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Thanks for sharing this alternative to the Drake equation. 
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Sheng Ho's profile photoTed Driver's profile photoTaweechai Maklay's profile photoTom Nathe's profile photo
 
The major weakness with the Seager equation is that the planets have to be transiting - to our field of view. There is no accounting for non-transiting  systems, i.e. stellar wobble from gravitational tugging by a large planet.
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