re: NASA scientists look for advanced aliens in 100,000 galaxies - no evidence

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The idea is that given enough time or the development of a benevolent singularity a civilization can develop the ability to colonize an entire galaxy. Sounds crazy at first but IIRC the numbers say that with self replicating probes it would be possible to colonize the Milky Way in something like 100,000 years.

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Yeah but why the need to colonize the whole galaxy, when you can just colonize specific sectors. Plus what if they created an efficient way to travel between galaxies. They could colonize just the solar systems they want, across vast regions of space. The belief that advanced races would colonize whole galaxies is one of many theories.

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With an adversarial singularity the timeline could shorten. One of the real fears with developing a true AI is that entity will turn the galaxy into a big paperclip factory or similar (I am not making that up).

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Doesn't mean it would happen. Just another theory. It's very possible to create AI that will function to their specifications, without rebelling from their creators like some assume.