Thank you for the reply, the forum you mentioned has banned me for wanting to discuss this topic, they said I insulted members which I did not.
I saw those posts. I didn't realise they'd banned you, but you did deserve it. Anyway, this is a different forum, and another chance for you.
Straight to the point , I do not see how the answer is no when obviously the space is not dark and obviously we can see the entirety of the clear line of sight between any objects.
In a "clear line of sight" you are not seeing anything at all between you and the distant object. You don't see the distance, you see the object.
Have you ever seen a movie where a valuable item is secured by lasers to detect thieves? You can't see the lasers from the side. The hero has to spray something into the air, or blow dust into it, so that some of the laser light is reflected to his or her eyes (and ours, via the movie screen).
When you see something, you are reacting to light that left the object, from wherever it is, and which has traveled the distance between you and that object, until it hits the retina in the back of your eye. You are not "seeing the distance" between you and that object.
You seem to be imagining some "magic" in the ray of light.
If we consider y-axis is the light that enters your eye, then why can I also see a distance apart of anything on the horizon x-axis if I am not seeing light in that space between the horizon objects?
I really can't parse that.
I can ''see'' there is air a foot away from me? (notice ''see'' does not actually mean see as the air is transparent and ''invisible'')
No, you can't see that air. You know it's there, but what you're seeing is an object some distance away from you, light is travelling (at finite speed) from that object, through the air, to your eye.
Imagine the Sun has a switch, and it's off. Everything is dark.
Now the switch is turned on. Everything is still
After 4 minutes, light from our Sun is rushing towards Earth (and the rest of the Universe); the space halfway from Earth to the Sun is full of photons.
But for you, everything is still
You can't see the light that's halfway from the Sun to you
After 8 minutes, that light starts to reach you, it enters your eyes, and now
your brain can tell you "the Sun is back on".
(And you'd know that it was turned on, 8 minutes ago).
Edited by pzkpfw, 15 June 2016 - 01:08 AM.