Martin 53N 1W wrote:

Linda wrote:

What's SETI looking for? ...

Very simply, any persistent signal that is recognisably 'artificial'.

It doesn't have to contain any message other than announcing its
existence. (God calling? (;-))

Along the way, we can expect to find a lot of natural EM-sources that
seem strange and so spur new science in studying them.

   Indeed, that's sort of how our knowledge of pulsars began....

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