Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated:
1
00:00:01,140 --> 00:00:02,260
The Sun,
2
00:00:02,260 --> 00:00:05,120
smooth and round and peaceful.
3
00:00:05,560 --> 00:00:11,040
Except when it suddenly vomits radiation
and plasma in random directions.
4
00:00:11,540 --> 00:00:15,580
These solar flares and coronal
mass ejections, or CMEs,
5
00:00:15,580 --> 00:00:19,340
can hit Earth and have serious
consequences for humanity.
6
00:00:19,860 --> 00:00:21,540
How exactly do they work?
7
00:00:21,540 --> 00:00:23,140
How bad could they be?
8
00:00:23,140 --> 00:00:25,020
And can we prepare for them?
9
00:00:25,620 --> 00:00:31,500
[Intro music]
10
00:00:33,520 --> 00:00:37,880
While the Sun seems pretty solid,
it's actually like a very hot ocean.
11
00:00:38,120 --> 00:00:44,380
So hot that it rips atoms into electrons and nuclei,
all flowing around each other in a plasma.
12
00:00:44,740 --> 00:00:49,100
This plasma is pushed around and
shaped by the Sun's magnetic field.
13
00:00:49,300 --> 00:00:54,520
Similar to how the Sun's gravitational field reaches
out to the planets and shapes their orbits.
14
00:00:54,800 --> 00:00:57,760
But magnetism is very different from gravity.
15
00:00:58,000 --> 00:01:01,960
Magnetism is one part of a dual force:
Electromagnetism.
16
00:01:02,460 --> 00:01:07,940
Electricity creates magnetic fields,
and magnetic fields create electricity.
17
00:01:08,120 --> 00:01:12,240
On the Sun, the plasma—made of electrically
charged protons and electrons—
18
00:01:12,240 --> 00:01:14,700
creates a magnetic field as they move,
19
00:01:14,700 --> 00:01:17,980
and this magnetic field then
shapes the flow of particles.
20
00:01:18,460 --> 00:01:22,180
They're stuck in a dynamic
feedback loop called a dynamo,
21
00:01:22,180 --> 00:01:24,620
which keeps the sun's
magnetic field alive.
22
00:01:25,240 --> 00:01:28,960
This magnetic field stores
enormous amounts of energy
23
00:01:28,960 --> 00:01:31,120
and leaks out over the Solar System.
24
00:01:31,520 --> 00:01:36,820
It carries with it a constant trickle of solar plasma,
like a light rain, known as the solar wind,
25
00:01:36,820 --> 00:01:38,720
creating a sort of space weather.
26
00:01:39,600 --> 00:01:41,660
But it isn't always calm and smooth.
27
00:01:41,800 --> 00:01:44,900
As the sun's plasma churns
and flows around itself,
28
00:01:44,900 --> 00:01:47,860
its magnetic field gets
all kinked and twisted.
29
00:01:48,080 --> 00:01:52,100
This creates magnetic knots that
build up enormous amounts of energy.
30
00:01:52,500 --> 00:01:56,600
When the magnetic knots break—like a
tangle of springs exploding outwards—
31
00:01:56,600 --> 00:02:00,720
the Sun can vomit plasma and other
awful things into the Solar System.
32
00:02:01,300 --> 00:02:03,920
These solar storms come in many types,
33
00:02:03,920 --> 00:02:07,540
like solar flares; a tidal wave
of high-energy radiation.
34
00:02:08,080 --> 00:02:12,840
They race through the solar system at the speed
of light, sweeping up protons in the solar wind,
35
00:02:12,840 --> 00:02:16,520
accelerating them into a
high-speed solar-proton storm.
36
00:02:17,320 --> 00:02:19,660
Then, there are coronal mass ejections,
37
00:02:19,660 --> 00:02:23,940
which rip millions or billions of tons
of plasma from the Sun's atmosphere,
38
00:02:23,940 --> 00:02:29,120
catapulting it through the solar system at
speeds of up to 9 million km/h.
39
00:02:29,880 --> 00:02:33,300
When these monsters hit us,
nothing happens on Earth.
