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The only way energy can escape is by radiation.
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This is so inefficient that white dwarfs will take trillions of years to cool down, which may make them humanity's last refuge.
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They might be the last sources of light and energy in a dying universe.
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According to some estimates, white dwarfs might shine as long as 100 billion billion years, 10 billion times longer than the universe has existed.
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Galaxies will have evaporated.
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And only then will the first white dwarf turn into the first black dwarf.
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When this happens, the last hope for life will die off.
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Black dwarfs will be inactive spheres with no energy left to give.
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So cold that they'll be near the coldest possible temperature in the universe.
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So dark that they are practically invisible.
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The universe will enter its last stage, heat death, which will leave the universe unrecognizable.
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We don't know for sure what will happen with black dwarfs in the end.
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If the proton, one of the fundamental parts of atoms, has a limited lifespan, black dwarfs will slowly evaporate over many trillions of years.
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If the proton does not decay, black dwarfs will probably turn into spheres of pure iron via quantum tunneling over a timespan so obscenely gigantic that calling it forever is okay.
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These iron spheres will then travel completely alone through a dark universe.
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Nothing new will happen anymore.
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While this may sound kind of dark, this is so far away that for our purposes today, it might as well not happen at all.
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It doesn't matter what happens in a billion trillion years.
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Right now, we happen to exist at an excellent time.
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Our music is finally available on Spotify and iTunes.
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It's composed by our good friends at Epic Mountain, two guys with a studio who make music for a living.
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You can check them out here and follow them on Facebook and Twitter.
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And if you like our videos, please consider supporting us on Patreon.
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It really would be extremely helpful.
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If you need an excuse to delay work a little bit longer, here's a playlist with more space videos.
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One day the last star will die and the universe will turn dark forever.
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It will probably be a red dwarf, a tiny kind of star that's also one of our best bets to find alien life and might be the last home of humanity before the universe becomes uninhabitable.
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So what do we know about them and why are they our last hope?
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At least 70% of stars in the universe are red dwarfs.
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They are the tiniest stars out there with only about 7-50% of the mass of our sun, not that much bigger than our planet Jupiter, which is still huge though.
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They are also very dim.
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It's impossible to see them with the naked eye.
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You've never seen one in the night sky.
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Even with all our technology we can only clearly observe red dwarfs in our neighborhood.
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Approximately 20 of the 30 stars close to Earth are red dwarfs.
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Like all stars, red dwarfs fuse hydrogen into helium.
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But while more massive stars accumulate all the fused helium in their cores, red dwarfs stay convective, meaning that the helium and hydrogen constantly mix.
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So they use up their fuel incredibly slowly before they're extinguished.
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Red dwarfs burn so slowly that their average lifespan is between 1 and 10 trillion years.
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By comparison, the sun will survive for another 5 billion years.
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Because the universe is only 13.75 billion years old, not a single red dwarf has reached later development stages.
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Every single one of the trillions that exist is still a baby.
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Speaking of babies, the smallest star in the entire universe is also a red dwarf because small red dwarfs are right on the verge of being a star at all.
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Just a tiny bit less hydrogen and they are mere brown dwarfs.
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Since our sun will die one day, we'll eventually need to look for a new home.
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And where there are habitable planets, there might also be aliens.
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The Kepler Space Observatory found that at least half of all red dwarfs host rock planets between half and four times the mass of our Earth.
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Many of them are in the habitable zone, the area around a star where water can be liquid.
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But since red dwarfs burn at relatively cold temperatures, a planet would need to be really close to be hospitable.
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For example, a planet this close to a star would probably be tidally locked, meaning the same side would always face it.
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This side would be incredibly hot, while the shadow side would be frozen, which makes it hard for life to develop.
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Although a planet with a big enough ocean might be able to distribute the star's energy and create some kind of stability.
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All the gravitational forces of the red dwarf could squeeze the planet and heat it up so much that it might lose all its water over time.
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These planets could end up like Venus, a hot, burning hell.
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Another problem is that many red dwarfs vary in their energy output.
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They can be covered in star spots that can dim their emitted light by up to 40% for months, which would cause oceans on planets to freeze over.
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At other times, they can emit powerful solar flares, sudden outbursts of energy incredibly powerful.
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These red dwarfs could double their brightness in minutes, which could strip away sizable portions of a planet's atmosphere and burn it, rendering it sterile.
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On the other hand, their extremely long lifespan is a big plus.
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A red dwarf with just moderate levels of activity could be an amazing place for a planet that hosts life.
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Life on Earth has existed for about 4 billion years, and we have about a billion years left before the sun becomes so hot that complex life on Earth will become impossible.
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We will either die out or leave Earth and look for a new home.
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We could build a civilization for potentially trillions of years around a red dwarf with the right conditions.
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About 5% of the red dwarfs in the Milky Way may host habitable, roughly Earth-sized planets.
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That would be more than 4 billion in total.
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But life may not even need a planet like Earth.
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Candidates for life around a red dwarf may be the moons of gas giants, also called super-Earths, really massive, rocky planets.
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All in all, there are an estimated 60 billion potentially habitable planets around red dwarfs, and that's in the Milky Way alone.
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So red dwarfs might become really important for our survival in the future.
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But everything has to die at some point, even red dwarfs.
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When in trillions of years the life of the last red dwarf in the universe is about to end, it will not be a very spectacular event.
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As its hydrogen runs out, it shrinks, becoming a blue dwarf burning out completely.
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After its fuel is spent, it's transformed into a white dwarf, an object about as small as Earth, packed very densely and made of degenerate gases, mostly of helium-4 nuclei.
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Having no more source of energy, it will cool extremely slowly over trillions of years until it becomes its final form, a cold black dwarf.
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White and black dwarfs are so fascinating that they deserve their own video.
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Anyway, it's going to be a long time before the last stars in the universe vanish.
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It's kind of uplifting to know that if humanity succeeds in venturing into space, we have plenty of time before the universe turns out the lights.
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Our videos are made thanks to your support on Patreon.com.
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If you want to help us make more of them, we really appreciate your support.
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The universe today is happy and healthy, with exciting things going on.
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But at some point, the night will turn dark.
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Everything that once was will peacefully sleep forever.
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But what is the last thing that will ever happen, and when will it be?
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It turns out there is such a thing, and you probably haven't heard about it.
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Let's travel to the end of the universe and look at the last thing.
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After a messy birth, our universe was a sleepy baby, warm and dark, filled with swirling clouds of hot hydrogen and helium.
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The story of creation is a story of this gas and where it will end up.
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Shortly after, the universe got busy making the first generation of stars.
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They were massive and lived violent lives, forging new elements, only to release most of them when they blew up.
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Countless stars were born and refined the gas available in the universe, cycling matter around, each generation giving most of its gas and fresh elements to the next.
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But not all gas is returned.
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Every time a new generation of stars forms, they also make more and more red dwarfs that burn slowly and live for trillions of years.
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When they die, they don't give their gas back to the universe, but turn it into white dwarfs.
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So red dwarfs lock up more gas forever.
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More gas is locked forever in other remains of dead stars, neutron stars and black holes, which is bad as it reduces the material available for new stars.
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Today, the universe is a great home for us and will remain so for billions of years.
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But most of the gas has been used up or trapped.
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Over 90% of the stars that will ever be born have been born already.
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To get to the last thing to ever happen, all other things need to happen first.
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The next few hundred billion years will be fun and a great time for galactic exploration.
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