21:32,684
We all agree that some
force of attraction from
299
00:21:32,695 --> 00:21:34,742
the sun governs the
motions of the planets.
300
00:21:34,902 --> 00:21:37,543
We suspect there must
be a mathematical law...
301
00:21:37,702 --> 00:21:41,142
to describe how this force
changes with distance.
302
00:21:41,302 --> 00:21:42,583
And knowing of your skill...
303
00:21:42,743 --> 00:21:46,303
Yes, yes, the attraction of gravity
weakens with the square of the distance.
304
00:21:46,463 --> 00:21:48,703
That's why the planets
move in ellipses.
305
00:21:48,863 --> 00:21:51,264
But, sir, how can you know this?
306
00:21:51,423 --> 00:21:54,063
Why, I have calculated
it some five years ago.
307
00:21:54,224 --> 00:21:56,824
I beg you, show it to me.
308
00:21:56,984 --> 00:22:00,064
The calculation is
here somewhere.
309
00:22:00,224 --> 00:22:03,544
Well, no matter. I shall redo it
and be sure to send it on to you.
310
00:22:03,704 --> 00:22:08,225
This is stupendous. Why have
we not had word of it before?
311
00:22:08,385 --> 00:22:11,425
Newton remembered all too
well what Hooke had done to him...
312
00:22:11,585 --> 00:22:14,586
the last time he
put forth an idea.
313
00:22:15,065 --> 00:22:16,985
Just when Halley may
have begun to wonder...
314
00:22:17,146 --> 00:22:19,906
if Newton was bluffing, as
Hooke had done earlier...
315
00:22:20,066 --> 00:22:23,386
a messenger arrived with
an envelope from Newton.
316
00:22:26,627 --> 00:22:30,147
Here are the opening
pages of modern science...
317
00:22:30,666 --> 00:22:32,827
with its all-embracing
vision of nature...
318
00:22:33,386 --> 00:22:37,307
universal laws of
motion, gravity...
319
00:22:37,467 --> 00:22:42,067
not just for the Earth
but for the cosmos.
320
00:22:42,228 --> 00:22:44,148
Halley raced back to Cambridge.
321
00:22:44,308 --> 00:22:47,188
Mr. Newton, I beseech
you to work all of this
322
00:22:47,348 --> 00:22:49,468
into a book as soon as possible.
323
00:22:49,628 --> 00:22:52,829
I can assure you the
Royal Society will publish it.
324
00:22:52,989 --> 00:22:54,629
But there was
one little problem.
325
00:22:55,509 --> 00:23:00,069
We are in agreement that Mr. Newton
has produced a masterpiece.
326
00:23:00,229 --> 00:23:03,589
However, I'm afraid
the Royal Society has...
327
00:23:03,749 --> 00:23:07,549
Well, regrettably, sales
for the History of Fish...
328
00:23:07,710 --> 00:23:11,110
have not lived up to our
financial expectations.
329
00:23:12,550 --> 00:23:13,831
It's an impressive book.
330
00:23:13,990 --> 00:23:17,830
Extremely comprehensive, really.
331
00:23:17,990 --> 00:23:23,071
It's filled with lavish
illustrations of, well, fish.
332
00:23:24,351 --> 00:23:27,112
The disappointing sales
led to a bigger problem.
333
00:23:27,272 --> 00:23:32,352
The Royal Society pretty much blew its
total annual budget on the History of Fish.
334
00:23:32,512 --> 00:23:34,992
In fact, they were so
strapped for cash...
335
00:23:35,152 --> 00:23:39,753
they had to pay poor Halley's salary
with copies of their worst-selling book.
336
00:23:39,912 --> 00:23:42,633
With no money to print
Newton's Principia...
337
00:23:42,792 --> 00:23:46,393
the scientific revolution
hung in the balance.
338
00:23:50,793 --> 00:23:52,553
Without Halley's
heroic efforts...
339
00:23:52,714 --> 00:23:57,074
the reclusive Newton's masterwork
might never have seen the light of day.
340
00:23:57,234 --> 00:23:58,955
But Halley was a
man on a mission...
341
00:23:59,114 --> 00:24:02,434
absolutely determined to bring
Newton's genius to the world.
342
00:24:03,155 --> 00:24:07,275
That pre-scientific world,
the world ruled by fear...
343
00:24:07,435 --> 00:24:10,475
was poised at the
edge of a revolution.
344
00:24:10,635 --> 00:24:13,356
Everything depended on
whether or not Edmond Halley...