40
00:02:33,660 --> 00:02:36,420
While even smaller storms
can damage satellites,
41
00:02:36,420 --> 00:02:38,020
affect radio communication,
42
00:02:38,020 --> 00:02:39,740
or be dangerous to astronauts,
43
00:02:39,740 --> 00:02:42,540
for people on the surface,
space weather is harmless.
44
00:02:43,000 --> 00:02:46,660
Earth's atmosphere protects us from
the worst effects of a solar flare
45
00:02:46,660 --> 00:02:49,880
by absorbing the blast of X-rays
high up in the atmosphere,
46
00:02:49,880 --> 00:02:51,920
well before it reaches the surface.
47
00:02:52,440 --> 00:02:57,200
The electrified plasma from a CME is
deflected by the Earth's magnetic field,
48
00:02:57,200 --> 00:03:00,340
diverting the energy storm to
the North and South Poles,
49
00:03:00,340 --> 00:03:02,940
where energetic particles
fall into the atmosphere,
50
00:03:02,940 --> 00:03:07,100
causing the atmosphere to glow
and creating beautiful auroras.
51
00:03:07,860 --> 00:03:11,400
As with any sort of weather—
most of the time, things are fine.
52
00:03:11,920 --> 00:03:14,340
Sometimes, there are hurricanes, though.
53
00:03:14,440 --> 00:03:17,580
Or in the case of the Sun,
solar superstorms.
54
00:03:18,080 --> 00:03:21,320
And we know that they happen
once or twice every century.
55
00:03:21,680 --> 00:03:25,740
If one were to happen today, we
would first detect strong solar flares,
56
00:03:25,740 --> 00:03:28,840
a sort of flash before the much
more dangerous thunder.
57
00:03:29,400 --> 00:03:34,640
The thunder is a CME, consisting of
billions of tons of hot magnetic plasma
58
00:03:34,640 --> 00:03:38,800
that crosses the 150 million kilometers
between the Sun and Earth
59
00:03:38,800 --> 00:03:40,040
in less than a day.
60
00:03:40,740 --> 00:03:46,140
When it arrives, it causes a shockwave that
violently compresses the Earth's magnetic field
61
00:03:46,140 --> 00:03:48,720
and transfers energy into
the magnetosphere.
62
00:03:49,060 --> 00:03:50,519
But it can get worse.
63
00:03:50,840 --> 00:03:54,800
If the magnetic field of the CME is
aligned to Earth's in just the right way,
64
00:03:54,800 --> 00:03:56,800
the two magnetic fields merge.
65
00:03:57,220 --> 00:04:02,220
As the magnetic cloud passes over Earth,
it stretches the Earth's field into a long tail.
66
00:04:02,740 --> 00:04:06,600
Eventually, the energy stored in the
tail becomes too much to contain.
67
00:04:06,840 --> 00:04:10,760
It snaps and explosively releases
its energy towards Earth.
68
00:04:11,120 --> 00:04:14,040
A geomagnetic storm has begun.
69
00:04:14,840 --> 00:04:17,720
A few hundred years ago,
nobody would have cared.
70
00:04:17,940 --> 00:04:22,620
This storm gushing over the Earth is not relevant
for machines made out of meat and bones.
71
00:04:22,900 --> 00:04:26,800
But it's very relevant for machines
made out of metal and wire.
72
00:04:27,300 --> 00:04:28,640
Remember the dynamo?
73
00:04:28,820 --> 00:04:31,480
Magnetism creates electric currents.
74
00:04:31,540 --> 00:04:37,240
Earth in the 21st century is covered in millions
of kilometers of wires, transporting electricity,
75
00:04:37,240 --> 00:04:41,480
and a complex grid of machines, like
transformers, that make this transfer possible.
76
00:04:42,040 --> 00:04:47,360
A CME's energy can induce currents in our power
grid that can either completely shut it down,
77
00:04:47,360 --> 00:04:51,640
or worse, destroy the transformer
stations that keep our grid running.
78
00:04:52,080 --> 00:04:53,800
This has happened already,
79
00:04:53,800 --> 00:04:58,300
like when the Quebec power grid failed
after a strong solar storm in 1989.
