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In the observable UNiverse there are somewhere in the order of 1011 galaxies, a typical galaxy might have 1011 stars, and it seems likely that most stars have planets and would therefore qualify as "solar systems". That makes for a total of roughly 1022 stars or solar systems (that is a one, followed by 22 zeroes), just in the observable Universe. Note that the total Universe is probably much larger, but it isn't currently know how much larger. All of the above are rough estimates, of course.

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13y ago

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