Not really, it really only is assuming that an intelligent race has evolved before us, did not go extinct, and spread out from their solar system.That would be assuming they evolved at a similar rate to us though wouldn't it?
If you run the math of the Fermi Paradox, its actually rather fascinating. If it happens just once, a single species colonizing at an extremely modest rate of sublight travel could spread across the entire Milky Way in around 50 million years.
So a race with a 1 billion year head start on us could, using extremely conservative estimates of interstellar sublight travel and exponential population growth, colonize the entire Milky Way galaxy TWENTY times over.
Holy crap. That's still astounding to me, whenever I think about it, because it is hard to wrap ones head around 50 million years, let alone a billion. But the reasoning and the numbers make sense.
One of the reasons why I love Mass Effect is that it actively acknowledges the likely truth of the Paradox. The reason why the galaxy wasn't dominated and colonized by a single race (after the Leviathans) were because the Reapers extinguished all newcomer civilizations.
With Andromeda being twice the size and the age of the Milky Way, this would have to be addressed to make the story sensible. Technological advancement not proceeding at a rate equivalent to human advancement actually becomes meaningless when you consider the timescales involved.





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