Quote:
Originally Posted by Slartibartfas
If we are not totally failing with our physical theories, there is only one likely answer: no
Its such a huge effort to conduct space travel, not only in terms of energy but also and that might be an even larger obstacle, in terms of time.
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That's true, unless the aliens moved in entire colonies as a whole nation rather than just as researchers. But than we're going into 100% speculation and imagination. But, yeah, when useing logic, want makes sense is that aliens almost certainly exsist, but it is nearly impossible for them to have come to Earth.