345
00:24:13,515 --> 00:24:16,476
could get Newton's book
out to the wider world.
346
00:24:16,636 --> 00:24:19,196
Halley resolved not only
to edit Newton's book...
347
00:24:19,356 --> 00:24:21,996
but to publish it at
his own expense.
348
00:24:22,156 --> 00:24:24,516
Newton completed
the first two volumes...
349
00:24:24,676 --> 00:24:28,476
laying the mathematical
framework for the physics of motion.
350
00:24:28,636 --> 00:24:32,917
The third volume would settle once and
for all who won the coffeehouse wager.
351
00:24:33,077 --> 00:24:37,078
Newton applied his principles to explain
all the known motions of the Earth...
352
00:24:37,237 --> 00:24:39,597
the moon and the planets.
353
00:24:39,757 --> 00:24:42,638
Unfortunately, there
was this problem.
354
00:24:42,798 --> 00:24:47,118
Now Halley also took on the
role of Newton's psychotherapist.
355
00:24:47,919 --> 00:24:49,839
Isaac, I'm afraid
that Mr. Hooke...
356
00:24:49,998 --> 00:24:53,599
requires an acknowledgment in
the preface of your third volume.
357
00:24:53,759 --> 00:24:56,999
But I have done so, thanking
him, Mr. Wren and yourself...
358
00:24:57,159 --> 00:24:59,919
for prodding me to think
again on astronomical matters.
359
00:25:00,079 --> 00:25:02,359
Mr. Hooke has been
going about London...
360
00:25:02,519 --> 00:25:05,359
saying that you got the
law of gravity from him.
361
00:25:05,520 --> 00:25:07,320
Why, that litigious little...
362
00:25:07,480 --> 00:25:11,921
Never. I would sooner burn the third
volume than deface it with such a lie.
363
00:25:12,080 --> 00:25:13,320
To hell with Hooke.
364
00:25:13,480 --> 00:25:16,880
He will be long forgotten when
your ideas are still being celebrated.
365
00:25:19,321 --> 00:25:22,561
More copies of
that dreadful book?
366
00:25:22,721 --> 00:25:25,161
Wherever shall we put them all?
367
00:25:25,322 --> 00:25:26,921
We talked about
this, Mary, dear.
368
00:25:27,082 --> 00:25:29,162
This is my salary
from the Society.
369
00:25:29,322 --> 00:25:31,842
They have nothing else
with which to pay me.
370
00:25:32,002 --> 00:25:36,082
If only Mr. Hooke and
Mr. Newton were more like you.
371
00:25:36,242 --> 00:25:39,443
Halley and Wren decided to
confront Hooke about his false claims.
372
00:25:40,082 --> 00:25:42,003
That law is mine, I tell you.
373
00:25:42,163 --> 00:25:43,363
I proved it first.
374
00:25:43,523 --> 00:25:45,363
Then fetch your
proof here at once.
375
00:25:45,524 --> 00:25:49,724
Let us see it. Surely we
have waited on it long enough.
376
00:25:50,123 --> 00:25:52,724
You'll simply have
to take my word for it.
377
00:25:52,884 --> 00:25:57,204
Empty claims may persuade
elsewhere, but not here.
378
00:25:57,364 --> 00:25:59,724
Put up or shut up, Mr. Hooke.
379
00:26:00,725 --> 00:26:03,085
Blasted Newton.
I'll make him pay.
380
00:26:19,206 --> 00:26:21,006
If it wasn't for
Edmond Halley...
381
00:26:21,166 --> 00:26:25,967
Newton's great book would've never
been conceived, nor written, nor printed.
382
00:26:26,127 --> 00:26:30,447
Okay, but so what? What
difference does that make to us?
383
00:26:30,607 --> 00:26:32,447
What's the big deal?
384
00:26:38,808 --> 00:26:44,408
When Isaac Newton was born in this house
in 1642, the world was very different.
385
00:26:44,568 --> 00:26:46,570
Everyone looked at
the perfection of the
386
00:26:46,581 --> 00:26:48,889
clockwork motions of
the planets in the sky...
387
00:26:49,048 --> 00:26:52,689
and could only understand it as
the work of a master clockmaker.
388
00:26:52,849 --> 00:26:54,289
How else to explain it?
389
00:26:54,449 --> 00:26:58,169
There was only one way such a thing
could come about in their imagination.
390
00:26:58,330 --> 00:27:01,289
Only one answer for them: God.
