All Episodes
What If: Science, Theory, and Possibilities — 439 episodes
The Largest Stars in the Universe
What If You Lived Through a Galactic Collision with Milkdromeda?
What If You Traveled Five Billion Years Into the Future?
What Happened Immediately After the Dinosaurs Went Extinct?
What If You Fell Into Every Black Hole?
What If You Dig a Hole to Earth's Core?
What If Earth Became a Type III Civilization?
What If the Smallest Planet Turned into the Biggest Planet?!
Landing on Alien Planets
What If a White Hole and Black Hole Collided?
What If You Traveled to Before The Big Bang?
Nuking Every Planet in the Solar System
What If Betelgeuse Replaced Our Sun?
What If the US Took Control of the Vatican
What If the U.S. and Israel Stop Being Allies?
What If You Died on Every Kepler Planet?
What If the Strait of Hormuz Never Reopens?
Exploring the Largest Objects in the Universe
Exploring Survival on TRAPPIST Planets
What If America Made a Base on the Moon?
What If Earth Collided With Every Planet?
What If the U.S. Actually Invaded Iran?
What If You Grew 1cm Every Second
Nothing in This Universe Is the Right Size
What If the Earth Stopped Spinning for 5 Seconds?
What If Saturn Replaced Our Moon?
What If You Watched a Sunset on Every Planet?
Digging to the Earth's Core: Challenges and Discoveries
What If Humanity Became Fully Optimized?
What If Prehistoric Earth Never Changed?
What If You Ate Dry Ice?
What If Jupiter Collided With Earth?
What If the Largest Asteroid Hit Earth?
Pluto: Astonishing Discoveries
What If a Tiny Black Hole Appeared in New York City?
Scientists Discovered Jupiter’s Secrets
What Will Humans Evolve To?
What If You Fell Into the Biggest Void in the Universe?
What If It Rained Oil?
What If You Explored Every Kepler Planet?
What If You Dove Into the Sun?
What If You Were the Last Person on Earth?
Why Saturn is The Scariest Planet
What If Earth Lost Gravity?
Betelgeuse Replacing Our Sun: What Happens?
The Most Terrifying Planets in the Universe
Why The Megalodon's Extinction Saved Us
What If We Dumped Our Trash Into Volcanoes?
Episode 27: Earth's 4.5 Billion Years of Evolution
What If Earth Was As Big As the Sun?
Earth's Entire Evolution in 3 Minutes
What If You Lived on Mars 1 Billion Years Ago?
What If You Lived on Mars 1 Billion Years Ago?
Traveling to Before the Big Bang
What if Planet X Was Actually Real?
What If Earth was Flat But Gravity Still Existed?
What if You Traveled to Earth 2.0?
What Happens When You Drop a Black Hole into a Pool of Water?
If Saturn Replaced Our Moon
What If the World Lost Oxygen for Five Seconds?
Discovering Kraken in the Mariana Trench
What If We Nuked Venus?
What If We Swapped Our Moon With Ganymede?
Episode 2016: What If 2016 Determined Humanity’s Future?
What Would Your Voice Sound Like on Different Planets?
What If You Watched a Sunset on Every Planet?
What If China Invaded Taiwan?
What If the Largest Objects in the Universe Collided?
What If Theia Never Crashed into Earth?
What If You Jumped Into Saturn?
Mating with an Alien
What If We Found Alien Life on K2-18b? The Super-Earth Exoplanet!
What If the Sun Became a Red Giant?
What If You Fell Into the Biggest Void in the Universe
What If Quetzalcoatlus Were Still Alive?
A Day Across the Solar System: What Could Go Wrong?
Dying in the Most Terrifying Places in the Universe
What If You Dug a Hole Through Mars?
What If Earth and Moon Switched Sizes?
What If We Nuked Kepler-22b?!
What If Humanity Became a Type 7 Civilization?
What If Exoplanets Orbited Our Sun?
Making Proxima Centauri B Habitable
What If Every Asteroid Hit Earth at Once?
