At least none that the people at SETI have been able to find.
Since 1963 there have been people looking to the heavens searching for ET. The only nibble came from the Ohio State University SETI program on August 15, 1977 when project volunteer Jerry Ehman saw a strong signal received by the telescope. This is considered by some to be the best candidate for a radio signal from an artificial, extraterrestrial source ever, but it has not been detected again in several additional searches
With all the newly discovered exoplanets that are in the Goldilocks zone (i.e. habitable), scientists are concentrating their searches at those points. Alas, nothing has been found.
I don’t expect them to give up on ET so easily. You have to remember that we have only been looking for a short period of time as far as the Universe is concerned. Also, the amount of radiation and other unknowns in interstellar space have not been determined. We have only just managed to leave our own solar system after about 35 years of space travel time.
It is also possible, that ET doesn’t play or communicate in the spectra that we are looking at. Or that they communicate the same way that we do at all.
– Ex astris, scientia –
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