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If we don't act, our adventure in space might end before it's even begun.
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If our days of dreaming about space exploration might be numbered anyway, we better put them to good use.
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One of the things we most like to spend our time on is learning more about our universe.
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And to do that, you can just keep watching.
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Kurzgesagt and Brilliant are collaborating on a six-part video series about our favorite science and space topics.
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Kurzgesagt has worked with Brilliant for a bit, and we love how they teach you science and maths in a practical way.
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And maybe one day, use your knowledge on problems like space junk, or at least your science projects to start with.
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If you'd like even more edutainment, go to brilliant.org slash nutshell and sign up for free.
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The first 688 people to use the link get their annual premium membership at a 20% discount, and also support our collaboration with Brilliant.
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Nuclear technology made a violent entrance onto the world stage.
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Just one year after the world's first ever nuclear test explosion in 1944, two large cities were destroyed by just two single bombs.
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After that, reactor technology slowly evolved as a means of generating electricity, but it's always been intimately connected with nuclear weapons technology.
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It's nearly impossible to develop nuclear weapons without access to reactor technology.
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In fact, the Nuclear Non-Proliferation Treaty serves the purpose of spreading nuclear reactor technology without spreading nuclear weapons with limited success.
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In 40 years, five countries have developed their own weapons with the help of reactor technology.
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The fact of the matter is that it can be very hard to distinguish a covert nuclear weapons program from the peaceful use of nuclear energy.
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In the 1970s, the big nuclear powers were happily selling peaceful technology to smaller countries, which then developed weapons of their own.
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The road to deadly nuclear weapons is always paved with peaceful reactors.
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Spent nuclear fuel is not only radioactive, but also contains extremely poisonous chemical elements like plutonium.
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It loses its harmfulness only slowly over several tens of thousands of years.
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And there is also a process called reprocessing, which means the extraction of plutonium from spent nuclear fuel.
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It can be used for two purposes, to build nuclear weapons or to use it as new fuel.
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But hardly any of it is used as fuel because we don't have the right kind of reactors for that.
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A milligram will kill you, a few kilograms make an atomic bomb, and even an inconspicuous country like Germany literally has tons of the stuff just lying around because reprocessing sounded like a good idea decades ago.
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And where will all the waste go?
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After dumping it into the ocean was forbidden, we've tried to bury it, but we can't find a place where it will definitely stay secure for tens of thousands of years.
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Over 60 years of nuclear power usage, there have been seven major accidents in reactors or facilities dealing with nuclear waste.
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Three of those were mostly contained, but four of them released significant amounts of radioactivity into the environment.
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In 1957, 1987 and 2011, large areas of land in Russia, Ukraine and Japan were rendered unfit for human habitation for decades to come.
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The number of deaths is highly disputed, but probably lies in the thousands.
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These disasters happened with nuclear reactors of very different types in very different countries and several decades apart.
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Looking at the numbers, we may as well ask ourselves, are 10% of the world's energy supply worth a devastating disaster every 30 years?
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Would 30% be worth another Fukushima or Chernobyl somewhere on Earth every 10 years?
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What area would have to be contaminated so we say, no more?
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Where is the line?
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So, should we use nuclear energy?
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The risks may outweigh the benefits, and maybe we should stop looking into this direction and drop this technology for good.
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If you want to hear the other side of the argument, or a short introduction to nuclear energy, click here.
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Planet Earth is the home of every life form known to us in the universe.
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Its age is about a third of the age of the universe, and, admit it, it is a thing of beauty.
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But how did our home come into existence, and what's it made of?
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4.6 billion years ago, Earth was created from the remnants of dead stars that collected in a giant dirty gas cloud.
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The gas cloud became denser in its center and formed an accretion disk.
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Small particles started clumping together and building larger and larger objects until they formed the objects we call planets today.
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This process took 10 to 20 million years and is still not very well understood.
