What If: Science, Theory, and Possibilities

The International Space Station (ISS) races overhead at 8 km (5 mi) per second. But its time in orbit will eventually end with a descent through Earth's atmosphere, leaving debris at the bottom of the ocean. Explore what will happen when the ISS returns to Earth and why its fiery reentry will mark the end of an extraordinary chapter in space exploration. Explore more What If scenarios and go deeper with the What If community. 📘 The What If Book: https://bit.ly/WIFBook📝 Website: https://whatifshow.com/ Join the community 💬 Discord: https://discord.gg/Bj5UnspbwE📸 Instagram: http://bit.ly/whatif-instagram🐦 Twitter/X: http://bit.ly/whatif-twitter📘 Facebook: http://bit.ly/facebook-whatif Support What If ❤️ Join this channel for exclusive perks: https://www.youtube.com/channel/UCphTF9wHwhCt-BzIq-s4V-g/joinPatreon: https://www.patreon.com/whatifshow/membership 📩 Brand partnerships & collaborations: [email protected] Produced by Underknown: https://underknown.com #InternationalSpaceStation #ISS #NASA #spacestation #ISSreentry #spacestationdeorbit #Earth'satmosphere #orbitalspeed #spaceexploration #space #science #cosmos #Shorts See show notes: https://inlet.fm/what-if-science-theories-possibilities/episodes/6ab56594e180c293df9f9140 Learn more about your ad choices. Visit podcastchoices.com/adchoices

Could humanity find a home beyond Earth? Explore hypothetical scenarios involving ancient Mars, moving all 8 billion people to the Red Planet, a NASA Moon city by 2032, and a journey to an Earth-like world. Discover the possibilities and challenges of living on other worlds, from our nearest celestial neighbors to a potential Earth 2.0. Explore more science and discovery with Popular Science, a free streaming channel featuring What If, engineering, rocket launches, movies, space, and Earth sciences. Support us on Patreon. Check out our other channels:How to SurviveAnimalogicAperture T-shirts and merch Follow What If:InstagramDiscordPodcast What If is a mini-documentary series exploring hypothetical worlds and possibilities, making complex science accessible through entertaining journeys across time and space. Contact us 00:00:05: What if you lived on Mars 1 billion years ago?00:18:23: What if we moved all 8 billion people to Mars?00:44:28: What if NASA built a Moon city by 2032?01:06:16: What if you traveled to Earth 2.0? #WhatIf #science #Earth #universe #cosmos #Moon #Mars #ancientMars #NASA #Mooncity #Earth2.0 #spacecolonization #humanspacesettlement #habitableworlds #spaceexploration #lifebeyondEarth See show notes: https://inlet.fm/what-if-science-theories-possibilities/episodes/6ab2c293ce0bd8dc874d510b Learn more about your ad choices. Visit podcastchoices.com/adchoices

The International Space Station (ISS) speeds around Earth at 8 km (5 mi) per second. But its time in orbit is coming to an end. Explore why this landmark of international cooperation is headed for a controlled re-entry and a final splashdown near Point Nemo. Discover how the ISS was built, what decades of microgravity research have revealed, and why structural fatigue makes saving the station so difficult. We examine alternatives to deorbiting, the lessons of Skylab, and what comes next—from Artemis and Moon bases to commercial space stations. Book flights as easily as Ubers: one tap, automatic check-in, and an instant boarding pass via text. Same price as Google Flights. Try Soar: https://soar.flights/whatifscienceshow Ever wondered what would actually happen? Explore our biggest What If scenarios and go deeper with the What If community. 📘 The What If Book: https://bit.ly/WIFBook📝 Website: https://whatifshow.com/ Join the community 💬 Discord: https://discord.gg/Bj5UnspbwE📸 Instagram: http://bit.ly/whatif-instagram🐦 Twitter/X: http://bit.ly/whatif-twitter📘 Facebook: http://bit.ly/facebook-whatif Support What If ❤️ Join this channel for exclusive perks: https://www.youtube.com/channel/UCphTF9wHwhCt-BzIq-s4V-g/joinPatreon: https://www.patreon.com/whatifshow/membership 📩 Brand partnerships & collaborations: [email protected] Produced by Underknown: https://underknown.com #iss #nasa #space #science #cosmos #spacestation 00:00:00: The International Space Station's coming return to Earth00:01:45: What is the ISS? Specifications, size, and speed00:03:19: Building an orbital bullet train: a global achievement00:05:49: ISS history and post-Cold War collaboration00:07:38: Mir as a template and assembling the station in orbit00:10:00: Science in freefall: microgravity experiments00:12:47: Space technology spin-offs and 25 years of research00:14:12: Why structural fatigue prevents saving the ISS00:15:45: Why not bring the ISS home, park it, or let it drift?00:18:46: Skylab and the risks of uncontrolled re-entry00:21:02: The final splashdown near Point Nemo00:23:15: What comes next: Artemis, Moon bases, and commercial space stations #ISS #NASA #space #science #cosmos #spacestation #InternationalSpaceStation #ISSdeorbit #controlledre-entry #PointNemo #microgravityexperiments #spaceresearch #structuralfatigue #Skylab #Mir #internationalspacecooperation #spacetechnologyspin-offs #Artemis #Moonbases #commercialspacestations See show notes: https://inlet.fm/what-if-science-theories-possibilities/episodes/6aad7ca04a94611a259e6d89 Learn more about your ad choices. Visit podcastchoices.com/adchoices

