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Fourteen hundred years ago, the number of number of stars you can see without even a pair of binoculars would have been about 2100 at any one time. So until optics were invented, the total number of stars could not have been guessed.

With the telescope of Galileo the number of stars increased to about 28109. But, even at that was reallyjust a start.

Even with a big telescope telescopes on earth (like one at the Copenhagen University Observatory made in 1861 in Copenhagen, Denmark, you can't get a real idea of how many stars are out there. The air limits what you can see.

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Keywords: total number of stars in the universe
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