391
00:27:01,450 --> 00:27:06,210
For reasons beyond our understanding,
God just created the solar system that way.
392
00:27:06,370 --> 00:27:09,370
But this explanation
is the closing of a door.
393
00:27:09,530 --> 00:27:12,250
It doesn't lead to
other questions.
394
00:27:22,011 --> 00:27:26,812
Along came Newton, a
God-loving man who's also a genius.
395
00:27:26,972 --> 00:27:31,092
He could write the laws of nature
in perfect mathematical sentences.
396
00:27:31,252 --> 00:27:37,973
Formulas that applied universally to
apples, moons, planets and so much more.
397
00:27:40,612 --> 00:27:42,973
With one foot still
in the Middle Ages...
398
00:27:43,133 --> 00:27:46,173
Isaac Newton imagined
the whole solar system.
399
00:27:46,334 --> 00:27:49,441
Newton's laws of gravity
and motion revealed
400
00:27:49,453 --> 00:27:52,294
how the sun held
distant worlds captive.
401
00:27:52,454 --> 00:27:55,454
His laws swept away the
need for a master clockmaker...
402
00:27:55,614 --> 00:27:59,215
to explain the precision and
beauty of the solar system.
403
00:27:59,375 --> 00:28:01,815
Gravity is the clockmaker.
404
00:28:02,574 --> 00:28:05,215
Matter obeyed commandments
we could discover...
405
00:28:05,375 --> 00:28:07,735
laws the Bible hadn't mentioned.
406
00:28:07,896 --> 00:28:11,056
Newton's answer to why the
solar system is the way it is...
407
00:28:11,215 --> 00:28:13,856
opened the way to an
infinite number of questions.
408
00:28:14,375 --> 00:28:17,856
Principia also happened to
include the invention of calculus...
409
00:28:18,016 --> 00:28:23,097
and the first sound theoretical basis
for an end to our imprisonment on Earth:
410
00:28:23,257 --> 00:28:24,816
space travel.
411
00:28:28,417 --> 00:28:32,217
Newton envisioned the
firing of a Cannonball...
412
00:28:32,377 --> 00:28:36,138
with increasingly
greater explosive thrust.
413
00:28:37,858 --> 00:28:40,258
He reasoned that
with enough velocity...
414
00:28:40,418 --> 00:28:43,018
the bounds of gravity
could be broken...
415
00:28:43,178 --> 00:28:47,059
and the cannonball could
escape to orbit the Earth.
416
00:28:47,219 --> 00:28:49,979
This changed everything.
417
00:29:49,384 --> 00:29:53,544
Newton's Principia Mathematica
set us free in another way.
418
00:29:53,704 --> 00:29:57,944
By finding the natural laws governing
the comings and goings of comets...
419
00:29:58,105 --> 00:30:00,425
he decoupled the
motions of the heavens...
420
00:30:00,585 --> 00:30:04,905
from their ancient
connections to our fears.
421
00:30:09,705 --> 00:30:13,066
If Halley hadn't been standing
next to Newton for all those years...
422
00:30:13,226 --> 00:30:15,106
perhaps the world
would remember him...
423
00:30:15,266 --> 00:30:17,866
for his own host of
accomplishments and discoveries.
424
00:30:18,026 --> 00:30:22,066
But the only thing that comes to
mind for most people is the comet.
425
00:30:22,226 --> 00:30:25,066
The irony is that
discovering a comet...
426
00:30:25,227 --> 00:30:28,907
is actually one of the few
things that Halley never did.
427
00:30:33,747 --> 00:30:35,627
Mountain of ice to starboard.
428
00:30:35,787 --> 00:30:38,028
Come about. Come about!
429
00:30:38,188 --> 00:30:40,588
Aye, aye, Captain Halley!
430
00:30:40,748 --> 00:30:42,828
After the publication
of the Principia...
431
00:30:43,308 --> 00:30:46,748
Halley was commanded by his
king to lead three ocean voyages...
432
00:30:47,229 --> 00:30:51,469
scientific expeditions to solve
navigational problems for the British navy.
433
00:30:51,629 --> 00:30:56,909
Halley used this opportunity to make the
first map of the Earth's magnetic field.
434
00:31:00,670 --> 00:31:03,310
And he was also a businessman.
435
00:31:05,830 --> 00:31:08,751
Halley perfected
the diving bell...
436
00:31:09,871 --> 00:31:14,191
and used his invention to start a
flourishing commercial salvage operation.
437
00:31:18,631 --> 00:31:20,872
Hmm. Our Dr. Halley's
gone and done it this time.