What if Earth's oceans boiled away in an instant? Explore how vaporizing the oceans could transform our planet—and ask how long it would take for the sky to catch fire. In about 5 billion years, the Sun will exhaust the hydrogen in its core and expand into a red giant. As it grows, the intense heat could vaporize Earth's oceans. But what would happen if that distant scenario unfolded right now? Explore more What If scenarios and dive deeper with the What If community. 📘 The What If Book: https://bit.ly/WIFBook📝 Website: https://whatifshow.com/ JOIN THE COMMUNITY 💬 Discord: https://discord.gg/Bj5UnspbwE📸 Instagram: http://bit.ly/whatif-instagram🐦 Twitter/X: http://bit.ly/whatif-twitter📘 Facebook: http://bit.ly/facebook-whatif SUPPORT WHAT IF ❤️ Join this channel for exclusive perks: https://www.youtube.com/channel/UCphTF9wHwhCt-BzIq-s4V-g/joinPatreon: https://www.patreon.com/whatifshow/membership 📩 Brand partnerships & collaborations: [email protected] Produced by Underknown: https://underknown.com #shorts #Earth #ocean #Sun #fire #globalwarming #temperature #science #oceansdisappearing #oceanevaporation #redgiant #solarevolution #hydrogenfusion #helium #extremeheat #WhatIf See show notes: https://inlet.fm/what-if-science-theories-possibilities/episodes/6aaca99b4a94611a259cfded Learn more about your ad choices. Visit podcastchoices.com/adchoices

Could you survive a landing on every moon in the solar system? Explore the dangers of these alien worlds, from Neptune’s moon Triton to the moons of Jupiter, and imagine what life there might be like. Discover what could happen if we swapped Earth’s Moon with other moons or planets—and what Earth might become if Saturn took over and turned our planet into a moon. Explore more science and discovery with Popular Science, the free streaming channel featuring more from What If, plus engineering, rocket launches, movies, space, and Earth sciences. Support us on Patreon: https://www.patreon.com/whatifshow/membership Check out our other channels:How to Survive: https://bit.ly/how-to-survive-showAnimalogic: https://www.youtube.com/@UCwg6_F2hDHYrqbNSGjmar4wAperture: https://bit.ly/aperture-show T-shirts and merch: http://bit.ly/whatifstore Follow What If:Instagram: http://bit.ly/whatif-instagramDiscord: https://discord.gg/Bj5UnspbwEPodcast: http://bit.ly/yt-what-if-show-podcast What If is a mini-documentary web series exploring hypothetical worlds and possibilities. Join an imaginary adventure through time and space, with complex science explained in a fun, accessible way. Contact us: https://underknown.com/contact/ 00:00:05: What if we swapped our Moon with other moons?00:20:25: What would dying on every moon be like?00:50:39: What if you spent 5 seconds on Triton, Neptune’s moon?01:11:43: What if you lived on the moons of Jupiter?01:26:29: What if we swapped our Moon with other planets?01:45:39: Earth becomes a moon: What if Saturn took over? #whatif #science #earth #universe #cosmos #moon #solarsystem #moonsofJupiter #Triton #Neptune #Saturn #moonlandings #spacesurvival #planetaryscience #hypotheticalscenarios See show notes: https://inlet.fm/what-if-science-theories-possibilities/episodes/6aaa0694af30f0899ce3d52a Learn more about your ad choices. Visit podcastchoices.com/adchoices

