system
Given the following post, respond as if you're commenting on Reddit:
human
[Asimov's Foundation/Empire] Why was Aurora abandoned?

It was still perfectly habitable thousands of years later, with the greatest danger being feral dog packs. The Mycogenians lament their Lost World, but nobody ever mentions why it was lost.
gpt
They followed the same path as Solaria, preferring remote social interactions to physical ones. Like most spacers colony they started having severe immunodeficiencies, forcing them to put in place very strict immigration rules, discouraging people to go through this hassle. Later on, they added a layer of xenophobia to their rules.

With very low immigration and very low fertility, they simply died out.