What If the Sun Became a Black Hole?
What If Quetzalcoatlus Never Went Extinct?
What If You Fell into Saturn?
What If Trump Became a Dictator?
Entire Kardashev Scale Explained
Everything That Could Go Wrong
What If We Swapped Our Moon with Other Moons?
What If You Travelled 10 Quintillion Years into the Future?
The Largest Objects in the Universe Colliding
What If Antarctica Suddenly Melted?
What If Space Was Hot Instead of Cold?
What If You Were the Last Human on Earth?
What If Titanoboa Was Still Alive?
How Would You Die During Every Mass Extinction?
What If You Evolved on Jupiter?
What If We Nuked Uranus?
What If a Needle Hit You at the Speed of Light?
What If We Nuked Mars?
Swapping Our Moon with Alien Planets
What If You Dropped a Steak from Orbit?
What If the Earth Was Shaped Like a Cube?
How Your Voice Changes on Different Planets
What If We Nuked the Moon?
What If You Only Ate Protein?
The Worst Things We Can Do to Jupiter
What If We Lived on an Alderson Disk?
We Nuked Jupiter
What If We Nuked a Black Hole?
Episode 3: What If 3I/ATLAS Crashed into Earth?
Exploring the Possibility of Traveling to Kepler-452 b
What If Earth Was a Pulsar Planet?
What If a Needle Hit Earth at Light Speed?
What If Atlas Started an Invasion?
What If You Kept Shrinking Forever?
What Would Dying on Jupiter Feel Like?
What If Earth Was Shaped Like a Pizza?
What If a Black Hole Flew By Earth at the Speed of Light?
What if We Nuked the Sun?
What If the Earth Was Shaped Like a Dumbbell?
What If We Nuked Jupiter?!
What If The Earth Was Hollow?
What If We Changed Our Moon?
What If the Earth Was Flat?
What If Humanity Became a Type 1 Civilization?
What If We Built A Tunnel Between Continents?
How Big Can Black Holes Get?
What Would Dying on Venus Be Like?
What If We Replaced Fiat Money With Crypto?
Swapping Our Moon with Other Moons
What If You Fell Into Quicksand?
How Would Jupiter Swallow Every Planet?
What If You Could Smell Cancer?
What If We Actually Colonized Mars?
Surviving on Venus for 100 Days
Could You Hear Black Holes Collide?
Every Way Chase Has Died in Space - Part 1
The Day the World Changed Forever
What If Earth Were Trapped Between Two Suns?
Which Black Hole is the Biggest?
What If Every Asteroid Hit Earth at Once?
What If You Shrunk Every Second?
Can Cancer Really Hide From Your Body?
Biggest Lies and Conspiracies About Dinosaurs
The ISS Will Crash Into Earth
What If You Jumped into a Pool of Liquid Mercury?
NASA Reveals Signs of Ancient Life on Mars
Landing on Kepler-186 f
What If Tech Companies Were Honest? The Clippy Revolution!
Exoplanet Discoveries Unveiled
Episode Shorts: What If a Virus Could Help Cure Cancer?
What If a Needle Hit The Earth at Light Speed?
Travel Five Billion Years Into the Future
What If We Changed Our Sun?
Episode Shorts: What If AI Could End Diseases?
What Would Dying on Every Moon Be Like?
Episode Shorts: What If the Hubble Telescope Could Spy on You?
The Scariest Sounds in Space
Living in Every Prehistoric Era
Who Will Get Pied?
Help 2 Million People Access Clean Water
Everything We Still Don't Know About Black Holes
What If You Could Destroy a Rainbow?
Making Exoplanets Habitable
Could One of These Planets Be Humanity’s Next Home?
Episode Shorts: What If the Ocean Turned into Jello?
Episode Shorts: What REALLY Happens When a Dengue Mosquito Bites You?
What If Our Universe Was Inside a Black Hole?
