I think current theory is hydrogen clouds https://arxiv.org/pdf/2508.10657

Which sounds like swamp gas in space, but what do I know.

There is a book that talks about this, and many other things related to SETI.

https://www.amazon.com/Elusive-Wow-Searching-Extraterrestria...

Four dozen + 1 = 7^2 years ago, our fathers received a signal...

Not sure if you're sarcastic but it's the starting point of the Three body problem.