Allopatric speciation. Small isolated groups are the origin of new species.
Before that happens: there are no relays to Andromeda so I suppose the voyage will take generations to complete. The problems to communicate and maintain contact are clear. Any instructions from this galaxy are useless if they arrive two generations later. I doubt the people who were born aboard will keep a close emotional link to our galaxy. They'll be strangers to us.
Even worse with people born in the other galaxy. Their interests will no longer be our interests. What do they care if some people have problems in another galaxy? And why do those people try to control the way they do things?
There needs to be a method to maintain two things as they are now:
- The genetic makeup of the species. So they don't diverge too much and become too hard to relate to and interact with. But it's impossible to fill up planets and planets that way unless new members of the species are bred specifically with that purpose in mind.
- The emotional link to the old home. This has never been achieved. Americans don't miss Europe. The longing for home should have to be implanted onto their minds somehow.
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I didn't come up with any of this. It's the main theme of Hugo winner novel Cyteen by CJ Cherryh. It's about space colonization and the human diaspora.




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