We can’t see the stars because the sky is dark and taking good pictures of the sky requires some long exposure shot. This is also why when you randomly snap a picture of the sky you can’t always catch stars, even if you do see them.
When they do take [good enough pictures](https://eol.jsc.nasa.gov/DatabaseImages/ESC/small/ISS044/ISS044-E-45215.JPG), you can see a lot of stars.
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