Hi dontbelievetheflies,

I too have been thinking about this recently - a lot of these threads here have a very good supporting arguments and my current "beliefs" only come from what I've been told in life. In regards to your sky theory I can think of only 2 possible theories (although I'm willing to hear others )
-From looking at maps I can see there is a lot of water on the earth. I suspect the sky may be reflective which is showing the same color as the sea - I live by the ocean and don't get out of town a whole lot so this is where I base the theory.
-Alternatively we know that water turns into steam when heated (I've seen this from boiling water in my kitchen) so potentially, the sky is like an ocean of evaporated sea water above the earth!

But back to my post - another question that interests me is if we have any idea how deep the earth is?

Any answers would be greatly appreciated