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It is a well-known fact now that the sun is one of the multiple stars in the universe.

But in which year people at least hypothesized the fact that we are living in a universe with multiple stars?

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    $\begingroup$ Recognized? Does this mean "hypothesized," "found some evidence for," "found sufficient evidence that it was the most likely theory," or "had any of the prior things generally accepted among scientists"? $\endgroup$
    – Mary
    Aug 1 '20 at 15:14
  • $\begingroup$ @Mary thanks, updated... $\endgroup$
    – hanugm
    Aug 1 '20 at 15:29
  • $\begingroup$ This is kinda vague. People probably have known about stars since the same day they have known about the sun. Did you mean to ask, "when did we realize the the sun is also a star?" $\endgroup$
    – dryairship
    Aug 1 '20 at 15:33
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    $\begingroup$ Giordano Bruno deduced this from Copernican heliocentrism and got himself burned at the stake for his trouble. $\endgroup$
    – Spencer
    Aug 1 '20 at 22:50
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    $\begingroup$ Probably already the chimpanzee know that the Universe has multiple stars... $\endgroup$
    – peterh
    Aug 2 '20 at 9:47
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This belief is known as cosmic pluralism and was found among the ancient Greek philosophers:

After Anaximander opened the door to an infinite universe, a strong pluralist stance was adopted by the atomists, notably Leucippus, Democritus, and Epicurus.

Though this was the belief that stars had planets -- that is, were, like the sun, not just points of light but with satellites.

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