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Okay, so this is why getting to space is hard.
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If you feel all of this seems really complicated, don't worry.
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It's literally rocket science.
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This video was made possible in part by a sponsorship by Airbus Safran Launches and Arianespace, who are getting their new Ariane 6 rocket ready to launch into space in 2020.
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You can learn more about the rocket here.
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And as always, if you like what we do, please consider supporting us on Patreon.com.
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It really helps us out a lot.
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If you're craving more space stuff now, here's a playlist for you.
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Black holes are one of the strangest things in existence.
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They don't seem to make any sense at all.
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Where do they come from?
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And what happens if you fall into one?
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Stars are incredibly massive collections of mostly hydrogen atoms that collapse from enormous gas clouds under their own gravity.
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In their core, nuclear fusion crushes hydrogen atoms into helium, releasing a tremendous amount of energy.
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This energy, in the form of radiation, pushes against gravity, maintaining a delicate balance between the two forces.
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As long as there is fusion in the core, a star remains stable enough.
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But for stars with way more mass than our own sun, the heat and pressure at the core allow them to fuse heavier elements until they reach iron.
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Unlike all the elements that went before, the fusion process that creates iron doesn't generate any energy.
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Iron builds up at the center of the star until it reaches a critical amount, and the balance between radiation and gravity is suddenly broken.
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The core collapses.
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Within a fraction of a second, the star implodes, moving at about a quarter of the speed of light, feeding even more mass into the core.
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It's at this very moment that all the heavier elements in the universe are created as the star dies in a supernova explosion.
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This produces either a neutron star, or if the star is massive enough, the entire mass of the core collapses into a black hole.
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If you looked at a black hole, what you'd really be seeing is the event horizon.
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Anything that crosses the event horizon needs to be traveling faster than the speed of light to escape.
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In other words, it's impossible.
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So we just see a black sphere reflecting nothing.
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But if the event horizon is the black part, what is the whole part of the black hole?
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We're not sure what it is exactly.
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A singularity may be infinitely dense, meaning all its mass is concentrated into a single point in space with no surface or volume, or something completely different.
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Right now, we just don't know.
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It's like a dividing by zero error.
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By the way, black holes do not suck things up like a vacuum cleaner.
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If we were to swap the sun for an equally massive black hole, nothing much would change for Earth, except that we would freeze to death, of course.
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What would happen to you if you fell into a black hole?
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The experience of time is different around black holes.
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From the outside, you seem to slow down as you approach the event horizon, so time passes slower for you.
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At some point, you would appear to freeze in time, slowly turn red, and disappear.
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While from your perspective, you can watch the rest of the universe in fast-forward, kind of like seeing into the future.
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Right now, we don't know what happens next, but we think it could be one of two things.
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A black hole curves space so much, that once you cross the event horizon, there is only one possible direction.
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You can take this literally.
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Inside the event horizon, you can only go in one direction.
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It's like being in a really tight alley that closes behind you after each step.
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The mass of a black hole is so concentrated, at some point, even tiny distances of a few centimeters would mean that gravity acts with millions of times more force on different parts of your body.
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Your cells get torn apart as your body stretches more and more until you're a hot stream of plasma, one atom wide.
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Very soon after you cross the event horizon, you would hit a firewall and be terminated in an instant.
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Neither of these options are particularly pleasant.
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How soon you would die depends on the mass of the black hole.
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A smaller black hole would kill you before you even entered its event horizon, while you probably could travel inside a supermassive black hole for quite a while.
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As a rule of thumb, the further away from the singularity you are, the longer you live.
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Black holes come in different sizes.
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There are stellar mass black holes, with a few times the mass of the sun and the diameter of an asteroid.
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And then there are these supermassive black holes, which are found at the heart of every galaxy and have been feeding for billions of years.
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Currently, the largest supermassive black hole known is S50014+81, 40 billion times the mass of our sun.
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It is 236.7 billion kilometers in diameter, which is 47 times the distance from the sun to Pluto.
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As powerful as black holes are, they will eventually evaporate through a process called Hawking radiation.
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To understand how this works, we have to look at empty space.
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Empty space is not really empty, but filled with virtual particles popping into existence and annihilating each other again.
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When this happens right on the edge of a black hole, one of the virtual particles will be drawn into the black hole and the other will escape and become a real particle.
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So the black hole is losing energy.
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This happens incredibly slowly at first and gets faster as the black hole becomes smaller.
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When it arrives at the mass of a large asteroid, it's radiating at room temperature.
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When it has the mass of a mountain, it radiates with about the heat of our sun,
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and in the last second of its life, the black hole radiates away with the energy of billions of nuclear bombs in a huge explosion.
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But this process is incredibly slow.
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The biggest black holes we know might take up to a googol years to evaporate.
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This is so long that when the last black hole radiates away, nobody will be around to witness it.
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The universe will have become uninhabitable long before then.
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This is not the end of our story.
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There are loads more interesting ideas about black holes.
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We'll explore them in part 2.
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By the way, we've made some Kurzgesagt wallpapers in 4K for different screen sizes.
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You can get them on our Patreon page, which also helps us to make more videos.
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Every two years, one million Japanese disappear.
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China's population will halve by the end of the century.
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The median age in Italy has reached 48.
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All around the world, birth rates are crashing.
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Is humanity dying out?
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What's going on?
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And how bad is it?
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For hundreds of thousands of years, the human population barely grew at all, haunted by disease, famine and war, until the Industrial Revolution.
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Exponential progress led to exponential growth, pushing our numbers to 6 billion in the year 1999, and 8 billion just 24 years later.
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And our numbers will continue to rise for at least another 60 years.
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But this growth obscures something.
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People kind of stopped having babies.
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For a stable population, every couple needs to have two children on average.
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If the number is higher, it grows.
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If lower, it shrinks.
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If it's well below, it shrinks a lot and quickly.
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Its fertility rate lay at 0.8 children per woman in 2022, the lowest in the world.
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This means 100 South Koreans of childbearing age today will have 40 kids, who then will have 16 kids, who then will have 6.
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If nothing changes, then within 100 years, there will be 94% fewer young people and South Korea will see a population implosion.
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We have yet to see if there's a bottom to fertility rates.
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Although looking at the bigger picture and absolute numbers, this population will not shrink that much.
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It simply returns to the level it once was.
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In 1950, there were 20 million South Koreans.
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In 2023, there are 52 million.
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And by 2100, there will be 24 million again.
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But the issue is not that there will be fewer South Koreans.
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