915
Someone's lying
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Just googled it now, and I'm seeing the "3 miles" number thrown around a lot.
https://science.howstuffworks.com/question198.htm
That's just weird. The question is about the eye. And the primary "answer" they give is about the geometry of our planet.
Edit: At least the real answer is somewhere further down in the text:
Light emitted farther than 46 billion light years away will never reach you. While traveling an infinite distance the universe expands faster, and light emitted not that far will get so red-shifted that it won't be visible anymore.