Way back in 1963 the late Donald Barber the last professional astronomer at NLO believed there was life in the Venusian atmosphere. By his observations of bacterial growth on his photographic plates which coincided with inferior conjunctions of Venus he deduced these organisms had been blown to us by the solar wind. He even sent the bacteria away for analysis, which were unable to be identified! Article here:
http://shadetreephysics.com/Barber%201963.htm
David