That depends on how clearly you want to see something and how much atmosphere is in the way. The molecules in our atmosphere tend to scatter light, giving distant object the appearance of being blue. So, you may be looking at a mountain several hundred miles away and notice that it appears blue.
On Earth, the horizon that we see depends on how high we are above the earth. The taller you are, the farther you can see across the ocean.
When away from Earth, we can easily see stars within our own galaxy, but more distant objects appear too dim to register on our retinas without the aid of a telescope.
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