Hello, SFIA audio listeners. In this month's Nebula exclusive, big alien theory,

we're asking the reason alien civilizations might be rare is because most aliens are huge.

To hear it and every episode early and add free, plus hours of bonus content,

check out go.nebola.tv slash Isaac Arthur and use my code, Isaac Arthur.

At some point, we're going to run out of the living room, so how can we use celestial,

circular innovation, to put humanities like a real estate in the rearview mirror?

Today we'll be looking at the Banks-Obril, an immense megastructure in the form of a ring-shaped

habitat, more than a million

miles in diameter, and depending on the ring's width, containing hundreds, if not thousands

of Earth's worth of living area, all enjoying more naturally Earth-like conditions than the other

rotating habitat design. We were talking about assembling a structure that makes all of

humanity's combined constructions

to date look like a toddler's sandcastle.

We'll be deep diving this structure, its engineering, why it's desirable, and what life

on it might be like.

So let's jump into the cosmic deep end and find out just what it takes to live in space's

answer to luxury living, spiced with a touch

of celestial extravagance.

Routating habitat megastructures have a lot going for them.

They let you pick your gravity and pressure and use way less material than a planet does

for creating a given amount of living space, and since they all spin gravity environments,

not mass generated, it's very easy for

...