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I think it is kind of odd to assume that all the life out in the universe is less advanced than us.
There are probably alien races out there much more advanced than us, maybe some resistant to cosmic radiation.
And there is also the chance that Einstein was wrong about not being able to travel faster than the speed of light.
If there is intelligent life in our galaxy, maybe they'll send colonists here or researchers here.
We'll try to colonize other star systems eventually, probably in the next few hundred years. I expect withing the next 300-400 years for us to start colonizing the solar system, and after that to start exploring past it.
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