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since the 60's, Venus, at 7.1(+) AU has been considered just inside the Goldilocks Zone by most scientists.
based upon solar flux and the luminosity of the stars which Exoplanents orbit, this can shrink to .5 AU.
not all suns are the same.
I believe that so-called "shakey paper" to be erroring too far on the side of caution.
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