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Q&A What's the minimum time that it would take for an advanced species to create an ecumenopolis?

In figuring out the rough timeline for my sci-fi, I've run into an interesting dilemma. As it stands right now, There are about 90 years in between one of my civilizations discovering space travel ...

2 answers  ·  posted 5y ago by greenmaster‭  ·  last activity 5y ago by greenmaster‭

Question planets population science-fiction