Exploring Triton: 5-Second Adventure
Biggest Lies About Space and Dinosaurs
Auroras on Jupiter
Exploring the Unknowns of Exoplanets
Deadly Extinct Animals
Episode Shorts: What Would Dying on Pluto Be Like?
What Would Dying on Uranus Be Like?
Episode Shorts: What Would Dying on Mars Be Like?
What Would Dying on Jupiter Be Like?
If Earth Lost 1% of Oxygen Every Second
The Most Brutal Ways Humanity Ends
These Space Objects Collided
What Would Dying on Venus Be Like?
Future Tech That Could Save or Destroy Us All
Elon vs Trump: 10 Ways This Gets Worse
What Would Dying to Prehistoric Animals Be Like?
Future Tech That Could Save or Destroy Us All
Shorts: What If You Landed on Proxima Centauri b?
Episode Shorts: What If the Moon Collided With Earth?
Better for Life: Mars or Venus?
Episode Short: What If Jupiter Swallowed Every Planet in the Solar System?
Mars' Greatest Mysteries Explained
What If China Invaded Taiwan?
Episode Shorts: What If a Marshmallow Hit the Earth at the Speed of Light?
If Earth Became All Water
A More Advanced Civilization Existed Here Before Us?
What If We Nuked the Sun?
Episode Shorts: What If Our Bodies Kept Evolving?
Episode 635: What If You Lived on Kepler 22-b?
Shorts: What If Your Bones Were Bulletproof?
What If You Hibernated for 100 Years?
The Scariest Black Hole Discovery in Our Cosmic Backyard!
The Most Painful Deaths in Space
What If the Moon Collided With Earth?
Landing on Proxima Centauri-B
Living on Jupiter's Moons
What If We Destroyed a Black Hole?
Everything That Could Go Wrong With Rocky Planets
Living in the Cambrian Period: A Journey 500 Million Years Back
Leaving Earth: Megastructures That Could Save Humanity
The Scariest Things In The Ocean You Didn't Know Existed
Scientists Discover the Bermuda Triangle of Space
What If Space Was Filled With Air?
Episode Shorts: What If the Earth Had Two Moons?
What If Earth's Core Stopped Spinning?
Episode Shorts: What If You Drilled a Hole Through Earth?
Megalodon vs. Titanoboa: The Epic Showdown
Humans Evolving Backward
What If Jupiter and Uranus Collided?
What Happens if a Nuke Hits Near You?
What If TikTok Was Banned?
Surviving The Last of Us Scenario
If You Hibernated for 100 Years
What If You Drank Only Water for Your Entire Life?
What If Snakes Were Eliminated?
Is the Universe Conscious?
Scientists Discovered Planets Better for Life Than Earth
What If Earth Was as Small as Pluto?
Avatar's Pandora in Real Life is Terrifying
Earth Reaches Boiling Point for 5 Seconds
If Earth's Entire Population Lived in a Single Skyscraper
What If the Moon Orbited Earth Faster?
If Earth Became a Spaceship
What If Lizard People Ruled the World?
What If Cthulhu Was Real?
What If the Empire State Building Fell into a Sinkhole?
What Happens If the Largest Black Hole Enters Our Solar System?
Caught in a Riptide: Survival Tips
What If the Megalodon Shark Never Went Extinct?
What If Earth Was Split Equally Between Land and Water?
What If You Drank Radioactive Tritium
What Happens When the Queen Dies?
What If You Fell into a Yellowstone Hot Spring
If Latin America United as a Single Country
What If You Mated With Neanderthals?
What If 3I/ATLAS Collided with Earth?
What Would Happen If You Landed on Venus? Part 2
What Would Happen If You Landed on Venus? Part 2
What Would Happen If You Landed on Venus? Part 2
What Would Happen If You Landed on Venus? Part 2
What Would Happen If You Landed on Venus? Part 2
Living in the Stone Age
What If the Argentinosaurus Lived Today?
A Journey to the Edge of the Universe
What If You Had Eyes Like a Fly?
What If You Were Attacked by a Komodo Dragon
Bringing Dinosaurs Back From Extinction
Everything You Touched Turned Into Gold
Could You Power a Spaceship with Antimatter?
