Please - we are nowhere near getting off this planet - we can't even sustain a small Bio-Dome, let alone terraform Mars, we can't produce effective radiation shields (that we can power) to protect the colony, and we can't launch large payloads into space.
The failure of the shuttle program has demonstrated just how far we would need to go, and that's before we ever even talk about getting out the Solar System. Unless something changes in our fundamental understanding of Physics we've basically established that FTL is impossible.
That's why we haven't been visited by Aliens, they can't get off their own planets.
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