Hello, SFIA audio listeners, in this month's Nebula exclusive, Big Alien Theory,

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

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

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

Welcome to the Civilizations at the End of Time series.

Most the series on this channel have some defining aspect, and many of the ones I've done

these introductions for so far here on our audio-only inventory were part of what

originally shaped the channel or extensions on those earliest

episodes. Civilizations at the end of time is a bit different. Its first two installments,

Black Whore Farming and Iron Stars, which are also its chronologically last ones, in terms

of when they discuss, have long been the two most viewed episodes on SFIA.

So in that regard, they are what most define the show to most viewers, as they're the two

the most folks have seen.

This was very unintentional since the original video, Black Hole Farming, was more of the

culmination of a handful of prior videos taken in combination

to an extreme conclusion at a time so distant the future it makes all the time since

the Big Bang look like less than an eye blink.

It was not and never was intended to be a video people watched without seeing those other

episodes, and I figured on it receiving few views,

though I discussed most of the core concepts needed for the episode in at least brief detail

there.

With that in mind, it might benefit the listener to go through those other episodes first,

...