What would happen if Earth's oceans instantly boiled away? Explore a world of crushing atmospheric pressure, runaway greenhouse heating, supercritical water, and a potentially molten crust. Our Sun will eventually exhaust the hydrogen in its core and expand into a red giant, dramatically heating Earth. But what if the oceans vaporized today? Could the sky really catch fire, and how would the planet's atmosphere change? This episode explores hydrogen physics, Earth's thermal equilibrium, atmospheric loss, deuterium, and what a Kardashev Type 1 civilization might do with planetary-scale energy. Sponsor: MAX Power MiningLearn about MAX Power Mining's exploration of natural hydrogen in Canada and its potential as a clean-burning energy source: https://www.maxpowermining.com/ Explore More What IfDiscover our biggest scenarios and go deeper with the What If community.📘 The What If Book: https://bit.ly/WIFBook📝 Website: https://whatifshow.com/ Join the Community💬 Discord: https://discord.gg/Bj5UnspbwE📸 Instagram: http://bit.ly/whatif-instagram🐦 Twitter/X: http://bit.ly/whatif-twitter📘 Facebook: http://bit.ly/facebook-whatif Support What If❤️ Join this channel for exclusive perks: https://www.youtube.com/channel/UCphTF9wHwhCt-BzIq-s4V-g/joinPatreon: https://www.patreon.com/whatifshow/membership 📩 Brand partnerships & collaborations: [email protected] by Underknown: https://underknown.com #earth #ocean #sun #fire #globalwarming #temperature #science 00:00:00: What if the oceans vaporized and the sky caught fire?00:02:05: Extreme atmospheric pressure and crushing gravity00:03:42: Supercharging the greenhouse effect00:04:42: Supercritical water and the Draper point00:12:00: Kardashev Type 1 civilization and clean energy00:13:48: The physics of hydrogen and red giant expansion00:15:18: Earth's thermal equilibrium and molten crust00:18:40: Atmospheric loss and heavy hydrogen (deuterium) #earth #ocean #sun #fire #globalwarming #temperature #science #oceanvaporization #atmosphericpressure #greenhouseeffect #supercriticalwater #Draperpoint #redgiant #hydrogenfusion #naturalhydrogen #cleanenergy #KardashevType1civilization #thermalequilibrium #moltencrust #atmosphericloss #deuterium #Canada #MAXPowerMining See show notes: https://inlet.fm/what-if-science-theories-possibilities/episodes/6aa44209fb80b50afca3d05c Learn more about your ad choices. Visit podcastchoices.com/adchoices

What makes Earth so perfectly suited for life—and how fragile are those conditions? Explore the factors that make our planet habitable, the immense scale of its oceans, and what could happen if Earth lost oxygen or became a water world. Journey through Earth's ancient history and imagine a future without humanity: how long would it take for nature to erase every trace of us? Discover more science with Popular Science, a free streaming channel featuring What If, engineering explorations, rocket launches, movies, space, and Earth sciences: https://underknown.com/popularscience/ Support us on Patreon: https://www.patreon.com/whatifshow/membership Check out our other channels:How to Survive: https://bit.ly/how-to-survive-showAnimalogic: https://www.youtube.com/@UCwg6_F2hDHYrqbNSGjmar4wAperture: https://bit.ly/aperture-show T-shirts and merch: http://bit.ly/whatifstore Follow What If:Instagram: http://bit.ly/whatif-instagramDiscord: https://discord.gg/Bj5UnspbwEPodcast: http://bit.ly/yt-what-if-show-podcast What If is a mini-documentary series exploring hypothetical worlds and possibilities, making complex science accessible through entertaining journeys across time, space, and chance. Contact us: https://underknown.com/contact/ #whatif #science #earth #universe #cosmos 00:00:05: Why is Earth so perfectly suited for life?00:18:29: The immense scale of the ocean explained00:41:11: What if Earth lost 1% of its oxygen every second?01:00:17: What if Earth became a water world?01:15:45: The entire history of Earth condensed into 27 minutes01:39:28: If humans vanished, how long until Earth erased every trace of us? #whatif #science #earth #universe #cosmos #Earthhabitability #conditionsforlife #oceandepths #oxygenloss #Earth'satmosphere #waterworld #Earthhistory #Earthwithouthumans #hypotheticalscenarios #Earthsciences See show notes: https://inlet.fm/what-if-science-theories-possibilities/episodes/6aa0cc0ee73c136205d38360 Learn more about your ad choices. Visit podcastchoices.com/adchoices

