What If: Science, Theory, and Possibilities
An epic exploration of possibilities. What If is a Webby Award-winning science web series that takes you on a journey through hypothetical worlds and possibilities, some in distant corners of the universe, others right here on Earth. Each scenario examines a scientific theory, research or fact through a hypothetical question.
Episodes
What If You Died on Every Kepler Planet?
NASA's Kepler Space Telescope has discovered 2,784 distant alien worlds. While some orbit within habitable zones and look like Earth, they are far from safe. Join us as we explore the lethal conditions of six specific Kepler planets.
Ever wondered what would actually happen? Explore our biggest What If scenarios and go deeper with the What If community.
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What If the Strait of Hormuz Never Reopens?
Higher gas prices? That's just the beginning. What happens if it never reopens?
Ever wondered what would actually happen? Explore our biggest What If scenarios and go deeper with the What If community.
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Exploring the Largest Objects in the Universe
Today, we explore the colossal scale of the largest objects in our observable Universe. It's all about size, not mass. While black holes and neutron stars are incredibly dense, they don't make the cut on our list of massive objects.
Join us as we delve into the vastness of space and discover just how 'huge' things can get.
Timeline:
00:00 True Scale of the Largest Objects in the Universe01:34 Jup
Exploring Survival on TRAPPIST Planets
39 light-years from Earth lies the TRAPPIST-1 star, illuminating seven Earth-sized exoplanets. These planets, packed tightly, are fascinatingly close to their star, with three potentially habitable.
Join explorer Chase as he rates these celestial bodies, exploring which are most suitable for life and which are perilously deadly. Discover the unimaginable βWhat Ifβ scenarios within the TRAPPIST sys
What If America Made a Base on the Moon?
NASA is planning to return to the moon, but this time, it's not just a visit. Welcome to Space Race 2.0, where the goal has shifted from planting flags to establishing permanent infrastructure and control.
Ever wondered what would actually happen? Explore our biggest What If scenarios and go deeper with the What If community.
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What If Earth Collided With Every Planet?
Every planet in the solar system is hurtling toward Earth for an epic collision. In this special planetary battle royale, we use Space Sim to simulate six increasingly destructive cosmic crashes to see the physics behind the destruction. From being swallowed by gas giants to the formation of a brand-new magma world, we explore if anything, or anyone, could possibly survive.
Have a collision idea?
What If the U.S. Actually Invaded Iran?
What would happen if the United States invaded Iran? While many might assume it would be similar to the war in Iraq, the reality of the geography and military strategy suggests a much different outcome.
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What If You Grew 1cm Every Second
One second, you're your regular size, the next, you're towering over a skyscraper. And some 40 years later? You're the size of a planet. Yeah, you've been growing. ASTRONOMICALLY. Soon, you'll become a human bridge between Earth and the Moon. That is, if you don't collapse into a black hole. Today, we've got you growing 1 cm every second.
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Nothing in This Universe Is the Right Size
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From the first spark of life to the extinction of the dinosaurs, explore prehistoric Earth in one marathon watch. π¦ Experience billions of years of evolution, giant creatures, and moments that shaped life as we know it.
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What If the Earth Stopped Spinning for 5 Seconds?
Hang on because weβre about to screech to a halt. Thatβs right, the Earth is going to stop spinning for five seconds. How much damage would this sudden stoppage cause? What would you experience in different parts of the world? And when the Earth starts spinning again, would it still be habitable? How would the day and night cycle be affected? Why would there be strong winds?
Ever wondered what wou
What If Saturn Replaced Our Moon?
Imagine looking up to see a gas giant 33 times wider than the Moon dominating the sky with its massive rings stretching across the horizon. But this stunning view comes with a heavy price.
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What If You Watched a Sunset on Every Planet?
You see, there are 2 trillion galaxies out there in the Universe. Within them, there are trillions of stars. The Universe is a strange place, and the view is about to get spectacular. So buckle up. We are traveling from Mercury to the edge of the known Universe, to witness the most beautiful, and deadly, alien sunsets you've ever seen.
Ever wondered what would actually happen? Explore our biggest
Digging to the Earth's Core: Challenges and Discoveries
There's a problem with the Earth's core. It's right under our feet, yet we've never actually seen it. Today, we explore solutions for drilling to the Earth's center. What would happen if you fell through the planet? Let's find out.
Discover the history of the Kola Superdeep Borehole and the challenges it faced. Understand the massive scale of drilling to the core and the effects of the Coriolis fo
What If Humanity Became Fully Optimized?
