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Things around us
aren't always what they seem.
4
00:01:55,699 --> 00:01:59,911
In the everyday world,
we use a simple scale, ourselves...
5
00:02:00,078 --> 00:02:04,123
...to know what's small and what's large.
6
00:02:13,634 --> 00:02:17,220
But what about the worlds
that lie beyond?
7
00:02:18,639 --> 00:02:23,184
What is truly large and truly small?
8
00:02:30,567 --> 00:02:34,153
To explore, to observe...
9
00:02:34,321 --> 00:02:38,699
...to understand the wider world
we call the universe:
10
00:02:38,867 --> 00:02:42,453
This is one of the great
human adventures.
11
00:02:56,844 --> 00:03:02,098
As we look out at the distant horizon,
we may ask ourselves...
12
00:03:02,266 --> 00:03:05,935
...what is our true place in the universe?
13
00:03:09,064 --> 00:03:11,357
We are all travelers...
14
00:03:11,525 --> 00:03:15,152
...on an unending voyage of discovery.
15
00:03:54,526 --> 00:03:58,487
More than 25 centuries ago,
among the Greek islands...
16
00:03:58,655 --> 00:04:02,950
...here at the vibrant crossroads of Africa,
Asia and Europe...
17
00:04:03,118 --> 00:04:05,828
...philosophers began to devise
rational theories...
18
00:04:05,996 --> 00:04:07,997
...about the world around them.
19
00:04:11,376 --> 00:04:14,503
The wondrous waves and forms
of nature, they said...
20
00:04:14,671 --> 00:04:16,672
...could be understood.
21
00:04:46,870 --> 00:04:48,996
One Greek thinker suggested
that the Earth...
22
00:04:49,164 --> 00:04:52,124
...actually moved around the sun.
23
00:04:55,087 --> 00:04:59,507
Another taught that everything,
the work of man and nature...
24
00:04:59,675 --> 00:05:03,886
...was made of particles too small to see.
25
00:05:07,933 --> 00:05:10,851
Others estimated the sizes
of the Earth and the moon...
26
00:05:11,019 --> 00:05:12,895
...and the distances between them...
27
00:05:13,063 --> 00:05:16,649
...and reasoned that both were spheres.
28
00:05:18,902 --> 00:05:23,072
But it would be many centuries before
we had the tools to extend our vision...
29
00:05:23,281 --> 00:05:27,243
...and confirm the wisdom
of these early thinkers.
30
00:05:28,245 --> 00:05:29,870
In the meantime...
31
00:05:30,038 --> 00:05:35,042
...people around the world
gazed on the stars and gave them names.
32
00:05:35,210 --> 00:05:41,340
Most assumed that the Earth
was the center of an unchanging universe.
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00:06:14,374 --> 00:06:16,125
Two thousand years passed...
34
00:06:16,293 --> 00:06:20,004
...before a revolutionary breakthrough
was made by a mathematics professor...
35
00:06:20,172 --> 00:06:24,216
...in the ancient,
maritime republic of Venice.
36
00:06:24,593 --> 00:06:28,095
In 1609, Galileo Galilei...
37
00:06:28,305 --> 00:06:32,808
...demonstrated an instrument
that would soon be called the telescope.
38
00:06:36,480 --> 00:06:38,272
From the tallest bell towers...
39
00:06:38,440 --> 00:06:40,983
...he showed the device
could spot approaching ships...
40
00:06:41,151 --> 00:06:45,029
...hours before their sails were visible
to the naked eye.
41
00:06:46,198 --> 00:06:49,575
Later, when he aimed his telescope
at the night sky...
42
00:06:49,743 --> 00:06:53,662
...Galileo discovered that the moon
was a world with mountains...
43
00:06:53,830 --> 00:06:55,790
...Jupiter had its own moons...
44
00:06:55,957 --> 00:07:00,211
...and the Milky Way
was a band of countless stars.
45
00:07:04,508 --> 00:07:07,426
Our own cosmic voyage begins here...
46
00:07:07,594 --> 00:07:11,847
...in the center of Galileo's Venice,
St. Mark's Square.
47
00:07:17,270 --> 00:07:21,398
Since the universe is a big place,
we could easily get lost...
48
00:07:21,566 --> 00:07:26,028
...so we'll need signposts
to give us a sense of scale.
49
00:07:28,115 --> 00:07:32,201
The acrobats' ring is 1 meter wide.
