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BFT3K nailed it succinctly.
In any event, not only is it a mathematical certainty that other life will exist, it is a certainty that a percent have achieved intelligence equal to humankind and a percent far superior.
It?s too small minded and arrogant to refuse that probability simply because of our own species current limitations, where everything considered, answering that question is beyond humankind's current abilities unless it's kindly dropped in our laps.
No evidence (or lack thereof) gathered to date by humans (considering the primitive tools at our disposal in relation to the task at hand) to answer our own question alter the mathematical certainties at all. And whilst humans attempt to answer the ?are we alone? question, we are without doubt an isolated species, sat in a (best guess known to humans currently regarding observable universe) 93 billion light year diameter dark room, with essentially a lit match, restrictive spectacles and an ineffective ear trumpet.
A technologically superior race/entity (who we will naturally assume for the purposes of this thread is capable of the required travel by whatever means) sufficiently fast enough, have exactly the same reason and motivation to visit humankind right now that you yourself have to leave your home with the sole purpose of visiting a tiny anthill deep in the Australian outback.
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