80
00:04:58,880 --> 00:05:02,360
But in general, our engineers know
how to deal with these storms,
81
00:05:02,360 --> 00:05:04,580
and so we usually don't even notice.
82
00:05:05,100 --> 00:05:09,580
The last time a solar hurricane
washed over Earth was in 1859:
83
00:05:09,760 --> 00:05:11,140
The Carrington Event,
84
00:05:11,140 --> 00:05:14,580
the largest geomagnetic storms
ever observed on Earth.
85
00:05:15,160 --> 00:05:18,560
Massive auroras occurred
as far south as the Caribbean.
86
00:05:19,140 --> 00:05:22,240
In some places, they were
so bright that people got up,
87
00:05:22,240 --> 00:05:23,840
thinking the Sun was rising.
88
00:05:24,240 --> 00:05:27,440
Luckily, we only had one
sort of modern technology:
89
00:05:27,440 --> 00:05:28,740
telegraph systems.
90
00:05:29,200 --> 00:05:31,080
They failed all over the world,
91
00:05:31,080 --> 00:05:33,880
shocking their operators
and chucking out sparks.
92
00:05:34,400 --> 00:05:36,940
Today, we have a tad more technology,
93
00:05:36,940 --> 00:05:39,140
and our luck may run out soon.
94
00:05:39,420 --> 00:05:42,660
Another bad solar storm is
bound to happen eventually.
95
00:05:43,200 --> 00:05:48,180
A storm as strong as the Carrington Event
missed earth only by a small margin in 2012.
96
00:05:48,780 --> 00:05:53,500
Studies projected that it would've inflicted
serious damage to electronic systems globally,
97
00:05:53,500 --> 00:05:57,540
costing up to $2.6 trillion to the US alone.
98
00:05:57,840 --> 00:06:03,180
The time to replace all the damaged systems
was estimated at between 4 and 10 years.
99
00:06:03,400 --> 00:06:05,660
It's hard to say how bad
it could have been.
100
00:06:05,900 --> 00:06:07,420
Experts disagreed.
101
00:06:07,480 --> 00:06:09,880
Some assumed there would
just be temporary blackouts,
102
00:06:09,880 --> 00:06:12,080
but others worried it
could be much worse.
103
00:06:12,280 --> 00:06:15,840
We won't know for sure until
a big solar hurricane hits us.
104
00:06:16,200 --> 00:06:20,680
The probability of such an event is
estimated to be 12% per decade.
105
00:06:20,840 --> 00:06:25,160
That's about a 50/50 chance of
at least one in the next 50 years.
106
00:06:25,360 --> 00:06:28,300
And, there is more unsettling news.
107
00:06:28,500 --> 00:06:32,500
A 2019 paper found that
even calm stars, like our Sun,
108
00:06:32,500 --> 00:06:35,860
can create superflares
every few thousand years.
109
00:06:36,380 --> 00:06:39,680
Eruptions orders of magnitude
stronger than the strongest storms
110
00:06:39,680 --> 00:06:41,680
we have observed in the Solar System.
111
00:06:42,060 --> 00:06:46,680
If such a storm hits us unprepared, the
consequences could be catastrophic.
112
00:06:47,100 --> 00:06:50,600
It's hard to overstate how much
we depend on electricity.
113
00:06:50,820 --> 00:06:52,580
It's not just the lights at home.
114
00:06:52,580 --> 00:06:54,100
It means no computers,
115
00:06:54,100 --> 00:06:55,400
no communication,
116
00:06:55,400 --> 00:06:56,720
no navigation.
117
00:06:56,860 --> 00:07:01,200
A sustained power outage might lead
to a breakdown of the supply chain,
118
00:07:01,200 --> 00:07:03,020
water supply systems failing
119
00:07:03,020 --> 00:07:05,560
and hospital generators running dry,
120
00:07:05,880 --> 00:07:07,900
supermarkets not being refilled
121
00:07:07,900 --> 00:07:10,000
while food rots in the fields.
122
00:07:10,280 --> 00:07:14,500
The lack of power might make it extremely
hard to reboot our broken power grid,
123
00:07:14,500 --> 00:07:18,920
taking years or decades to
restart our starving civilization.
