Science & Futurism with Isaac Arthur

Are we alone in the universe—or just early to the party? We’ll explore the math, models, and megastructures that might answer how many alien civilizations are out there, and why the night sky remains so quiet. Watch my exclusive video Fishbowl Starships - Water As Shielding - https://nebula.tv/videos/isaacarthur-fishbowl-starships-water-as-shielding Get Nebula using my link for 40% off an annual subscription: https://go.nebula.tv/isaacarthur Get a Lifetime Membership to Nebula for only $300: https://go.nebula.tv/lifetime?ref=isaacarthur Use the link gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $30. Visit our Website: http://www.isaacarthur.net Join Nebula: https://go.nebula.tv/isaacarthur Support us on Patreon: https://www.patreon.com/IsaacArthur Support us on Subscribestar: https://www.subscribestar.com/isaac-arthur Facebook Group: https://www.facebook.com/groups/1583992725237264/ Reddit: https://www.reddit.com/r/IsaacArthur/ Twitter: https://twitter.com/Isaac_A_Arthur on Twitter and RT our future content. SFIA Discord Server: https://discord.gg/53GAShE Credits: How Many Alien Civilizations Are There? Episode 723; June 8, 2025  Written, Produced & Narrated by: Isaac Arthur Editor: Ludwig Luska Graphics: Ken York YD Visual Select imagery/video supplied by Getty Images Music Courtesy of Epidemic Sound http://epidemicsound.com/creator Phase Shift, "Forest Night"  Chris Zabriskie, "Unfoldment, Revealment" & "A New Day in a New Sector"  Koalips, "Kvazar"  Stellardrone, "Red Giant" & "Billions and Billions" See Privacy Policy at https://art19.com/privacy [https://art19.com/privacy] and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info [https://art19.com/privacy#do-not-sell-my-info].

Are we alone in the universe—or just early to the party? We’ll explore the math, models, and megastructures that might answer how many alien civilizations are out there, and why the night sky remains so quiet. Watch my exclusive video Fishbowl Starships - Water As Shielding - https://nebula.tv/videos/isaacarthur-fishbowl-starships-water-as-shielding Get Nebula using my link for 40% off an annual subscription: https://go.nebula.tv/isaacarthur Get a Lifetime Membership to Nebula for only $300: https://go.nebula.tv/lifetime?ref=isaacarthur Use the link gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $30. Visit our Website: http://www.isaacarthur.net Join Nebula: https://go.nebula.tv/isaacarthur Support us on Patreon: https://www.patreon.com/IsaacArthur Support us on Subscribestar: https://www.subscribestar.com/isaac-arthur Facebook Group: https://www.facebook.com/groups/1583992725237264/ Reddit: https://www.reddit.com/r/IsaacArthur/ Twitter: https://twitter.com/Isaac_A_Arthur on Twitter and RT our future content. SFIA Discord Server: https://discord.gg/53GAShE Credits: How Many Alien Civilizations Are There? Episode 723; June 8, 2025  Written, Produced & Narrated by: Isaac Arthur Editor: Ludwig Luska Graphics: Ken York YD Visual Select imagery/video supplied by Getty Images Music Courtesy of Epidemic Sound http://epidemicsound.com/creator Phase Shift, "Forest Night"  Chris Zabriskie, "Unfoldment, Revealment" & "A New Day in a New Sector"  Koalips, "Kvazar"  Stellardrone, "Red Giant" & "Billions and Billions" See Privacy Policy at https://art19.com/privacy [https://art19.com/privacy] and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info [https://art19.com/privacy#do-not-sell-my-info].

A new industrial revolution is coming—not on Earth, but above it. This episode delves into how orbital shipyards will produce everything from shuttles to megastructures, changing how we explore and inhabit space. Watch my exclusive video Fishbowl Starships - Water As Shielding - https://nebula.tv/videos/isaacarthur-fishbowl-starships-water-as-shielding Get Nebula using my link for 40% off an annual subscription: https://go.nebula.tv/isaacarthur Get a Lifetime Membership to Nebula for only $300: https://go.nebula.tv/lifetime?ref=isaacarthur Use the link gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $30. Visit our Website: http://www.isaacarthur.net Join Nebula: https://go.nebula.tv/isaacarthur Support us on Patreon: https://www.patreon.com/IsaacArthur Support us on Subscribestar: https://www.subscribestar.com/isaac-arthur Facebook Group: https://www.facebook.com/groups/1583992725237264/ Reddit: https://www.reddit.com/r/IsaacArthur/ Twitter: https://twitter.com/Isaac_A_Arthur on Twitter and RT our future content. SFIA Discord Server: https://discord.gg/53GAShE Credits: Orbital Shipyards: Building Fleets in Space Episode 722; June 5, 2025; Nebula Exclusive Written, Produced, & Narrated by: Isaac Arthur Graphics: Anthrofuturism Bryan Versteeg Fishy Tree Jeremy Jozwik Melanovis Sergio Botero SpaceResourcesCGI Udo Schroeter Select imagery/video supplied by Getty Images Music Courtesy of Epidemic Sound http://epidemicsound.com/creator Phase Shift, "Forest Night" Kai Engel, "Endless Story of Sun and Moon" Chris Zabriskie, "Unfoldment, Revealment", "A New Day in a New Sector", "Oxygen Garden" Stellardrone, "Red Giant", "Billions and Billions" Chapters 0:00 Intro 0:15 Why Build in Orbit? 1:29 The Gravity Well Problem 3:22 Material Sourcing – The Importance of ISRU 5:44 Early Orbital Shipyards – Existing & Near-Future Projects 6:37 Lessons from Space Stations & Prototypes 8:22 Port George & Linus Scrapyard – Revisiting Fictional Shipyards 13:08 Infrastructure & Logistics of Orbital Shipyards 23:39 Constructing Different Types of Ships 31:58 Challenges of Large-Scale Shipbuilding 34:10 Maintenance, Repairs, and Refits – Sustaining a Spacefaring Fleet 39:25 Salvage and Recycling 40:37 The Future of Orbital Shipyards – Expanding Beyond Earth 43:03 The Rise of Megastructure Shipyards 44:29 Privatization and the Spacefaring Economy 46:12 Shipyards as Strategic Military and Political Assets 47:54 The Role of AI, Automation, and Post-Human Workforces See Privacy Policy at https://art19.com/privacy [https://art19.com/privacy] and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info [https://art19.com/privacy#do-not-sell-my-info].

