What If: Science, Theory, and Possibilities

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 that’s where you’re headed. The moment before the Bi...

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? 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 “down.” Support us on Patreon: patreon.com/whatifshow/membershipGet the What if book: bit.ly/ytc-the-what-if-100-bookJoin this channel to get access to perks: youtube.com/channel/UCphTF9w...

Discovered by NASA’s 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. Support us on Patreon. Get the What If book: here. Join this channel to get access to perks: here. Interested in sponsoring our episodes or col...

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? Support us on Patreon: https://www.patreon.com/whatifshow/membershipGet the What if book: http://bit.ly/ytc-the-what-if-100-bookJoin this channel to get access t...

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...

Imagine if all the Earth’s oxygen disappeared, not forever, just for 5 seconds. Would we just hold our breath? What would happen to the atmosphere and the environment? Here’s what would happen if the world lost oxygen for just 5 seconds. Support us on Patreon: PatreonGet the What If book: The What If BookJoin this channel to get access to perks: Join Channel Interested in sponsoring our episodes o...

Dive deeper into science and discovery with Popular Science, a free streaming channel offering epic explorations in engineering, rocket launches, movies, space, and Earth sciences. Check it out here. Support us on Patreon: here Check out our other channels: How to Survive: hereAnimalogic: hereAperture: here T-shirts and merch: here Follow What If on:Instagram: hereDiscord: herePodcast: here What I...

Venus is often called Earth’s 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, it’s one of the most extreme worlds in the Solar System. But what would actually happen if we detonated nuclear weapons on Venus? Support us on Patreon: https://www.patreon.com/whatifshow/membershi...

What would happen if Earth’s Moon suddenly vanished and Jupiter’s 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. Support us on Patreon: hereGet the What If book: hereJoin this channel to get access to perks: here Interested in sponsoring our episodes or collaborating? Email us: contact@underknow...

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 wasn’t just turbulent… what if it was a turning point that locked in humanity’s future? Support us on Patreon: patreon.com/whatifshow/membership Get the What if book: bit.ly/ytc-the-what-if-100-book Join this channel to get access to per...

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? Support us on Patreon: patreon.com/whatifshow/membership Get the What If book: bit.ly/ytc-the-what-if-100-book Join this channel to get access to perks: youtube.com/join Interested in sponsoring our episodes or collaborating? Email us: contact@unde...

Take your personal data back with Incogni! Use code WHAT at the link below and get 60% off an annual plan: https://incogni.com/what 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. Support us on Patreon: https://www.patreon.com/whatifshow/membership Get the What If book: http://bit.ly/ytc-the-what-if-10...

Enjoying this video? Dive deeper into science and discovery with Popular Science, a free streaming channel offering epic explorations in engineering, rocket launches, movies, space, and Earth sciences. Support us on Patreon Check out our other channels:How to SurviveAnimalogicAperture T-shirts and merch: What If Store What If elsewhere:Instagram: What If InstagramDiscord: What If DiscordPodcast: W...

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. Support us on Patreon: Patreon Get the What If book: What If Book Join this channel to get access to perks: Join Channel Interested in sponsoring our episodes...

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? Support us on Patreon: https://www.patreon.com/whatifshow/membership Get the What if book: http://bit.ly/ytc-the-what-if-100-book Join this channel to get access to perks: https://www.youtube....

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! Made p...

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? Made possible with the support of Ontario Creates: ontariocreates.ca Support us on Patreon: pat...

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? Support us on Patreon: https://www.patreon.com/whatifshow/membershipGet the What if book: http://bit.ly/ytc-th...

The Sun won’t shine forever in its current form. When it runs out of hydrogen, it will expand into a red giant—fundamentally reshaping the Solar System. Support us on Patreon: patreon.com/whatifshow/membershipGet the What if book: bit.ly/ytc-the-what-if-100-bookJoin this channel to get access to perks: youtube.com/channel/UCphTF9wHwhCt-BzIq-s4V-g/join Interested in sponsoring our episodes or colla...

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 Boötes 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...

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...

Help us win a Webby by voting here. Support us on Patreon: Patreon From the sun going rogue to unstoppable infections and nature’s wildest disasters—today we explore every way humanity could meet its end. This YouTube video was conducted on behalf of Onco-Innovations Ltd. (CSE: ONCO.CN | OTC: ONNVF) and funded by Outside The Box Capital Inc. after Backyard Media d/b/a Underknown was engaged by Out...

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 back—and this time, we’re raising the stakes even higher. Get ready for bigger questions, crazier scenarios, and some of the most hostile places in the Universe. We’re talking supernovas, black...

What if you started digging and never stopped, until you broke through the other side of Mars? Would you fall forever? Would Mars’ gravity crush you? Or would the planet’s core stop you long before you reached the center? Support us on Patreon: Patreon MembershipGet the What if book: The What If BookJoin this channel to get access to perks: YouTube Membership Interested in sponsoring our episodes...