What would happen if humanity reached its absolute peak? No disease, no inefficiency, no wasted potentialβjust a fully optimized species operating at maximum intelligence, strength, and coordination. Sounds perfectβ¦ right?
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What If Prehistoric Earth Never Changed?
What If is a mini-documentary web series that takes you on an epic journey through hypothetical worlds and possibilities. Join us on an imaginary adventure through time, space and chance while we (hopefully) boil down complex subjects in a fun and entertaining way.
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What If You Ate Dry Ice?
What would happen if you actually ate dry ice? It looks like regular ice, but it's anything but harmless.
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What If Jupiter Collided With Earth?
The biggest planet in the Solar System has gone rogue. Now, itβs heading straight toward Earth with only 30 days until this gas giant wipes us out. Discover the speeds at which Jupiter might travel and the havoc it could cause along the way. Could we survive being consumed by this planetary giant? What would happen to the Asteroid belt?
Ever wondered what would actually happen? Explore our biggest
What If the Largest Asteroid Hit Earth?
Some seriously large asteroids have threatened Earth before. Some of these asteroids have little chance of hitting us but there are a few with very real chances of making contact. What happens if a large asteroid or comet hits Earth? And what are the chances something like Oumuamua or Bennu could actually hit our planet?
Ever wondered what would actually happen? Explore our biggest What If scenari
Pluto: Astonishing Discoveries
Explore the remarkable facts about Pluto in this intriguing episode. What if you traveled to this distant world, or if Earth was as small as Pluto? Dive into these fascinating scenarios and more.
Enjoying this episode? Dive even deeper into the world of science and discovery with Popular Science, the free streaming channel bringing you more of what you love, plus epic explorations in engineering,
What If a Tiny Black Hole Appeared in New York City?
What if a black hole the size of a coin suddenly appeared in the middle of New York City? Would it instantly swallow everything or would something far stranger happen?
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Scientists Discovered Jupiterβs Secrets
What secrets is the giant of our solar system hiding? π
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MORE FROM UNDERKNOWN
Aperture β Philosophy & PsychologyHow to Survive
What Will Humans Evolve To?
What will humans look like in the future? From stronger bodies to bigger brains, or maybe even merging with machines. Human evolution is far from over. But itβs not just natural selection shaping our future anymore. Technology, environment, and even space travel could completely redefine what it means to be human.
Ever wondered what would actually happen? Explore our biggest What If scenarios and
What If You Fell Into the Biggest Void in the Universe?
The BoΓΆtes Void is one of the most mysterious places in space, spanning hundreds of millions of light-years and containing almost nothing. It is often called the "Great Nothing."
What would it be like to travel there? Would you see complete darkness? Could you survive the journey through such an unimaginably empty region? What does this reveal about the universe's structure?
Explore our biggest Wh
What If It Rained Oil?
Black Rain is falling on Tehran and it doesn't stop there. Oily, toxic, and flammable. Roads turn to ice rinks, planes fall from the sky, your tap runs brown, and crops die in the ground. One lightning strike could ignite the world.
Scientists already have a name for what comes after Black Rain. Drop it in the comments if you know.
Ever wondered what would actually happen? Explore our biggest What
What If You Explored Every Kepler Planet?
Some planets might look promising from a distance, but stepping onto them could turn them into the most dangerous places in the universe. In this episode, we explore the extreme worlds discovered by the Kepler Space Telescope and imagine what would happen if a human explorer tried to survive on them. From crushing gravity and toxic atmospheres to molten lava oceans and massive gas giants, these al
What If You Dove Into the Sun?
Youβre traveling through our Solar System when suddenly, you have the opportunity to reach out and touch our biggest and brightest celestial body.
Touching our Sun would require a heat-resistant spacesuit, the strongest sunscreen, sunglasses, and a lot of courage.
The risks of touching the Sun are high. You could be instantly obliterated if you touched the Sun. Could you take the heat?
Ever wonder
What If You Were the Last Person on Earth?
So you wake up one day and find that you're the only person left in the world. Kind of cool, right? No obligations, no rules, no limits.
Actually, go for the exotic fruits first. If your mangos and bananas are imported from overseas, chances are they'll be hard to get to. So eat them while you can, and enjoy every last bite.
Ever wondered what would actually happen? Explore our biggest What If sce
Why Saturn is The Scariest Planet
Enjoy more science and discovery with Popular Science, the free streaming channel offering epic explorations in engineering, rocket launches, movies, space, and Earth sciences. Learn more.
