Wow! signal
In 2017, Antonio Paris, a teacher from Florida, proposed that the hydrogen cloud surrounding two comets, 266P/Christensen and 335P/Gibbs, now known to have been in the same region of the sky, could have caused the Wow! signal. This idea was dismissed by astronomers, including members of the original Big Ear research team, as the comets he suggested were not in the exact right spot at the correct time. Also, comets do not emit strongly at the frequencies that the signal was heard, and there is no explanation for why a comet would be observed in one feed horn but not in the other.