It’s really difficult to count them, just as hard as it would be to count all the grains of sand on a beach. Scientists think that our galaxy has around 1 x 10^10 stars (10,000,000,000) and that there are about the same number of galaxies in the universe as stars in our galaxy. So that would be 10,000,000,000 x 10,000,000,000 stars which is about 1,000,000,000,000,000,000,000 stars in total or 1 x 10^22. Some are too far away to be seen from Earth so we can’t just get pictures and count.
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