438
00:31:21,031 --> 00:31:23,792
I reckon he's been down
there at least three hours.
439
00:31:23,952 --> 00:31:30,512
Not one to risk the lives of others,
Halley personally tested his own invention.
440
00:31:33,672 --> 00:31:36,713
I make it exactly four
hours since our descent.
441
00:31:36,873 --> 00:31:38,593
Not at all bad for 10 fathoms.
442
00:31:43,754 --> 00:31:46,794
He invented the weather map.
443
00:31:48,234 --> 00:31:53,474
And the symbols he devised for indicating
prevailing winds are still in use today.
444
00:32:04,196 --> 00:32:07,955
Halley laid the groundwork for
the science of population statistics.
445
00:32:08,115 --> 00:32:09,076
How?
446
00:32:09,236 --> 00:32:14,756
He compared the birth, marriage, death and
population densities of London and Paris.
447
00:32:14,917 --> 00:32:18,116
He actually had to pace off the
entire perimeter of Paris on foot...
448
00:32:18,276 --> 00:32:20,077
to learn its true dimensions.
449
00:32:20,237 --> 00:32:23,277
He came to the conclusion that
since roughly half of all adults...
450
00:32:23,436 --> 00:32:26,597
fail to reproduce children, who
themselves survive to reproduce...
451
00:32:27,277 --> 00:32:30,273
every married couple
must have four children
452
00:32:30,285 --> 00:32:32,757
in order to maintain
the population.
453
00:32:35,038 --> 00:32:38,758
And it was Edmond Halley who gave
us the actual scale of the solar system.
454
00:32:38,919 --> 00:32:42,398
He figured out a clever way to find
the distance from Earth to the sun.
455
00:32:42,558 --> 00:32:45,807
It involved precisely
measuring the time it took
456
00:32:45,819 --> 00:32:48,879
for the planet Venus
to cross the sun's disc.
457
00:32:51,159 --> 00:32:53,359
Twenty-seven years
after Halley's death...
458
00:32:53,519 --> 00:32:56,320
Captain James Cook made
his first voyage to Tahiti...
459
00:32:56,479 --> 00:32:59,160
for the express purpose
of testing Halley's method...
460
00:32:59,320 --> 00:33:02,000
during a transit of
Venus across the sun.
461
00:33:02,160 --> 00:33:04,281
Using a special filter
to protect his vision...
462
00:33:04,440 --> 00:33:06,960
from being destroyed by
looking directly at the sun...
463
00:33:07,121 --> 00:33:09,481
Cook and his men made
it possible for us to know...
464
00:33:09,641 --> 00:33:13,801
that the sun is 93
million miles from Earth.
465
00:33:14,481 --> 00:33:17,210
And Halley was the
first to realize that the
466
00:33:17,221 --> 00:33:19,961
so-called fixed stars
were not fixed at all.
467
00:33:20,602 --> 00:33:21,721
How'd he do it'?
468
00:33:21,882 --> 00:33:23,361
He pored over
the observations...
469
00:33:23,522 --> 00:33:26,682
made by the ancient Greek
astronomers of the brightest stars.
470
00:33:26,842 --> 00:33:28,522
And he compared
their observations...
471
00:33:28,683 --> 00:33:33,242
with the ones he himself made
of the same stars 1800 years later.
472
00:33:33,403 --> 00:33:35,803
Why hadn't anyone
noticed this before?
473
00:33:35,963 --> 00:33:38,483
Halley figured out that it
would only become apparent...
474
00:33:38,643 --> 00:33:41,724
if you waited long enough
between observations.
475
00:33:41,883 --> 00:33:45,004
It's hard to perceive the motions
of things that are far away.
476
00:33:45,164 --> 00:33:47,396
And the stars are so
very far away that you
477
00:33:47,408 --> 00:33:49,804
would need to track
them for many centuries...
478
00:33:49,965 --> 00:33:53,485
before you could detect
that they moved at all.
479
00:33:55,044 --> 00:33:58,965
Halley discovered the first
clue to a magnificent reality:
480
00:33:59,125 --> 00:34:02,405
All the stars are in motion,
streaming past each other...
481
00:34:02,566 --> 00:34:05,085
rising and falling like
merry-go-round horses...
482
00:34:05,245 --> 00:34:09,846
in their Newtonian dance
around the center of our galaxy.
483
00:34:10,806 --> 00:34:14,846
And, oh, yes, there was
that thing about the comet.
