Dear people, Fe'ers and RE'ers....
Actually the world is flat and has a triangular shape, it's not a disc, but FE'er are right about most things.
There is indeed an 'Ice' Wall, it consist of frozen CO2 (Dry Ice) and Uranium . I've seen this phenomenon myself.
Also, the reason why the government is hiding this is because there have been several UFO's crashing into the wall, and money of course.
The 'Discovery' of other live in the universe would create great chaos in the world so hiding this isn't a bad thing, but the Wall at the rim has an abundacy of Uranium and the world governments are mining this in secret Rim Platforms (RP's) at their side of the Wall.
There is more evidence about this theory then the Disc, because a triangle has more space for 'wind' to pass the sides.
This idea is very logical, because God created Earth and created the Holy trinity (also known as the holy triangle) in the shape of a triangle, so a triangular shape makes perfect sense! Some people believe that the North Pole, which is the Father part of the Trinity, is the House of God. Which also explains the Santa Claus Tradition.
I think this is a very plausible model.