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If each satellite is a square kilometre, we'd need around 30 quadrillion to surround the sun.
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Even if they're built as lightly as possible, we need about 100 quintillion tonnes of material.
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And then we need the energy to actually put the parts together and deliver them to their positions around the sun.
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On top of all that, we need to have a permanent infrastructure set up in space to start building.
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Let's assume for the purposes of this video that our descendants will take care of that and want to create the megastructure.
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We can sort the challenges into three main categories.
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To get the vast amounts of raw materials required for our Dyson Swarm, we'll have to largely disassemble a whole planet.
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Of the planets available, Mercury is the best candidate.
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It's the closest to the sun and very metal-rich.
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Close to the sun also means less moving stuff around.
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And Mercury has no atmosphere and only about a third of the surface gravity of Earth, making it comparatively easy to launch material into space.
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Next, we should consider the design of our swarm.
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Simpler is better.
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Conventional solar panels are far too intricate and short-lived.
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Our satellites need to operate without repairs or intervention for astronomically long times, and they need to be cheap to produce.
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They're most likely going to be enormous mirrors, which refocus sunlight to central collecting stations like in concentrated solar power on Earth.
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To build and launch them efficiently, they must be incredibly light, made of little more than polished metal foil bound to some supports.
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And last, we need the energy to build and launch the swarm itself.
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Taking apart a planet and launching things into space requires an enormous amount of energy.
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we could only launch as much mass as Mount Everest into space.
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To get the energy needed to build a Dyson sphere, it's almost as if you're going to need the power output of a Dyson sphere.
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But that's okay.
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There's plenty of sunlight to be had on Mercury, so let's get to work.
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Humans are expensive to keep alive and are very sensitive to the environment, so we'd want to automate as much as possible.
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Ideally, we'd have a small crew of controllers who oversee an army of autonomous machines doing the actual work.
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There are four major pieces of technology required.
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The solar collectors are going to give us the energy we need to disassemble the planet.
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To start, maybe we deploy something like one square kilometer of them, either as mirrors or as traditional solar panels.
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They'll provide the energy to run our miners, which strip mine the surface of the planet,
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To get them into space, we need a creative and efficient solution.
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Rockets are too expensive and difficult to deorbit and reuse.
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Instead, we'll want to use a sort of railgun.
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Our swarm satellites will be packed tight for launch, unfurling like an enormous origami once in orbit.
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From this point, we can take advantage of exponential growth,
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Each panel provides the energy to build another.
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Those two work together to build the next two.
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Four become eight, eight become sixteen, and so on.
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Within just about 60 doubling times, the Sun would be completely surrounded by solar panels.
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And this can happen quickly.
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If a square kilometer of solar collectors takes a month to build, we could be done in a decade,
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Even collecting 1% of the Sun's energy is an unbelievable change in our species' energy budget.
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We could create the infrastructure to beam basically unlimited amounts of energy around the solar system for all sorts of projects.
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It could be the start of an interstellar civilization.
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Based on physics alone, this is not just possible, but easy.
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It's such a simple process and such a necessary step for any species to expand beyond their home planet
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that many astronomers think there are probably Dyson spheres already out there in the Milky Way.
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We haven't spotted any yet, but they could be there.
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It's far from certain that humanity will ever get to this point.
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Our attention is too often focused on short-term political gains and conflicts that will not matter in the long run.
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But if we survive the challenges we've set ourselves, we could potentially become the first species in the universe to create a structure with the scope of a star.
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If we do it, the only limitation left will be our own imagination.
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We've just hit you with a lot of pretty wild claims and crazy concepts.
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you might want to hear how you can come up with something like that yourself.
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Brilliant is a problem-solving website that helps you learn stuff through fun puzzles that split up a complex problem into bite-sized chunks and build up to an interesting conclusion.
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It helps you understand how science works by actually using it instead of just memorizing a bunch of stuff.
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Brilliant has tons of interesting courses and puzzles on things like quantum computing, astronomy and logic, and even Dyson spheres.
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If you visit brilliant.org/nutshell or click the link in the description, you can sign up for free and learn all kinds of things.
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As a bonus for Kurzgesagt viewers, the first 688 people will also get 20% off their annual membership.
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With Brilliant, you can finish each day a little bit smarter and just maybe you can help to expand the human species into the universe one day.
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We love Dyson spheres so much that we've also made a poster about them.
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It will look pretty on your wall, but also has some information about the concept of a Dyson sphere.
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Health is the most valuable thing we have in life, but we tend to forget that until we lose it.
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We're living longer than ever before, which is great, but an unforeseen consequence of this is that we also spend a larger and larger portion of our lives being sick.
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Getting old currently means spending more time in pain.
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So scientists are trying to shift the attention of the medical community from optimizing life spans to optimizing health spans,
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To do this, we need to attack the root cause of almost all bodily defects, aging itself.
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Unbeknownst to most people, the science of aging has made enormous progress in the last few years, with human trials about to begin in the near future.
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Let's look at three examples of discoveries that might benefit people who are alive right now.
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Your cells have an expiration date.
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Each time one of your cells divides, it copies its chromosomes.
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Because of the way this works, they lose a tiny bit of DNA at the ends.
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This could be catastrophic, so to protect themselves, we have long segments of DNA called telomeres that sort of act like the stiff bits at the end of shoelaces.
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But they shrink with every cell division.
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In some cells, after a number of divisions, the telomeres are gone and the cell becomes a zombie, a senescent cell.
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Senescent cells stay around and don't die.
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The older you get, the more of them there are inside you.
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They harm tissue around them and are linked to many diseases that accompany old age, like diabetes and kidney failure.
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Scientists genetically engineered mice so that they could destroy their senescent cells as they pleased.
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Older mice without senescent cells were more active, their hearts and kidneys worked better, and they were less prone to cancer.
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Overall, they lived up to 30% longer and in better health than average mice.
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Since we can't genetically engineer all of the cells in the human body, we need to find another way to get rid of our senescent cells.
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But how do we kill them without harming healthy cells?
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Most cells in the body commit a programmed cell suicide when they're damaged.
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It turns out that they underproduce a protein that tells them when it's time to die.
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So, in a late 2016 study, mice were given an injection of this protein.
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It killed 80% of all their senescent cells while causing almost no harm to healthy cells.
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The treated mice became generally healthier and even re-grew lost hair.
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As a result, there are a number of new companies looking at treatments involving senescent cells, and the first human trials will start soon.
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Cells are made from hundreds of millions of parts.
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They're the structures, machines, messages, and the catalysts that make reactions happen.
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All these parts constantly need to be destroyed, cleaned up, and rebuilt.
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As we age, this process becomes less effective, and so parts become crumpled, bunched up, or are removed slower.
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Or they are no longer produced in the quantities we need.
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One of these parts is NAD+, a coenzyme that tells our cells to look after themselves.
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At age 50, we only have about half as much in our bodies as we do at age 20.
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Low amounts of it are linked to a whole bunch of diseases, from skin cancer to Alzheimer's, cardiovascular disease, and multiple sclerosis.
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But NAD++ can't enter cells, so we can't get it as a pill.
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But scientists noticed that other, more flexible substances could enter cells, and would then turn into NAD++ in sight.
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In 2016, multiple trials on mice showed that they boosted the multiplication of skin, brain, and muscle stem cells.
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They were rejuvenated, had a higher ability to repair their DNA, and had a slightly increased lifespan.
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