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What If Earth Lost Gravity?
What would happen if Earth suddenly lost gravity? π
Gravity is the invisible force holding everything together, including the oceans, the atmosphere, the Moon, and even you. But imagine if that force suddenly disappeared. What would happen to the air we breathe, the water in the oceans, and the planet itself?
Ever wondered what would actually happen? Explore our biggest What If scenarios and go de
Betelgeuse Replacing Our Sun: What Happens?
You can fit over a million Earths inside our Sun, but Betelgeuse, a massive red supergiant, could engulf over a billion Suns. It's in its final fusion cycles, nearing a violent supernova.
If Betelgeuse replaced our Sun, it would consume half the Solar System before exploding. Survival prospects? Not promising. Explore this scenario and more.
Help support animal welfare in our own backyards by visi
The Most Terrifying Planets in the Universe
From small, eerie rocks to massive, nightmare-inducing worlds, we journey through the most terrifying planets in the universe!
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Why The Megalodon's Extinction Saved Us
For millions of years, the oceans were ruled by a predator so powerful it made todayβs great white sharks look small. Meet the Megalodon, a 60-foot, multi-ton apex predator with a bite force stronger than any creature that has ever lived.
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What If We Dumped Our Trash Into Volcanoes?
A volcano is one of the most unforgiving natural phenomena on Earth. If you were to fall into its magma-filled center, your body would quickly bubble up and disappear without a trace. So if they're so good at getting rid of things, why aren't we using them to dispose of our garbage? Has anyone tried it before? How would we transport all our trash to them? What dangers would be involved?
Ever wonde
Episode 27: Earth's 4.5 Billion Years of Evolution
From a swirling cloud of cosmic dust to a planet teeming with life, Earthβs story is nothing short of unbelievable. We explore 4.5 billion years of planetary evolution, witnessing the birth of our world, the formation of the Moon, the cooling of Earthβs surface, and the emergence of the first oceans.
This content was conducted on behalf of Nevada King Gold Corp. (TSXV: NKG) (OTCQB: NKGFF) and was
What If Earth Was As Big As the Sun?
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Earth's Entire Evolution in 3 Minutes
What if you could watch 4.5 billion years of history unfold in just 3 minutes? From a violent cloud of cosmic dust to a blue planet teeming with life, this is the complete story of Earth, compressed into one epic timeline.
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What If You Lived on Mars 1 Billion Years Ago?
Scientists have potentially discovered life on Mars! To understand this groundbreaking finding and its implications, journey back in time with us, starting from the very beginning.
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What If You Lived on Mars 1 Billion Years Ago?
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Apertu
Traveling to Before the Big Bang
Take the entire known Universe, all 93 billion light-years of it. All two trillion galaxies, every star, every planet, every black hole, every quasar, every speck of dust, and you. Then squeeze it all down until it's smaller than a proton. Now, you've got yourself a singularity.
The kind of singularity that was the beginning of our Universe. And thatβs where youβre headed. The moment before the Bi
What if Planet X Was Actually Real?
Over the past century, astronomers have speculated about the existence of a mysterious 9th planet lurking in the outer reaches of our Solar System.
Although we've never directly observed the elusive Planet X, researchers keep finding more strange phenomena that seem to support its existence. Scientists believe that Planet X, also referred to as Planet 9, is about 17 times bigger than Earth, and ma
What If Earth was Flat But Gravity Still Existed?
What if Earth was flat... but gravity still existed? In this mind-bending science experiment, we explore what would really happen if our planet were shaped like a giant disc, while gravity kept pulling everything βdown.β
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What if You Traveled to Earth 2.0?
Discovered by NASAβs Kepler Space Telescope, Kepler-452b is one of the most Earth-like exoplanets ever found. It orbits in the habitable zone of a Sun-like star, about 1,400 light-years away, the region where temperatures could allow liquid water to exist.
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What Happens When You Drop a Black Hole into a Pool of Water?
A calm pool of water. A single splash. And suddenly, one of the most dangerous objects in the universe is sitting inches from your feet. Black holes destroy galaxies. Water fills swimming pools. So what happens when you put them together?
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If Saturn Replaced Our Moon
A huge gas giant suddenly appears in the sky. You look up in wonder. It's beautiful. And terrifying. The second Saturn replaces our Moon in its orbit, Earth would just as suddenly stop being a planet. We would become a moon.