124
00:07:19,280 --> 00:07:21,280
Okay, time to panic?
125
00:07:21,580 --> 00:07:26,100
As much as daily newspapers might like for
solar storms to send us back to the Stone Age,
126
00:07:26,100 --> 00:07:27,360
they probably won't.
127
00:07:27,640 --> 00:07:30,700
Fortunately, even though solar
storms aren't preventable,
128
00:07:30,700 --> 00:07:33,440
virtually all of their nasty side effects are.
129
00:07:33,880 --> 00:07:39,340
Scientists observing the Sun have a few hours
up to a few days to see a CME coming.
130
00:07:39,620 --> 00:07:42,920
And the engineers working the
systems that keep the world running
131
00:07:42,920 --> 00:07:46,120
are well aware of the risks
posed by solar storms.
132
00:07:46,640 --> 00:07:50,100
Transformers and substations
can be taken offline—
133
00:07:50,100 --> 00:07:52,000
short preventative blackouts—
134
00:07:52,000 --> 00:07:54,420
or in other words, by unplugging stuff.
135
00:07:54,920 --> 00:07:58,300
Engineers can open up extra lines
to dissipate the extra power.
136
00:07:58,420 --> 00:08:03,500
And with investment and upgrades cheap
compared to those other natural disasters require,
137
00:08:03,500 --> 00:08:07,820
we could protect the world's electric grid
against even the nastiest of storms.
138
00:08:08,040 --> 00:08:10,240
But we do need to prepare.
139
00:08:10,500 --> 00:08:13,040
While the risk is manageable, it is real.
140
00:08:13,540 --> 00:08:16,960
For while our Sun bathes us
in warm and pleasant light,
141
00:08:16,960 --> 00:08:19,960
one day, it might send a monster our way
142
00:08:19,960 --> 00:08:21,820
that we better be ready for.
143
00:08:23,360 --> 00:08:26,000
This video was sponsored by...you!
144
00:08:26,480 --> 00:08:30,200
Kurzgesagt videos are only possible
thanks to your direct support.
145
00:08:30,420 --> 00:08:34,600
For example, if you want to stare at our
smooth and round Sun for a little longer,
146
00:08:34,600 --> 00:08:37,080
we've made two minimal
infographic posters:
147
00:08:37,080 --> 00:08:40,580
one about the scale of the Sun, and
one about the age of the universe.
148
00:08:40,700 --> 00:08:42,940
Both should make you
feel sufficiently tiny
149
00:08:42,940 --> 00:08:45,520
and help you appreciate
your existence a bit more.
150
00:08:46,080 --> 00:08:47,700
But wait, there's more!
151
00:08:47,700 --> 00:08:48,960
We have a bunch of new stuff,
152
00:08:48,960 --> 00:08:51,740
from the long-requested
Bacteriophage infographic poster
153
00:08:51,740 --> 00:08:56,840
to a new Optimistic Nihilsm poster that lets
you enjoy some existential dread in style.
154
00:08:57,280 --> 00:09:01,380
Or, join us in our ant obsession and
get the new Ant Explorer notebook,
155
00:09:01,380 --> 00:09:05,500
with beautiful infographics and facts
about ants and gold lettering on the cover.
156
00:09:05,780 --> 00:09:09,920
If you'd rather update your wardrobe,
have a look at our beanies or t-shirts.
157
00:09:09,920 --> 00:09:11,940
Or, you know, all the other stuff.
158
00:09:12,060 --> 00:09:15,000
We put a lot of love and care
into developing our products
159
00:09:15,000 --> 00:09:17,300
and only make stuff we
want to have ourselves.
160
00:09:17,400 --> 00:09:21,100
If you want to support Kurzgesagt, getting
some merch is the best way to do it
161
00:09:21,100 --> 00:09:23,660
while receiving something
beautiful in return.
162
00:09:23,840 --> 00:09:25,520
Thank you for your support!
163
00:09:25,520 --> 00:09:27,200
And thank you for watching.
164
00:09:28,120 --> 00:09:38,260
[Outro music]14424
Can't find what you're looking for?
Get subtitles in any language from opensubtitles.com, and translate them here.