• Question: How many planets do you think there are in the universe that are habitable?

    Asked by Jack Lewis to Samuel on 9 Nov 2018.
    • Photo: Samuel Bancroft

      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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