50
00:07:34,454 --> 00:07:38,332
The crowd is 10 times wider,
10 meters across.
51
00:07:38,500 --> 00:07:41,460
Larger by one power of 10.
52
00:07:45,048 --> 00:07:48,592
Now, with every step, every ring...
53
00:07:48,760 --> 00:07:51,804
...we travel 10 times farther
from Venice...
54
00:07:51,972 --> 00:07:56,308
...and our view of the universe
is 10 times wider.
55
00:07:58,562 --> 00:08:01,647
The 100-meter ring
surrounds St. Mark's...
56
00:08:01,815 --> 00:08:06,777
...and 1000 meters, 1 kilometer,
the city's center.
57
00:08:07,946 --> 00:08:12,408
As our speed increases,
four steps, four powers of 10...
58
00:08:12,576 --> 00:08:15,744
...reveal all the islands of Venice,
the Adriatic Sea...
59
00:08:15,912 --> 00:08:18,831
...and the mainland of Northern Italy.
60
00:08:25,046 --> 00:08:26,755
Six steps take in Europe...
61
00:08:26,923 --> 00:08:30,843
...from central Germany
across Italy to the Balkans.
62
00:08:33,847 --> 00:08:37,308
And soon, we can see the entire planet.
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00:08:37,475 --> 00:08:40,102
Our home in space.
64
00:08:51,072 --> 00:08:53,282
Eight steps on our outward journey...
65
00:08:53,450 --> 00:08:58,787
...eight powers of 10, and we pass
the farthest reaches of human travel:
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00:08:58,955 --> 00:09:00,706
The moon.
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00:09:25,941 --> 00:09:29,318
If we visualize the paths
that the nine planets take...
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00:09:29,486 --> 00:09:32,279
...in their orbits around the sun...
69
00:09:32,906 --> 00:09:36,116
...at 13 steps from St. Mark's Square...
70
00:09:36,284 --> 00:09:40,079
...the entire solar system
comes into view.
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00:09:49,005 --> 00:09:53,509
And with 15 steps, 15 powers of 10...
72
00:09:53,677 --> 00:09:57,346
...we can see that our sun
is just another star.
73
00:09:57,847 --> 00:10:02,017
From here on, our voyage
will be measured in light-years...
74
00:10:02,185 --> 00:10:06,105
...the distance light travels
in an entire year.
75
00:10:07,732 --> 00:10:11,986
Only now do we fly past
our nearest neighbor stars...
76
00:10:12,153 --> 00:10:15,698
...almost five light-years away.
77
00:10:16,324 --> 00:10:19,618
The same journey at the speed
of today's spacecraft...
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00:10:19,786 --> 00:10:23,831
...would last 100,000 years.
79
00:10:30,422 --> 00:10:32,589
As we cross the perpetual night...
80
00:10:32,757 --> 00:10:36,093
...our voyage takes us up and out
of our sun's neighborhood...
81
00:10:36,261 --> 00:10:40,139
...near the edge
of a great pinwheel of stars.
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00:11:02,037 --> 00:11:05,039
The Milky Way is actually
a spiral galaxy...
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00:11:05,206 --> 00:11:10,586
...and our own sun is just one
of a hundred billion stars in it.
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00:11:10,962 --> 00:11:14,840
At this immense scale,
23 powers of 10...
85
00:11:15,008 --> 00:11:18,093
...each shining light we see
is not a star...
86
00:11:18,261 --> 00:11:23,349
...but an entire galaxy
composed of countless stars.
87
00:11:24,017 --> 00:11:25,517
Astronomers have discovered...
88
00:11:25,685 --> 00:11:28,854
...that galaxies are flying away
from one another.
89
00:11:29,022 --> 00:11:32,775
The universe is expanding.
90
00:11:33,693 --> 00:11:36,320
Our own galaxy, and all the others...
91
00:11:36,488 --> 00:11:39,990
...form clusters and superclusters
of stupendous size...
92
00:11:40,200 --> 00:11:43,619
...hundreds of millions
of light-years across.
93
00:11:46,623 --> 00:11:51,168
And here, about 15 billion light-years
from Venice...
94
00:11:51,336 --> 00:11:55,297
...we approach the outer limits
of the visible universe.
95
00:11:55,507 --> 00:12:01,095
What lies beyond this cosmic horizon,
we cannot see...