Yeah, scientists would have to reclassify Earth. That is, if any scientist, or any humans at all, could survive this planetary switch. Because Earth days would now be numbered
What If the World Lost Oxygen for Five Seconds?
Imagine if all the Earthβs oxygen disappeared, not forever, just for 5 seconds. Would we just hold our breath? What would happen to the atmosphere and the environment?
Hereβs what would happen if the world lost oxygen for just 5 seconds.
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Discovering Kraken in the Mariana Trench
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What If We Nuked Venus?
Venus is often called Earthβs evil twin, similar in size, but completely hostile to life. With crushing pressure, surface temperatures hot enough to melt lead, and a runaway greenhouse effect gone wild, itβs one of the most extreme worlds in the Solar System. But what would actually happen if we detonated nuclear weapons on Venus?
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What If We Swapped Our Moon With Ganymede?
What would happen if Earthβs Moon suddenly vanished and Jupiterβs giant moon Ganymede took its place? Ganymede is bigger than Mercury, packed with ice and rock, and powerful enough to generate its own magnetic field.
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Episode 2016: What If 2016 Determined Humanityβs Future?
What if one year quietly decided the fate of humanity? 2016 is often remembered for chaos, shock events, and a sense that something changed. But what if that year wasnβt just turbulentβ¦ what if it was a turning point that locked in humanityβs future?
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What Would Your Voice Sound Like on Different Planets?
Explore how your voice would change on different planets, from the deep sounds on gas giants to silence on others. Can anyone hear you scream in space?
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What If You Watched a Sunset on Every Planet?
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Explore the Universe with us as we journey from Mercury to the edge of the known cosmos, witnessing the most beautiful and deadly alien sunsets.
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What If China Invaded Taiwan?
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What If the Largest Objects in the Universe Collided?
In this episode, we're going to smash big things into each other. Why stop at smashing two gargantuan black holes, when you can do the same with the most massive stars, the largest planets, and even two galaxies? It's going to get explosive.
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What If Theia Never Crashed into Earth?
Roughly 4.5 billion years ago, a Mars-sized protoplanet called Theia slammed into early Earth, an event believed to have formed the Moon and shaped life as we know it. But what if that impact never occurred?
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What If You Jumped Into Saturn?
Saturn is famous for its magnificent rings. But did you know other gas planets like Jupiter, Uranus, and Neptune also have rings? Saturn's are just the largest and most visible. Saturn radiates twice as much energy into space than it receives from the Sun. And that means it must have an internal heat source. Do we know what it is? Absolutely not. Well, today we're sending Chase to find out!
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Mating with an Alien
It's a beautiful night. Just you, a bottle of wine, and your partner drifting through the cosmos in a UFO. As you caress their green skin, you know tonight's the night you're mating with an alien. But would your anatomy be compatible? How would conception take place? And what would your child look like?
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What If We Found Alien Life on K2-18b? The Super-Earth Exoplanet!
Imagine discovering life beyond Earth right on a distant exoplanet! In this video, we explore K2-18b, a Super-Earth located 124 light-years away, in the habitable zone of its star. Could this alien world host life? What would it look like? And how would humanity react to such a discovery?
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What If the Sun Became a Red Giant?
The Sun wonβt shine forever in its current form. When it runs out of hydrogen, it will expand into a red giantβfundamentally reshaping the Solar System.
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What If You Fell Into the Biggest Void in the Universe
It's a place where nothing exists. A place without stars, planets, or galaxies. A place where you wouldn't meet a soul for hundreds of millions of light-years. This place is called the BoΓΆtes Void, or as I like to call it, The Great Nothing.
Unless you find your way back to your ship, you'll be drifting through the perplexing dark of this mysterious nothing for billions of years. That is, your fro
What If Quetzalcoatlus Were Still Alive?
A terrifying shadow ripples over the city as a gigantic prehistoric beast soars over the towers, moving faster than the cars on the freeway, hunting. And it's not alone; it hunts in a pack. This was... and IS Quetzalcoatlus. Because today, we're bringing this creature back from extinction. How exactly did Colombian drug lord Pablo Escobar get mixed up in all this? Hold on for that.
What exactly is
A Day Across the Solar System: What Could Go Wrong?
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From the sun going rogue to unstoppable infections and natureβs wildest disastersβtoday we explore every way humanity could meet its end.
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Dying in the Most Terrifying Places in the Universe
Last year, you loved watching me push the limits of science in the most extreme environments imaginable. In the name of discovery and exploration across every planet in our Solar System, the WHAT IF team is backβand this time, weβre raising the stakes even higher.
