Air is not perfectly transparent. One cannot see forever, despite of one's "line of sight." See also diffraction.
O god that is the funniest thing I have ever read.
"One cannot see forever"
So what your saying is that after so much of a distance there is just a invisble wall that you cant see pass.
Eg you cant see pass 5ft....that would be so much fun to play hide and seek....all you would have to do is stand outside of the persons line of sight.
Idoit.
You can see "forever" so long as there are no objects in your way.
Yes, you can see Jupitar for instance with your nake eye. Just because you cant make it out other than a brighter "star" in the night sky doesnt mean the information is stored in your head as to what you are looking at.
Im not meaning that you can look at Mars and see little green men on the planet and be able to see them. But if you was to look without the reflection of the sunlight then the information would be stored in your head.
And if you was able to unlock the information you would understand.(and no, no-one has unlock the information we use less than a 3rd of our brains)
And actualy air is completely transparent. The reason why you cant stand at somewhere high up and look over to see the tallest mountain in the world is because the earth is Oval....
When you look out and see the horzion...its not because some invisble wall is there stopping you see any farer away but because that is the horzion....
It is better to see at night.
You look out to the hozion at night and on a clear night you will look pass the horzion and out into space.
Proving both my points you can look "forever" and there is a horzion.