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This hypothesis was put forth by Paris Antonio in the paper "Hydrogen Clouds from Comets 266/P Christensen and P/2008 Y2 (Gibbs) are Candidates for the Source of the 1977 “WOW” Signal". As you correctly suspected, he tested his theory in 2017 leading to the paper "HYDROGEN LINE OBSERVATIONS OF COMETARY SPECTRA AT 1420 MHZ". In this paper he claimed to have ...

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