96
00:12:01,471 --> 00:12:03,639
...and do not know.
97
00:12:19,322 --> 00:12:23,283
While Galileo's telescope
allowed us to take an outward voyage...
98
00:12:23,451 --> 00:12:26,829
...another innovation,
here in the Dutch town of Delft...
99
00:12:26,996 --> 00:12:31,166
...would lead us on an inward journey
of discovery.
100
00:12:40,885 --> 00:12:42,678
Over three centuries ago...
101
00:12:42,846 --> 00:12:46,515
...Anton van Leeuwenhoek
perfected the early microscope...
102
00:12:46,683 --> 00:12:50,686
...and used it to study droplets
from the waterways of Holland.
103
00:13:14,169 --> 00:13:17,212
As students today
make their own discoveries...
104
00:13:17,380 --> 00:13:21,467
...imagine when Van Leeuwenhoek peered
through his more powerful instrument...
105
00:13:21,634 --> 00:13:26,972
...and discovered a living kingdom
in a drop of water.
106
00:13:34,189 --> 00:13:37,232
This busy world of single-cell paramecia...
107
00:13:37,400 --> 00:13:40,068
...is only 1 millimeter across.
108
00:13:40,236 --> 00:13:43,989
Three powers of 10 smaller than a meter.
109
00:13:47,702 --> 00:13:50,370
The microscope allows us
to continue our journey...
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00:13:50,538 --> 00:13:53,540
...into the realm of the very small.
111
00:13:53,708 --> 00:13:56,293
As we move into the cell nucleus...
112
00:13:56,461 --> 00:13:58,921
...each new ring now reveals a world...
113
00:13:59,088 --> 00:14:04,092
...ten times smaller in diameter
than the last.
114
00:14:06,095 --> 00:14:08,347
Deep within the nucleus...
115
00:14:08,515 --> 00:14:11,934
...we come upon
truly remarkable constructions.
116
00:14:12,101 --> 00:14:16,271
Long, spiraling molecules of DNA.
117
00:14:18,358 --> 00:14:20,400
DNA holds the chemical codes...
118
00:14:20,568 --> 00:14:23,987
...for the reproduction of most organisms
on the planet...
119
00:14:24,155 --> 00:14:29,409
...whether they're paramecia,
people or petunias.
120
00:14:35,625 --> 00:14:38,001
Voyaging on, we see that molecules...
121
00:14:38,169 --> 00:14:42,464
...are made of even smaller parts
called atoms.
122
00:14:47,303 --> 00:14:51,473
The tiny world of the carbon atom
is very strange indeed.
123
00:14:51,641 --> 00:14:56,144
Its six electrons seem to swarm
everywhere at once.
124
00:14:58,898 --> 00:15:01,191
Now our voyage takes us
through a void...
125
00:15:01,359 --> 00:15:05,862
...that appears as vast as the space
between the stars.
126
00:15:06,030 --> 00:15:08,824
Ahead lies the atomic nucleus...
127
00:15:08,992 --> 00:15:11,201
...so fantastically small...
128
00:15:11,369 --> 00:15:14,454
...that if the whole atom
were the size of this theater...
129
00:15:14,622 --> 00:15:18,625
...its nucleus would be
like a speck of dust.
130
00:15:19,002 --> 00:15:23,046
Yet the nucleus contains
almost all of the atom's mass...
131
00:15:23,214 --> 00:15:27,968
...packed into particles called protons
and neutrons.
132
00:15:29,053 --> 00:15:35,517
And these, in turn, are made of still smaller,
mysterious things called quarks.
133
00:15:37,895 --> 00:15:39,354
Exploring this...
134
00:15:39,522 --> 00:15:41,607
...the inner frontier of the universe...
135
00:15:41,774 --> 00:15:44,318
...physicists wonder
if quarks might contain...
136
00:15:44,485 --> 00:15:47,696
...even tinier building blocks of matter.
137
00:15:54,412 --> 00:15:59,875
Scientists are investigating this mystery
in an underground tunnel near Chicago...
138
00:16:00,043 --> 00:16:03,337
...home of the giant
Fermilab particle accelerator...
139
00:16:03,921 --> 00:16:07,215
...designed to create conditions
like those that existed...
140
00:16:07,383 --> 00:16:10,594
...just after the birth of our universe.
141
00:16:13,348 --> 00:16:15,891
Millions of protons and antiprotons...