What Happens If You Swallow the World's Most Powerful Magnet?
Aliens at the Bottom of the Mariana Trench
What If You Had Camouflage Skin?
What If Humans Were Silicon-Based Instead of Carbon-Based?
What If You Were Attacked by a T. rex?
Living in the Hottest Place on Earth
Megalodon Shark vs. Leviathan Whale: Who Would Win?
What If the Sun Collided With a Black Hole?
What Happens If You Don't Sleep for a Week?
What If Russia Crashed the International Space Station
What If the Earth Was a Polyhedron?
Surviving the End of the Solar System
What If You Spent a Month on Snake Island?
Jumping on Every Planet in the Solar System
Can We Turn Deserts Into Farmland?
Spending 24 Hours in a Hot Spring
What If Men Could Get Pregnant?
What If the Oceans Were Made of Gasoline?
What If You Were Sucked Into a Whirlpool?
What If You Evolved 1,000 Years in a Day?
What If the Multiverse Was Real?
Creating a New Planet
Mullaperiyar Dam Collapse Scenario
Aliens Living Inside Earth?
What If All the World's Ice Melted?
What Happens If You Squat for 24 Hours?
What If You Lived in the Matrix?
The Solar System Song
Waking Up Volcanoes to Fight Climate Change
What If You Experienced the Most Painful Thing?
If the World Lost Oxygen for an Hour
What If the Earth Stopped Spinning for 5 Seconds
What If the U.S. Started World War III?
What If We Nuked Mars?
Could You Trap a Ghost Like a Ghostbuster?
Bringing Modern Technology to the Middle Ages
Earth with Jupiter's Moons
Waking Up During Heart Surgery
What If You Fell Into Lake Kivu?
What If You Were Bitten by One Million Mosquitoes?
What If the Big Bang Wasn't the Beginning of the Universe?
What If You Fell Off the World's Tallest Building?
What If America Were Split Apart?
What If You Swallowed Gallium?
What If You Ate Nothing But Caviar for a Month?
What If the Ice Age Never Happened?
Megalodon Shark vs. Kraken: A Legendary Showdown
What If the Oceans Lose Oxygen
Exploring Antarctica's Largest Subglacial Lake
What Happens If You Swallow a Hornet?
What If a Blazar Entered Our Solar System?
If Earth Were Sucked Into a Black Hole
What If Everyone Was Albino?
What If You Always Swallow Your Chewing Gum?
What If Titans Were Real?
What If You Jumped Into a Pool of Liquid Methane?
What If COVID-19 Never Disappears?
What If You Cut the Moon in Half?
What If You Wore 100 Layers of Makeup?
You Were the Last Child Born on Earth
Swapping Our Sun with Other Cosmic Objects
Discovery of Potential Alien Life on K2-18 b
What If the Moon Had Its Own Moon?
Jupiter's Greatest Mysteries Explained
Dying on Every Exoplanet: A Gruesome Exploration
What Happens If You Fall Into Neptune?
If Giant Sandworms Roamed Earth
What Happens If You Fall From the International Space Station?
If Your Skin Were Bullet-Proof
Building a Pipe to the Bottom of the Mariana Trench
A Black Neutron Star Enters the Solar System
Living in a Closed Biosphere
What If Uranus Collided With Earth?
Exploring Energy Drink Addiction with Danielle Robertson Rath
What If You Ate a Brick of Dry Ice?
What If 'Among Us' Were Real?
Living in Ancient Rome
What If You Fell Into a Pool of Aerogel?
What Happens If You Stop Brushing Your Teeth?
Terrifying Planets: Level 1 to 100
The Most Insane Things That Could Happen in Just 5 Seconds
Earth’s Greatest Mysteries Explained
What Will Humanity Be Like in the Future?
What Happens If We Pour Earth's Water on the Sun?
What Would Happen if Every Planet Collided?
What If Pluto Was a Real Planet?