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At about this time, when the solar system was young and chaotic, a giant object about as big as Mars collided with our home.
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The impact was violent, and if the object had been more massive, it might have destroyed Earth.
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Material from Earth was smashed out into orbit and formed the Moon, which is the biggest satellite in relation to its planet in the solar system.
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At this time, Earth was a hot hell, constantly being hit by asteroids, with seas of lava and a toxic atmosphere.
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But something was about to change drastically.
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Earth cooled down.
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Water from the inside of the Earth wandered to the surface and rained down on Earth, only to vaporize again and become clouds.
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Millions of asteroids brought more and more water to our planet.
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All the water on Earth has about this volume compared to Earth.
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Today, the surface of Earth is 71% water and 29% land.
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97.5% is saline water, while only 2.5% is freshwater.
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The freshwater is 69% ice and snow, 30% are groundwaters, and only about 1% make up the remaining groundwaters.
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But even this small part is mostly frozen.
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Only a tiny part of our water is actually lakes and rivers, and an even tinier part is bound in living things.
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So, gradually the Earth cooled down and the surface formed a thin crust,
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but inside the Earth, hot rock continued to swirl about, moving the crust from below and breaking it apart.
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This process is called plate tectonics and is happening right now.
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We'll make a whole video about it in the future.
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For now, let's just say that the crust of Earth consists of separate giant plates that move around.
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As they meet, they crumble and create mighty mountains.
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Or, violently plunge back down deeper into Earth, creating deep trenches.
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That's the way the highest place on Earth was formed, Mount Everest, and the deepest, the Mariana Trench.
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From our perspective, Earth's mountains and trenches are mighty indeed, but when you look at the Earth in cross-section, you can see how tiny they actually are.
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The part we stand on is the crust, which is about 50 km thick, though it can vary between 5 and 70 km.
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By the way, the deepest hole ever drilled by man is 12.262 km deep.
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After the crust comes the mantle.
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It's a silicate rocky shell and about 2,900 km thick.
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The mantle consists of the upper mantle and the lower mantle.
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The upper mantle has different regions too.
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Its upper part, which is viscous and carries the crust, is called the lithosphere.
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After that, there comes the asthenosphere, which consists of less mobile, mostly solid material.
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The lower mantle reaches deep down to the outer core of Earth.
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Earth's outer core is a liquid layer of iron and nickel about 2,266 km thick.
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Temperatures vary from 4,000 °C to 5,700 °C.
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And in the center is the inner core.
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It's mostly solid, a ball made of an iron-nickel alloy, with a radius of about 1,200 km, 70% the size of the Moon and about the temperature of the surface of the Sun.
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It is slowly growing at an estimated rate of about 1 mm per year.
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This small layer of crystallized milk products of former molten mantle is where we live.
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Then there's Earth's magnetic field.
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It's an invisible phenomenon that diverts high-energy particles coming from the Sun and other sources,
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But why is it there?
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Actually, we don't really know a terrible lot about that.
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We know it has something to do with the core of the Earth.
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Inside this metal sphere, large electrical currents flow in complicated patterns.
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They cause a magnetic field that sort of stabilizes itself according to the laws of electrodynamics.
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This entire system is called the dynamo.
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But don't let us fall you into thinking we have it all figured out.
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By volume, dry air consists mostly of nitrogen, oxygen, argon, carbon, a variable amount of water vapor and small amounts of other gases.
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Humans are very dependent on the lowest layer of the atmosphere, the troposphere, where the weather is.
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It's 12 km thick on average.
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Above that is the stratosphere, which is where the ozone layer protects us from the Sun's most aggressive type of light.
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Above that is the mesosphere, the coldest place on Earth, with an average temperature around minus 85 degrees Celsius.
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At about 80 km up, the thermosphere starts.
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The transition to space is a fluent one without clear borders, but humans decided that space starts here.
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At about 100 km, Earth stops and space begins, though the atmosphere extends a bit further.
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