Daniel Pitts writes:
Well... I would say that it is obvious, otherwise you'd be able to see
mountains, tall buildings, and other such things from much, much
farther away.

Not really, because perspective would make them appear smaller and
smaller over a distance until they are no longer visible.

And in practice it often seems to be haze that ends up doing the job.

-Miles

--
Laughter, n. An interior convulsion, producing a distortion of the features
and accompanied by inarticulate noises. It is infectious and, though
intermittent, incurable.