The 'Fermi Paradox' we are alone the Universe then perhaps we are not.

 

• There are billions of stars in the Milky Way similar to the Sun.
• With high probability, some of these stars have Earth-like planets in a circumstellar habitable zone.
• Many of these stars, and hence their planets, are much older than the Sun. 
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• If the Earth is typical, some may have developed intelligent life long ago.
• Some of these civilizations may have developed interstellar travel, a step humans are investigating now. see Elon Musk
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• Even at the slow pace of currently envisioned interstellar travel, the Milky Way galaxy could be completely traversed in a few million years.
• And since many of the stars similar to the Sun are billions of years older, Earth should have already been visited by extraterrestrial civilizations, or at least their probes.
• However, much as we would like to TALK TO or not talk to an ET, there is no convincing evidence that this has happened.