A new industrial revolution is coming—not on Earth, but above it. This episode delves into how orbital shipyards will produce everything from shuttles to megastructures, changing how we explore and inhabit space. Watch my exclusive video Fishbowl Starships - Water As Shielding - https://nebula.tv/videos/isaacarthur-fishbowl-starships-water-as-shielding Get Nebula using my link for 40% off an annual subscription: https://go.nebula.tv/isaacarthur Get a Lifetime Membership to Nebula for only $300: https://go.nebula.tv/lifetime?ref=isaacarthur Use the link gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $30. Visit our Website: http://www.isaacarthur.net Join Nebula: https://go.nebula.tv/isaacarthur Support us on Patreon: https://www.patreon.com/IsaacArthur Support us on Subscribestar: https://www.subscribestar.com/isaac-arthur Facebook Group: https://www.facebook.com/groups/1583992725237264/ Reddit: https://www.reddit.com/r/IsaacArthur/ Twitter: https://twitter.com/Isaac_A_Arthur on Twitter and RT our future content. SFIA Discord Server: https://discord.gg/53GAShE Credits: Orbital Shipyards: Building Fleets in Space Episode 722; June 5, 2025; Nebula Exclusive Written, Produced, & Narrated by: Isaac Arthur Graphics: Anthrofuturism Bryan Versteeg Fishy Tree Jeremy Jozwik Melanovis Sergio Botero SpaceResourcesCGI Udo Schroeter Select imagery/video supplied by Getty Images Music Courtesy of Epidemic Sound http://epidemicsound.com/creator Phase Shift, "Forest Night" Kai Engel, "Endless Story of Sun and Moon" Chris Zabriskie, "Unfoldment, Revealment", "A New Day in a New Sector", "Oxygen Garden" Stellardrone, "Red Giant", "Billions and Billions" Chapters 0:00 Intro 0:15 Why Build in Orbit? 1:29 The Gravity Well Problem 3:22 Material Sourcing – The Importance of ISRU 5:44 Early Orbital Shipyards – Existing & Near-Future Projects 6:37 Lessons from Space Stations & Prototypes 8:22 Port George & Linus Scrapyard – Revisiting Fictional Shipyards 13:08 Infrastructure & Logistics of Orbital Shipyards 23:39 Constructing Different Types of Ships 31:58 Challenges of Large-Scale Shipbuilding 34:10 Maintenance, Repairs, and Refits – Sustaining a Spacefaring Fleet 39:25 Salvage and Recycling 40:37 The Future of Orbital Shipyards – Expanding Beyond Earth 43:03 The Rise of Megastructure Shipyards 44:29 Privatization and the Spacefaring Economy 46:12 Shipyards as Strategic Military and Political Assets 47:54 The Role of AI, Automation, and Post-Human Workforces See Privacy Policy at https://art19.com/privacy [https://art19.com/privacy] and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info [https://art19.com/privacy#do-not-sell-my-info].

The Fermi Paradox asks why, in a vast and ancient universe, we see no signs of alien life. In this episode, we explore five explanations that make sense—and seven popular ones that, despite sounding good, fall flat under closer scrutiny. Join this channel to get access to perks: https://www.youtube.com/channel/UCZFipeZtQM5CKUjx6grh54g/join Visit our Website: http://www.isaacarthur.net Join Nebula: https://go.nebula.tv/isaacarthur Support us on Patreon: https://www.patreon.com/IsaacArthur Support us on Subscribestar: https://www.subscribestar.com/isaac-arthur Facebook Group: https://www.facebook.com/groups/1583992725237264/ Reddit: https://www.reddit.com/r/IsaacArthur/ Twitter: https://twitter.com/Isaac_A_Arthur on Twitter and RT our future content. SFIA Discord Server: https://discord.gg/53GAShE Credits: 5 Fermi Paradox Explanations I Love, 7 That Fall Flat Episode 502 / 721; May 31, 2025 Written, Produced & Narrated by: Isaac Arthur Graphics: Ken York YD Visual Select imagery/video supplied by Getty Images Music Courtesy of Epidemic Sound http://epidemicsound.com/creator 0:00 Intro 1:11 Space Is Too Big 4:46 Rare Earth 6:35 Aliens Signals Just Can’t Be Heard 10:09 Humans Are Boring 11:36 Dark Forest Theory 14:14 Interdiction Bubble Civilizations 16:49 Hermit Hypothesis 19:18 Aestivation Hypothesis and Extragalactic Migration 21:10 Transcendance, Ascension, and Extra-Universe Migration 22:33 Infinite Miniaturization 23:33 Berserkers & Zombie AI 24:53 Aliens Common But Unrecognizable 26:08 Simulation Hypothesis See Privacy Policy at https://art19.com/privacy [https://art19.com/privacy] and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info [https://art19.com/privacy#do-not-sell-my-info].