What Happens to Your Body If You Get Nuked?
Episode Shorts: What If You Touched the Sun?
Evolution of the Sun Explained
What If Earth's Plastic Suddenly Disappeared?
20 Potential Threats to Humanity in 2025
What If the Mosasaurus Never Stopped Evolving?
Traveling to Gliese 12 b
What If Extinct Creatures Never Stopped Evolving
Dying on Every Planet: What It Would Be Like
What If You Fell Into Jupiter?
Evolving to a Type 7 Civilization
What If Earth Was Exactly Half Land and Half Ocean?
What If Humans Became as Big as Dinosaurs?
What If Our Planet Froze Over?
Things You Were Lied to About Space
Building Your Own Periodic Table
Scientists Discovered a Planet More Terrifying Than Earth
Everything That Could Go Wrong With Jupiter
What If Everything You Knew About the Universe Is Wrong?
What If Humanity Had to Leave Earth?
Why You Can't Walk On Saturn
Seeing a Star Being Born
What If Earth Orbited the Sun at Light Speed?
The Most Extreme Cold Scenarios Ever
Falling Into a Black Neutron Star
Could Every Planet in the Solar System Have a Twin?
Where Will We Go After Earth Becomes Uninhabitable?
What If Mars Was Half Land and Half Water?
Is There Life on Kepler 69c?
What If Earth Orbited Jupiter?
What If Humans Suddenly Went Extinct?
Traveling Through a Black Hole
Crashing on an Alien Planet
Recap of Top What If Scenarios
What If Earth Stopped Spinning
What If Jupiter Collided With Earth?
Kepler 22-b: Imagining It in Our Solar System
What If Giant Bugs Roamed the Earth?
What If South America and Africa Joined Together?
What If All the Planets Doubled in Size?
The Most Dangerous Things You Could Jump Into
Taking a Ride on Halley's Comet
What If We Nuked the Sun?
Rebuilding Human Society from Scratch
What If an Asteroid Cracked the Moon in Half?
Living on Kepler 22-b: Exploring Potential for Human Life
What If Earth Was Always Facing the Sun?
Replacing the Moon with a Disco Ball
If Putin Never Came to Power
What If You Aged Backwards?
Aliens Visit Earth One Million Years in the Future
What If Styxosaurus Was Alive?
Exploring the Search for Alien Life
Venus and Mars Swapping Orbits: A Hypothetical Exploration
What If Earth Spun on Its Side
What If the Sun Was a Blue Star?
What If You Were Born on the Moon?
Could Solar Panels Orbit the Sun?
What If Earth Was Between Two Asteroid Belts?
What If Putin Launched a Nuke?
What If the Largest Asteroid Hit Earth?
Living in a Cosmic Skyscraper
What If the Earth Had No Core?
What Happens When a Marshmallow Hits Earth at Light Speed?
What If Putin Died?
Living in the Paleozoic Era
What If You Witnessed the Big Bang?
If All Planets Were in the Habitable Zone
Spending a Day on Every Planet in Our Solar System
Knew What Would Happen in 100 Years?
Worst Places to Swim
What If You Could Hear Planets
What If Earth Had 10 Years Left?
Could We Reheat Earth's Core?
Trapped in a Grocery Store for Life
What If We Never Landed on the Moon?
What If Earth Went Rogue?
Drilling a Hole Through Earth: A Hypothetical Journey
What If Planets Replaced Our Moon?
Traveling One Billion Years Into the Past
Building a City on Mars
We Discovered Earth 2.0
Nuclear-Powered Rockets: Exploring the Future of Space Travel
What If Lightsabers Were Real?
Flying to Space on a Jetpack
What If You Were the Dirtiest Man on Earth?
Exploring a Billion Years Into the Future
What If No One Ever Died
What If You Ate Sugar for a Month? with Gary Taubes
What If the Earth Was Actually Flat?
The First 48 Hours After Aliens Make Contact
What Was Earth Like 2 Billion Years Ago?
Spending 5 Seconds on Io