Get ready for bigger questions, crazier scenarios, and some of the most hostile places in the Universe. Weβre talking supernovas, black
What If You Dug a Hole Through Mars?
What if you started digging and never stopped, until you broke through the other side of Mars? Would you fall forever? Would Marsβ gravity crush you? Or would the planetβs core stop you long before you reached the center?
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What If Earth and Moon Switched Sizes?
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What If We Nuked Kepler-22b?!
Kepler-22b is one of the most famous exoplanets ever discovered, a super-Earth in the habitable zone of its star, 600 light-years away. What would happen if humanity launched a nuclear weapon at this distant world?
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What If Humanity Became a Type 7 Civilization?
Imagine a world where you're not even human. You can create universes with ease and control time. This could be a reality in an incredibly advanced civilization. Is a type 7 civilization even possible? What would humans look like? And why might something like this be a terribly bad idea?
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What If Exoplanets Orbited Our Sun?
What if some of the most fascinating exoplanets were placed into our Solar System? In this episode, we explore the effects of having these distant worlds, like the Earth-like TRAPPIST-1 e, massive super-Earths, frozen rogue worlds, and a super-Saturn with expansive rings, orbiting our Sun.
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Making Proxima Centauri B Habitable
What would it actually take to turn Proxima Centauri b into a livable world? πβ¨
Orbiting the closest star to our Sun, this Earth-sized exoplanet sits in the so-called habitable zoneβbut that doesnβt mean itβs ready for humans. From deadly stellar flares and tidal locking to missing atmospheres and extreme radiation, Proxima b comes with some serious challenges.
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What If Every Asteroid Hit Earth at Once?
Sixty-six million years ago, this asteroid crashed into Earth and wiped out most life, including the dinosaurs. If a similar event happened today, humans would face extinction.
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What If the Sun Became a Black Hole?
What would happen if the Sun suddenly turned into a black hole? Would Earth be instantly swallowed, frozen in darkness, or torn apart by gravity? ππ³οΈ
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What If Quetzalcoatlus Never Went Extinct?
A terrifying shadow casts over the city as a massive prehistoric creature, the Quetzalcoatlus, flies above, faster than the cars below, hunting in packs. Today, we explore what it would be like if this massive pterosaur had never gone extinct. Discover how Colombian drug lord Pablo Escobar is connected to this story.
So, what is Quetzalcoatlus? Contrary to appearances, it is not a dinosaur or a pt
What If You Fell into Saturn?
Saturn is renowned for its magnificent rings, which are the largest and most visible among gas giants, including Jupiter, Uranus, and Neptune. Intriguingly, Saturn emits twice as much energy as it receives from the Sun, suggesting a mysterious internal heat source. Today, we send Chase on a thrilling journey to explore this phenomenon!
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What If Trump Became a Dictator?
What would actually happen if Donald Trump became a dictator? In this video, we explore a hypothetical scenario where democratic norms collapse and absolute power takes over.
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Entire Kardashev Scale Explained
Imagine a future world where you have endless supernatural powers. You can hop throughout the multiverse and bend time to your will. You'd be part of a super-advanced version of humanityβa type 7 civilization. But how do we get here?
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Everything That Could Go Wrong
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What If We Swapped Our Moon with Other Moons?
Catastrophic, planet-wide tides flood cities. Pitch black nights. The ice age more powerful than Earth has ever seen. And tungsten-shaded evening skies. This is what would happen if we swapped our Moon with other moons in the Solar System. Spoiler alert - you are not surviving most of these.
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What If You Travelled 10 Quintillion Years into the Future?
Today, we're going on a journey 10 quintillion years into the future. At this time, our Universe will look and act completely different. Stars will have died out, black holes will form, and Earth will be a distant memory. What else will happen? Will humanity be able to survive this long?
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The Largest Objects in the Universe Colliding
We're exploring the explosive collisions of the universe's largest objects. Why stop at two black holes, when galaxies, massive stars, and planets are also in play?
Key Moments:01:18 Largest Black Holes06:39 Galaxies10:04 Largest Planets13:10 Largest Stars
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What If Antarctica Suddenly Melted?
Underneath Antarctica's ice, there's a deep, dark secret. Today, we're going to melt all that ice to find out how it would transform Earth. What mysteries lie buried deep under its thick frozen surface? As the ice melts and sea levels rise, what would happen to our coastal cities? And why might this lead to some unexpected diseases?
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What If Space Was Hot Instead of Cold?
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