It's estimated there are 100 to 400 billion stars in the Milky Way. That would equate to there potentially being 100 billion to 1.2 trillion Earth-sized planets in our galaxy alone. There are possibly 70 sextillion stars in the observable universe, so there could be as many as 70 to 210 sextillion Earth-sized planets in our universe! Of course we don't know the number but these are the best guesses with today's technology and research.

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Credit: Curiosity.com