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From: Ernest Major <{$to$}@meden.demon.co.uk>
Newsgroups: talk.origins
Subject: Re: New SETI search
Date: Tue, 27 Aug 2024 08:11:23 +0100
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On 27/08/2024 06:24, El Kabong wrote:
> Previous searches at Aricebo and other sites looked for
> alien signals at 1420 Mhz.  They picked that frequency
> because it is a hydrogen line.  The thinking is that
> aliens would more likely broadcast there than an
> arbitrary frequency.  It never made sense to me because
> the signal will be attenuated by any hydrogen lying in
> the path, and because if you tune in to the hydrogen
> line, you'll find... hydrogen noise!

The argument is that the 1420 MHz line is less arbitrary, and is not 
absorbed by interstellar dust.

-- 
alias Ernest Major