From O’Neill cylinders to spiral habitats, discover how humanity might build colossal, interconnected cities high above Earth.

Watch my exclusive video The Economics of Immortality: https://nebula.tv/videos/isaacarthur–… 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=isa… Use the link https://gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $36. Visit our Website: http://www.isaacarthur.net Join Nebula: https://go.nebula.tv/isaacarthur Support us on Patreon: / isaacarthur Support us on Subscribestar: https://www.subscribestar.com/isaac-a… Facebook Group: / 1,583,992,725,237,264 Reddit: / isaacarthur Twitter: / isaac_a_arthur on Twitter and RT our future content. SFIA Discord Server: / discord Credits: Orbital Arcologies — Mega Cities in Space Written, Produced & Narrated by: Isaac Arthur Graphics: Bryan Versteeg, Jeremy Jozwik, Katie Byrne, Udo Schroeter Select imagery/video supplied by Getty Images Music Courtesy of Epidemic Sound http://epidemicsound.com/creator Chapters 0:00 Intro — The Conductor’s Tale 4:43 Why Megacities in Space? 6:02 The Four Foundational Assumptions of Space Habitat Design 10:11 Flawed Assumptions & Specialized Habitats 11:28 The Urban Web – Tethered Transit and Megacity Growth 17:14 Nebula 18:24 Spiral Habitats – A Rolled-Up City in Space 20:19 Density and Design – Population Scaling 23:17 Green Limits – CO₂, Heat, and Living Space 26:08 The Future of Orbital Urbanization – Terran Swarms and Beyond.
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=isa…
Use the link https://gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $36.

Visit our Website: http://www.isaacarthur.net.
Join Nebula: https://go.nebula.tv/isaacarthur.
Support us on Patreon: / isaacarthur.
Support us on Subscribestar: https://www.subscribestar.com/isaac-a…
Facebook Group: / 1583992725237264
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Twitter: / isaac_a_arthur on Twitter and RT our future content.
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Credits:
Orbital Arcologies — Mega Cities in Space.
Written, Produced & Narrated by: Isaac Arthur.
Graphics: Bryan Versteeg, Jeremy Jozwik, Katie Byrne, Udo Schroeter.
Select imagery/video supplied by Getty Images.
Music Courtesy of Epidemic Sound http://epidemicsound.com/creator.

Chapters.
0:00 Intro — The Conductor’s Tale.
4:43 Why Megacities in Space?
6:02 The Four Foundational Assumptions of Space Habitat Design.
10:11 Flawed Assumptions & Specialized Habitats.
11:28 The Urban Web – Tethered Transit and Megacity Growth.
17:14 Nebula.
18:24 Spiral Habitats – A Rolled-Up City in Space.
20:19 Density and Design – Population Scaling.
23:17 Green Limits – CO₂, Heat, and Living Space.
26:08 The Future of Orbital Urbanization – Terran Swarms and Beyond.