The light from the sun can not travel through all of the air to reach the other side of the Earth. Sort of like how you see far away things start to get hazy and then disappear. Air is not perfectly transparent.
We are talking about the sun here, not a flashlight. It's light cannot be stopped by some air. You are obviously not very intelligent.
Light is light, whether it comes from a flashlight or the sun. A brighter light will go farther, but still can not go infinitely through the air. The Sun's light can travel roughly half way across the Earth.
I find it pretty funny that you say the sun light gets blocked from the air. So you said the stars are closer to us in FET but still behind the sun. The suns light witch is closer cannot travel through the air but the stars light witch is farther out then sun can magically make it through the air? Could I please see your math to how much did the light slow down? At witch distance from the sun it started to fade? Another thing is that earth it self emits light. So if the air was to thick for sun light to go through you would think weak earth light wouldn't make it through either?
Lets look at some light sources. First we got a light witch might be in your living room. Just a bulb sticking out the socket nothing covering it's sides. The ENTIRE room will light up, and lets say you have your door open, some light will escape the room into another room. So as you can see the light did travel farther out then my room. Second source would be a flashlight, witch acts as a spotlight(Witch is what FET describes the sun).
For proof that the earths air is not stopping the light, is simply by looking at the sky, if you see anything at all it means there is light(Night time we actually do see sun light, we see it hit the moon and we see the light from stars far away). If 0 amount of like was coming through then all you would see is pitch black. Light plays a role in what we can see and the colors we see. If the air was indeed to thick then night time would also look very foggy.
Another thing is lets compare glass and air. Light can go through glass witch is more dense then air, even the night time light form the stars make it through my windows.
Another thing that baffles me, is that FET thinks the stars and earth are closer? You even know what a star is? A star is a big burning ball of mostly hydrogen and helium. You ever been near a fire? It gets hot when you are near, as the fire burn temperature near it increase also(As long as it's still burning). So having the stars and sun closer to earth like in FET would create a major heat problem.