This was a pretty good explanation of infinite earth from a user on GLP
....
I love threads like this because they challenge the brain. OK ill attempt to come up with a workable hypothesis...
Supposing it was an infinate plane:
As you stand on earth and look down, you see a flat section of the plane, but as you look further out you come to the horizon, the point where the distance of that section of the plane is so far away that you no longer have a perpendicular perspective, but rather by comparison, your height Above the plane is now so miniscule as a percentage of the distance of the plane that you might as well be parallel to it.
Therefore when you look to the distance, you see a horizon. Looking down is like seeing the flat part of a knife, looking in the distance is like seeing the edge of a knife. Thats why we see a horizon on an infinate plane.
example:
suppose you are ther dot below, and the plane is below you
.
____
you see the flat part.
now look in the distance...you see the edge and the flat dissapears.
. ______
Thats what causes the horizon.
Now heres the magical part:
If the plane is infinate, the horizon should always be there no matter what.
So if you begin to go higher and higher, you will see a wider streatch of the flat plane, but the horizen will ALWAYS be there, in all different directions. And it will ALWAYS appear parallel to you.
If you get far enough away from the plane, it will look like a circle, because the edges are the horizon which are parallel to you can not break the infinate horizon and the flat part that is directly belowe you simply gets further away the higher you go. The circle will just appear to get smaller.
Thats why stars . Appear smaller than the moon and why we always see the same part of the moon and never the "Dark Side".
From this distance we merely see the flat section of the moon that we are directly above, and the edges are merely the ever extending infinate horizon that is parallel to us.
From this distance we merely see that as ROUND.