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This question already has an answer here:

I mean a total number of stars, not the only ones that we can see.

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marked as duplicate by Chappo Says Reinstate Monica, Jan Doggen, Mike G, Carl Witthoft, Glorfindel Nov 19 '18 at 21:11

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  • $\begingroup$ We don't know how big the universe is, so your question is currently unanswerable. But we suspect from curvature measurements that the universe is infinite in size, and if that's the case, the number of stars is also infinite. $\endgroup$ – PM 2Ring Nov 19 '18 at 5:15
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    $\begingroup$ You might ask, what is the count of the stars in the visible Universe. Roughly 1 mol. $\endgroup$ – peterh says reinstate Monica Nov 19 '18 at 5:22
  • $\begingroup$ You also might want to consider simultenaity or lack thereof. Lots of stars we "see" don't exist any more. $\endgroup$ – Carl Witthoft Nov 19 '18 at 20:11

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