484
00:34:19,287 --> 00:34:21,887
What were those strange
and beautiful celestial visitors...
485
00:34:22,047 --> 00:34:24,607
that appeared without
warning from time to time?
486
00:34:24,767 --> 00:34:27,808
Halley set out to solve this
mystery as a detective would...
487
00:34:27,967 --> 00:34:30,447
by gathering all credible
eyewitness testimony.
488
00:34:30,607 --> 00:34:34,208
The earliest precise observations
of a comet that Halley could find...
489
00:34:34,368 --> 00:34:37,809
were made in Constantinople
by Nicephorus Gregoras...
490
00:34:37,969 --> 00:34:42,009
a Byzantine astronomer
and monk, in June 1337.
491
00:34:42,169 --> 00:34:45,809
Halley hunted down every
astronomical observation of a comet...
492
00:34:45,969 --> 00:34:51,410
recorded in Europe
between 1472 and 1698.
493
00:34:51,569 --> 00:34:55,490
And remember, there was no such
thing as a search engine or a computer.
494
00:34:55,650 --> 00:34:59,010
All Halley had were
his books and his mind.
495
00:34:59,170 --> 00:35:00,451
Now here comes the hard part:
496
00:35:00,610 --> 00:35:03,571
Halley had to take the
observations made for each comet...
497
00:35:03,731 --> 00:35:07,011
and find the shape of its
actual path through space.
498
00:35:07,171 --> 00:35:09,171
No one else but Newton
had yet attempted...
499
00:35:09,331 --> 00:35:12,411
to apply his new set of laws
to an astronomical question.
500
00:35:12,571 --> 00:35:15,772
In an arduous tour de force
of mathematical brilliance...
501
00:35:15,932 --> 00:35:22,212
Halley discovered that comets were
bound to the sun in long elliptical orbits.
502
00:35:26,132 --> 00:35:30,132
And he was the first to know
that the comets seen in 1531
503
00:35:31,173 --> 00:35:35,813
1607, and 1682...
504
00:35:35,974 --> 00:35:37,533
were one and the same.
505
00:35:37,693 --> 00:35:40,774
A single comet that
returned every 76 years.
506
00:35:40,933 --> 00:35:44,294
In a stunning example of
true pattern recognition...
507
00:35:44,454 --> 00:35:48,414
he predicted it would be seen
again more than 50 years in the future.
508
00:35:50,694 --> 00:35:53,655
For millennia, comets had
been props for mystics...
509
00:35:53,815 --> 00:35:57,775
who considered them to be
merely omens of human events.
510
00:35:57,935 --> 00:36:02,095
Halley shattered their monopoly,
beating them at their own game.
511
00:36:02,255 --> 00:36:05,576
A game that no scientist
had ever played before:
512
00:36:05,736 --> 00:36:07,736
prophecy.
513
00:36:07,896 --> 00:36:09,576
And he did not hedge his bet.
514
00:36:09,736 --> 00:36:13,257
Like Babe Ruth predicting where his
next home run would land in the stands...
515
00:36:13,417 --> 00:36:18,297
Halley stated flatly that the comet
would return at the end of 1758...
516
00:36:18,457 --> 00:36:23,298
from a particular part of the
sky, following a specific path.
517
00:36:23,457 --> 00:36:25,857
There is hardly a prophecy
attempted by the mystics...
518
00:36:26,018 --> 00:36:29,938
that ever even strives
for comparable precision.
519
00:36:49,740 --> 00:36:51,780
That's Halley's Cornet.
520
00:36:51,940 --> 00:36:54,940
Out here at the edge of the solar
system, it doesn't look like much.
521
00:36:55,100 --> 00:36:58,180
Just a big hunk of
ice and rock in space.
522
00:36:58,340 --> 00:37:02,741
That's because beyond the orbit of Neptune,
nearly 5 billion kilometers from the sun...
523
00:37:02,901 --> 00:37:04,900
comets lead very quiet lives.
524
00:37:07,621 --> 00:37:09,662
As it reaches the
far end of its orbit...
525
00:37:09,821 --> 00:37:13,261
it'll slow down till the sun
allows it to go no farther.
526
00:37:13,421 --> 00:37:18,062
Then it'll begin its long fall
back to the inner solar system.
527
00:37:18,422 --> 00:37:21,422
Halley's Comet is in
free fall around the sun.
528
00:37:21,582 --> 00:37:23,062
Everything in
our solar system...
529
00:37:23,223 --> 00:37:26,542
the Earth, the moon, the other
planets, comets, asteroids...