142
00:16:16,059 --> 00:16:18,685
...race through these pipes
in opposite directions...
143
00:16:18,853 --> 00:16:24,483
...nearly at the speed of light
in a kind of subatomic demolition derby.
144
00:16:52,387 --> 00:16:57,015
Now our cosmic voyage
enters another dimension...
145
00:16:57,600 --> 00:16:59,434
...the dimension of time...
146
00:16:59,977 --> 00:17:02,938
...where knowledge is much less certain.
147
00:17:03,106 --> 00:17:06,358
Studying traces of quarks
from these collisions...
148
00:17:06,526 --> 00:17:10,278
...physicists try to learn
what our universe was like when it began...
149
00:17:10,446 --> 00:17:14,491
...after the explosion
known as the big bang.
150
00:17:16,619 --> 00:17:19,204
One of them outlines the theory:
151
00:17:19,622 --> 00:17:21,123
Welcome to Fermilab.
152
00:17:21,457 --> 00:17:24,167
Today, astronomers
see the universe expanding.
153
00:17:24,335 --> 00:17:26,795
Imagine running the expansion
backwards.
154
00:17:26,963 --> 00:17:28,338
Billions of years ago...
155
00:17:28,506 --> 00:17:31,717
...everything must've been packed together
at enormous density.
156
00:17:31,884 --> 00:17:34,636
It seems incredible,
but we think that the matter...
157
00:17:34,804 --> 00:17:38,640
...making up everything we see
in the universe today, everything...
158
00:17:38,808 --> 00:17:42,811
...the buildings, trees, people, planets...
159
00:17:42,979 --> 00:17:46,022
...stars out to the most distant galaxies...
160
00:17:46,190 --> 00:17:49,901
...was once crammed together
into a volume smaller than this.
161
00:17:51,154 --> 00:17:52,821
And then....
162
00:18:08,463 --> 00:18:13,133
Space itself exploded,
in a burst of radiant energy.
163
00:18:14,510 --> 00:18:16,887
In those first dazzling moments...
164
00:18:17,054 --> 00:18:21,892
...the newborn universe
began to expand and cool.
165
00:18:22,435 --> 00:18:25,604
Quarks combined
into protons and neutrons...
166
00:18:25,772 --> 00:18:29,858
...which later attracted electrons
to form atoms...
167
00:18:30,026 --> 00:18:33,653
...and the vast fog lifted.
168
00:18:47,293 --> 00:18:49,169
For hundreds of millions of years...
169
00:18:49,337 --> 00:18:54,049
...the force of gravities slowly drew matter
together into a gigantic web.
170
00:18:54,217 --> 00:18:57,385
The architecture of the cosmos.
171
00:19:03,059 --> 00:19:05,852
Two billion years passed.
172
00:19:06,020 --> 00:19:09,815
Clouds of gas and dust condensed
like giant water drops...
173
00:19:09,982 --> 00:19:14,528
...along the cosmic strands
and formed galaxies.
174
00:19:26,207 --> 00:19:28,458
Where the great ridges of matter
crossed...
175
00:19:28,626 --> 00:19:31,795
...galaxies came together in clusters.
176
00:19:56,362 --> 00:19:59,489
Some galaxies evolved
into gigantic disks...
177
00:19:59,657 --> 00:20:03,660
...and spirals of stars, gas, and dust.
178
00:20:04,203 --> 00:20:07,455
Neighboring galaxies trapped
by their mutual gravity...
179
00:20:07,623 --> 00:20:11,585
...draw together in the fantastic collision.
180
00:20:11,752 --> 00:20:15,964
In real time, it would last a billion years.
181
00:20:53,586 --> 00:20:57,172
The force of gravities
stretch long tails of gas and stars...
182
00:20:57,340 --> 00:21:00,050
...from the huge new galaxy.
183
00:21:02,303 --> 00:21:05,305
And yet stars almost never collide...
184
00:21:05,473 --> 00:21:08,516
...so vast are the distances
between them.
185
00:21:18,319 --> 00:21:21,029
Perhaps 10 billion years pass...
186
00:21:21,197 --> 00:21:23,365
...and we encounter our own galaxy:
187
00:21:23,532 --> 00:21:25,450
The Milky Way.
188
00:21:25,910 --> 00:21:28,995
In it, stars have formed...
