About 6000 to 8000 stars in the Milky Way Galaxy; 6 planets, including Earth; Earth’s moon; occasional comets and meteors; and with good eyesight and a clear sky, the smudge of light that is the Andromeda galaxy.
If you want that as a percentage, call it one-quintillionth of the total. Close enough.
Theoretically, its all visible — the light is getting to our eye, but its too dim to be seen. It’s pretty much a neglible portion of the universe. Here are some bits about human optics — our eyes are actually fairly remarkable, which is why, with proper equipment, they can see the majority of the universe, as well as absurdly tiny objects.
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