How Many Universes Are There?

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE↓ More info below ↓Uploaded 30-09-19Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetimeCheck out the Space Time Merch Storehttps://pbsspacetime.com/The universe is big, but it’s peanuts compared to the eternally inflating multiverse. But just how many universes are there? What are they like? And most importantly, what can they tell us about … aliens?Challenge Answer WinnersSteven MertensDavid DeLaneyChris LoteryEnekoFabien SangouardIan Bonnell*Please email your selection from the Space Time Merch Store along with your address to [email protected] with the subject line “Challenge Question Winner”Hosted by Matt O'DowdWritten by Matt O'DowdGraphics by Leonardo ScholzerDirected by: Andrew KornhaberExecutive Producers: Eric Brown and Andrew KornhaberEnd Credits Music by J.R.S. Schattenberg: https://www.youtube.com/channel/UCRl6-nb4iOnsij-vnpAjp0QImagine it: the observable part of our universe is 93 billion light years across, and that’s just a small fraction of the stuff created in our Big Bang. But in the eternal inflation picture, ours is just one among uncountable bubble universes. Bubbles that are continuously appearing and growing within a vastly larger spacetime that itself expands at an exponentially accelerating rate. A greater inflationary spacetime whose expansion never ends. We looked at the bizarre idea of eternal inflation in recent episodes – but we stopped short of exploring the full implications of this proposition. Those implications are, frankly, completely nuts. Some may also be true.Big Bang Supporters:Alexander TamasAnton LifshitsDavid BarnholdtDavid BoyerDavid NicklasFabrice EapJuan BenetJustin LloydMatt MillerMorgan HoughQuasar Supporters:Mark HeisingMark RosenthalVinnie FalcoHypernova Supporters:Chuck ZegarDanton SpiveyDonal BotkinEdmund FokschanerHank SJoe PearceJohn HofmannJohn R.