Samuel Bancroft
answered on 9 Nov 2018:
last edited 9 Nov 2018 3:44 pm
In our galaxy there are about 11 billion Earth-like planets that are also orbiting in the habitable zone of a Sun-like star (this is actually quite an old low estimate – probably much better than this!).
There are about 500 billion galaxies in the Universe. That makes my guess to be five sextillion five hundred quintillion habitable planets in existence 🙂
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