189
00:21:29,163 --> 00:21:31,206
...and some have died.
190
00:21:35,920 --> 00:21:38,505
Stars are nuclear furnaces.
191
00:21:38,714 --> 00:21:41,424
They shine until they use up their fuel.
192
00:21:41,592 --> 00:21:45,345
Massive stars end explosively.
193
00:21:58,901 --> 00:22:02,570
These exploding stars, or supernovas...
194
00:22:02,738 --> 00:22:04,990
...send out the elements of life:
195
00:22:05,157 --> 00:22:08,535
The oxygen we breathe,
the carbon in our muscles...
196
00:22:08,703 --> 00:22:10,787
...the iron in our blood.
197
00:22:11,789 --> 00:22:15,166
Now a cloud of cosmic gas
sprinkled with these elements...
198
00:22:15,334 --> 00:22:18,253
...comes together in the grip of gravity.
199
00:22:23,592 --> 00:22:27,637
A new star, our sun, ignites.
200
00:22:29,932 --> 00:22:32,600
Around it, planets form.
201
00:22:34,770 --> 00:22:38,773
In their infancy,
over four billion years ago...
202
00:22:38,941 --> 00:22:41,443
...our Earth and moon
were bombarded constantly...
203
00:22:41,610 --> 00:22:45,405
...by cosmic dust, asteroids...
204
00:22:45,573 --> 00:22:47,574
...and comets.
205
00:23:42,505 --> 00:23:47,050
With violent impacts, volcanic gases,
acid rain...
206
00:23:47,218 --> 00:23:50,678
...and potent ultraviolet radiation
from the sun...
207
00:23:50,846 --> 00:23:54,682
...the young Earth
was a very hostile world.
208
00:23:57,019 --> 00:24:01,356
And yet the basic ingredients of life
are already here.
209
00:24:08,155 --> 00:24:09,823
Water...
210
00:24:09,990 --> 00:24:11,449
...carbon...
211
00:24:12,034 --> 00:24:13,660
...and energy.
212
00:24:16,789 --> 00:24:21,126
Molecules, sheltered by the sea,
somehow combined...
213
00:24:21,293 --> 00:24:24,420
...multiplied and gave rise to life.
214
00:24:24,588 --> 00:24:29,759
For millions of years,
Earth's only organisms were tiny bacteria.
215
00:24:29,927 --> 00:24:33,221
Some, called blue-green bacteria...
216
00:24:33,389 --> 00:24:37,058
...slowly released
tiny bubbles of oxygen...
217
00:24:37,226 --> 00:24:41,563
...and profoundly changed
the atmosphere.
218
00:24:42,898 --> 00:24:48,069
Above the clouds, some of this oxygen
formed a thin layer of ozone...
219
00:24:48,279 --> 00:24:52,073
...blocking most of the sun's
ultraviolet rays.
220
00:24:57,121 --> 00:24:59,664
In this changed environment...
221
00:24:59,832 --> 00:25:03,001
...new organisms flourished
in the Earth's waters.
222
00:25:04,295 --> 00:25:08,548
Colonies of green algae
produced more oxygen.
223
00:25:16,182 --> 00:25:20,602
Then organisms evolved
in an astonishing variety of forms.
224
00:25:21,937 --> 00:25:26,524
Some with shells or skeletons
for protection and support.
225
00:25:36,202 --> 00:25:41,748
Others evolved complex life cycles,
like this tiny crustacean.
226
00:25:42,625 --> 00:25:48,963
The shallow waters of the seas
filled with a teaming diversity of life forms.
227
00:26:00,851 --> 00:26:06,606
Life's next challenge
was to colonize the harsh, dry land.
228
00:26:09,109 --> 00:26:15,156
Bacteria were first, followed by algae,
plants and animals.
229
00:26:39,515 --> 00:26:44,936
Vertebrates appeared on land,
feeding on both plants and animals...
230
00:26:45,729 --> 00:26:50,316
...and gave rise to larger
and larger life forms.
231
00:26:53,028 --> 00:26:55,863
Some of them conquered
the realm of the air...
232
00:26:56,782 --> 00:27:00,743
...and others, the great open plains.
233
00:27:20,347 --> 00:27:24,183
Our cosmic voyage, from the big bang
to the appearance of humans...
234
00:27:24,351 --> 00:27:28,146
...took about 15 billion years.