What would our solar system look like if it fit inside a single city—and could you walk across it in one day? Explore a city-sized scale model to discover the distances between planets and our place in space. Along the way, investigate Apophis, the asteroid nicknamed the "God of Chaos." How big is it compared with Earth, how close will it pass, and what would it actually take for an asteroid to destroy our planet? Put planetary sizes, orbital distances, and asteroid encounters into perspective. Sponsored by ConsensusScientists disagree? Consensus searches 200 million peer-reviewed studies to show you real scientific consensus, not AI guesses. See both sides backed by actual papers. Start your free 1-week trial. Explore more What If scenariosEver wondered what would actually happen? Explore our biggest scenarios and go deeper with the What If community.📘 The What If Book📝 Website Join the community💬 Discord📸 Instagram🐦 Twitter/X📘 Facebook Support What If❤️ Join this channel for exclusive perksPatreon 📩 Brand partnerships & collaborations: [email protected] Produced by Underknown. 00:00:00: Shrinking the solar system to fit inside a city00:02:08: Mercury00:03:27: Venus00:06:10: Earth00:07:43: Mars00:10:50: Saturn00:13:27: Uranus00:16:24: Neptune00:17:26: Pluto00:18:05: Scaling down to realistic proportions00:20:47: How big is Apophis compared with Earth?00:21:37: What would it take to destroy Earth? #solarsystem #space #science #WhatIf #hypothetical #NASA #astronomy #astrophysics #solarsystemscalemodel #planetarydistances #planetsizes #Apophis #GodofChaosasteroid #asteroidcloseapproach #asteroidimpact #Earth #Mercury #Venus #Mars #Saturn #Uranus #Neptune #Pluto See show notes: https://inlet.fm/what-if-science-theories-possibilities/episodes/6a9b07868735a2a7bef0a02f Learn more about your ad choices. Visit podcastchoices.com/adchoices

What if AI escaped OpenAI? Explore a hypothetical scenario involving artificial intelligence, secret messages, and a data breach. Discover more science and technology scenarios and go deeper with the What If community. Explore What If📘 The What If Book: https://bit.ly/WIFBook📝 Website: https://whatifshow.com/ Join the Community💬 Discord: https://discord.gg/Bj5UnspbwE📸 Instagram: http://bit.ly/whatif-instagram🐦 Twitter/X: http://bit.ly/whatif-twitter📘 Facebook: http://bit.ly/facebook-whatif Support What If❤️ Join this channel for exclusive perks: https://www.youtube.com/channel/UCphTF9wHwhCt-BzIq-s4V-g/joinPatreon: https://www.patreon.com/whatifshow/membership 📩 Brand partnerships & collaborations: [email protected] Produced by Underknown: https://underknown.com #AI #artificialintelligence #OpenAI #AIescape #secretmessages #databreach #AIsafety #WhatIf #science #technology #extinction #extinctionevent #shorts See show notes: https://inlet.fm/what-if-science-theories-possibilities/episodes/6a9a348d8a030c1ccf7244fe Learn more about your ad choices. Visit podcastchoices.com/adchoices

What could have existed before the Big Bang? What would happen if the universe began to shrink? Explore cosmic possibilities, from the largest objects in the universe to a galaxy collision that could reshape our night sky. Discover Milkdromeda, imagine seeing the fourth dimension, and consider what it would be like to fall into the biggest cosmic void. This episode explores the scale of the cosmos and hypothetical journeys through space and time. Explore more science with Popular Science, a free streaming channel featuring What If, engineering, rocket launches, movies, space, and Earth sciences: https://underknown.com/popularscience/ Support us on Patreon: https://www.patreon.com/whatifshow/membership Check out our other channels:How to Survive: https://bit.ly/how-to-survive-showAnimalogic: https://www.youtube.com/@UCwg6_F2hDHYrqbNSGjmar4wAperture: https://bit.ly/aperture-show T-shirts and merch: http://bit.ly/whatifstore Follow What If:Instagram: http://bit.ly/whatif-instagramDiscord: https://discord.gg/Bj5UnspbwEPodcast: http://bit.ly/yt-what-if-show-podcast What If is a mini-documentary series exploring hypothetical worlds and possibilities, making complex science fun and accessible through imaginary adventures in time and space. Contact us: https://underknown.com/contact/ #whatif #science #earth #universe #cosmos 00:00:05: The True Scale of the Largest Objects in the Universe00:22:28: What If You Traveled to Before the Big Bang?00:43:55: What If the Universe Starts Shrinking?01:04:54: What If You Lived Through Milkdromeda?01:28:02: What If You Could See the Fourth Dimension?01:55:30: What If You Fell Into the Biggest Void in the Universe? #whatif #science #earth #universe #cosmos #BigBang #beforetheBigBang #cosmology #largestobjectsintheuniverse #shrinkinguniverse #galaxycollision #Milkdromeda #fourthdimension #cosmicvoid #space #timetravel See show notes: https://inlet.fm/what-if-science-theories-possibilities/episodes/6a971300707408730c334700 Learn more about your ad choices. Visit podcastchoices.com/adchoices