530
00:37:26,702 --> 00:37:29,583
all of them are
falling around the sun.
531
00:37:29,743 --> 00:37:34,303
Gravity pulls the planets towards the sun,
but because of their orbital momentum...
532
00:37:34,463 --> 00:37:39,144
they keep moving around
the sun, never falling into it.
533
00:37:42,624 --> 00:37:46,864
"Robert Hooke had died years before, having
ruined his health with some bad habits."
534
00:37:47,024 --> 00:37:50,905
daily doses of Wormwood,
opium, mercury.
535
00:37:51,065 --> 00:37:53,337
A few months later,
Newton was elected to
536
00:37:53,349 --> 00:37:55,905
replace him as president
of the Royal Society.
537
00:37:56,065 --> 00:38:01,346
It is said that a portrait of
Hooke once hung on these walls.
538
00:38:01,506 --> 00:38:05,386
Halley lived on to accomplish
many more astonishing feats.
539
00:38:05,546 --> 00:38:09,587
He worked right up
to his death at age 85.
540
00:38:10,226 --> 00:38:13,746
His final act was to
call for a glass of wine.
541
00:38:13,906 --> 00:38:18,027
He downed it with pleasure
and breathed his last breath.
542
00:38:22,867 --> 00:38:26,548
Some believe that it
was on a night like this...
543
00:38:26,708 --> 00:38:31,188
that Isaac Newton finally took
his revenge against Robert Hooke.
544
00:38:38,828 --> 00:38:39,829
Heh.
545
00:38:45,469 --> 00:38:47,990
But Halley's prophecy
was not forgotten.
546
00:38:48,149 --> 00:38:51,670
Fifty years later, as the time of
the predicted return approached...
547
00:38:51,830 --> 00:38:56,110
the world's astronomers vied to be
the first to catch sight of his comet.
548
00:38:56,270 --> 00:38:57,991
They weren't disappointed.
549
00:38:58,151 --> 00:39:01,750
It's been welcomed
back every 76 years since.
550
00:39:02,710 --> 00:39:05,089
When Halley's Comet
returns to our skies,
551
00:39:05,101 --> 00:39:07,831
sunlight will warm up
the ice on its surface...
552
00:39:07,991 --> 00:39:13,951
once again setting loose the
dust and gases trapped within.
553
00:39:15,432 --> 00:39:20,512
Halley's Comet most recently
visited our neighborhood back in 1986.
554
00:39:20,672 --> 00:39:26,633
And if you're seeing this in
2061, then you'll know it's back.
555
00:39:27,993 --> 00:39:32,113
May you feel the wonder of all
those who came before you...
556
00:39:32,273 --> 00:39:34,033
and none of the fear.
557
00:39:34,874 --> 00:39:37,354
Newton's laws made it
possible for Edmond Halley...
558
00:39:37,514 --> 00:39:43,034
to see some 50 years into the future
and predict the behavior of a single comet.
559
00:39:43,674 --> 00:39:46,675
Scientists have been using
these laws ever since...
560
00:39:46,835 --> 00:39:51,355
opening the way to the moon,
and even beyond our solar system.
561
00:39:51,514 --> 00:39:55,675
The baby in the basket
is learning to walk...
562
00:40:00,475 --> 00:40:03,276
and to know the cosmos.
563
00:40:07,356 --> 00:40:10,316
Which brings me
to one last prophecy.
564
00:40:10,476 --> 00:40:13,476
Using nothing more than
Newton's laws of gravitation...
565
00:40:13,637 --> 00:40:17,957
we astronomers can confidently predict
that several billion years from now...
566
00:40:18,117 --> 00:40:20,637
our home galaxy,
the Milky Way...
567
00:40:20,797 --> 00:40:25,318
will merge with our
neighboring galaxy Andromeda.
568
00:40:25,918 --> 00:40:30,238
Because the distances between the stars
are so great compared to their sizes...
569
00:40:30,398 --> 00:40:34,559
few if any stars in either
galaxy will actually collide.
570
00:40:34,718 --> 00:40:38,438
Any life on the worlds of that
far-off future should be safe...
571
00:40:38,599 --> 00:40:43,519
but they would be treated to an
amazing, billion-year-long light show...
572
00:40:44,759 --> 00:40:48,680
a dance of a half
a trillion stars...
573
00:40:49,040 --> 00:40:52,320
to music first heard
on one little world...
574
00:40:52,480 --> 00:40:56,400
by a man who had
but one true friend.
51718
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