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yeah but who knows what type of communication devices are they using,mabe our communications to them look like stone age transmitters.One thing is why nasa cant find any transmitting signals in space,mabe they are using faster than light communication or something like that.
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that's true, but any alien arrival other than intentionally stealth arrivals, would mostlikely hit the headlines pretty quickly, and as for why nasa can't find any signals, space is big, plus there was the wow signal