Quote:
Originally Posted by MS Fowler
OK, so its not one of a kind unique. It is a relative rarity in space. What % of all planets are earth-like?
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Just because we haven't found them yet, that doesn't mean they are not out there. I cannot remember which astrophysicist said it, but the recent estimated probability of having earth-like planet just in the Milky Way itself is approximately 100 billion planets.