Quote:
Originally Posted by David Johnston2
More than a thousand if you set the bar low and just settle for liquid water. Actual breathable air without many centuries of terraforming? I suspect the number would be more like a hundred.
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Given that people are kicking around various possibilities, perhaps the OP would define "habitable" for the purposes of argument. Just-like-Earth, temperate zone? 100 degrees in the shade, requires supplemental oxygen, 1.75 G?