235
00:27:29,148 --> 00:27:32,233
From the beginning, we were explorers...
236
00:27:32,401 --> 00:27:35,778
...inventors and technicians.
237
00:27:43,954 --> 00:27:48,583
And in a few thousand years,
just an instant in cosmic time...
238
00:27:48,751 --> 00:27:54,589
...curiosity and technology
would take us back toward the stars.
239
00:28:23,869 --> 00:28:26,037
Since it was launched into orbit...
240
00:28:26,205 --> 00:28:28,831
...the Hubble Space Telescope
has captured images...
241
00:28:28,999 --> 00:28:31,125
...that reveal ever more beautiful...
242
00:28:31,293 --> 00:28:36,589
...and mysterious regions of the universe,
where stars are dying out.
243
00:28:39,968 --> 00:28:41,886
And within the Eagle Nebula...
244
00:28:42,054 --> 00:28:47,183
...strange towers of glowing gas
are giving birth to new stars.
245
00:28:48,644 --> 00:28:50,561
In the great Orion Nebula...
246
00:28:50,729 --> 00:28:55,858
...disks of dust seem to be turning
into solar systems just like our own.
247
00:28:59,822 --> 00:29:04,158
The grand adventure of cosmic exploration
is accelerating rapidly...
248
00:29:04,326 --> 00:29:08,329
...taking us into realms
that once were the stuff of science fiction...
249
00:29:08,497 --> 00:29:12,333
...like the mysterious black hole.
250
00:29:16,922 --> 00:29:21,134
Here, a red giant star
is slowly being consumed...
251
00:29:21,301 --> 00:29:25,680
...its gases swirling into the depths
of a black hole.
252
00:29:29,685 --> 00:29:34,230
Some black holes may be collapsed cores
of very massive stars...
253
00:29:34,398 --> 00:29:38,943
...with gravity so powerful
not even light can escape them.
254
00:29:39,111 --> 00:29:44,407
But they can be detected when they attract
and swallow nearby stars.
255
00:29:53,459 --> 00:29:55,543
For the first time in our history...
256
00:29:55,711 --> 00:30:01,382
...we now have strong evidence
that there are planets orbiting other stars.
257
00:30:02,009 --> 00:30:07,138
Scientists think there could be millions
of Earth-like planets in our galaxy alone.
258
00:30:10,726 --> 00:30:14,896
If so, do any of them have life?
259
00:30:18,650 --> 00:30:20,818
Some radio telescopes
search for signals...
260
00:30:20,986 --> 00:30:24,906
...that may reveal the presence
of alien civilizations.
261
00:30:25,866 --> 00:30:27,950
It's a daunting task.
262
00:30:28,118 --> 00:30:31,579
But if one day we should
receive a signal...
263
00:30:31,747 --> 00:30:35,249
...it would forever change our view
of ourselves...
264
00:30:35,417 --> 00:30:37,585
...and our universe.
265
00:31:02,361 --> 00:31:06,364
Telescopes, such as the giant
Keck Observatory in Hawaii...
266
00:31:06,532 --> 00:31:09,659
...are like time machines
capturing the faint light...
267
00:31:09,826 --> 00:31:13,704
...that has traveled towards us
through all of cosmic history.
268
00:31:14,122 --> 00:31:19,919
The deeper astronomers look into space,
the farther back they see in time.
269
00:31:35,477 --> 00:31:38,145
The more we learn about the universe...
270
00:31:38,313 --> 00:31:41,065
...the more new mysteries we uncover...
271
00:31:41,233 --> 00:31:47,154
...profound questions for future generations
of cosmic explorers.
272
00:31:50,033 --> 00:31:54,078
Will the universe go on
expanding forever?
273
00:31:54,246 --> 00:31:57,456
Exactly how did life arise?
274
00:31:57,624 --> 00:32:01,794
Could there be other universes
beyond our cosmic horizon?
275
00:32:01,962 --> 00:32:04,964
And are there others
elsewhere in the universe...
276
00:32:05,132 --> 00:32:07,675
...asking the same things?
277
00:32:07,843 --> 00:32:11,846
Even to ask such questions is ambitious.
278
00:32:12,014 --> 00:32:15,308
But look how far we've traveled
since our ancestors...
279
00:32:15,475 --> 00:32:19,353
...took the first steps
in our cosmic voyage.
280
00:36:03,286 --> 00:36:05,287
[ENGLISH]
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