What makes Earth so gosh darn livable? How is it different from the other planets in our solar system, or viewable planets in our galaxy?
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This is a pretty huge example of selection bias. Earth is livable *for us* because evolved here, so of course it is. That’s kind of like asking why you like your house so much after you bought that house specifically because you like it. Livable is only meaningful if you consider who lives there. The deep oceans are unlivable for humans for other sea life thrives there.
Earth is unique in our solar system but that’s not really representative of anything. There are between 200 and 400 *billion* stars in our galaxy. We’ve surveyed an infinitesimal fraction of a percent of them, and we’re already finding Earth-like planets all over the place. Galactically speaking, there’s really nothing special about Earth. Statistically ,there are at least 300 million Earth-like planets in our galaxy, and probably many more than that.
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