Originally posted by Goatfell
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Even at well below sublight speed, an intelligence can colonise the galaxy in 50 million years in person or by machines.
The galaxy is roughly 12 - 13BY old. Our system, 4.9BY. So there's plenty of time for it to have happened. Many times. But it hasnt.
Intelligence isnt a given from the evolution of microbial life. It will be so rare that the chances of two intelligences co existing at the same time will be very rare.
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