From my understanding.
1. The Earth is flat surrounded my an Ice Wall that can not be broken by earthquakes and the wall never melts.
2. The Ice Wall is surrounded by an army of a few hundred people to keep this information on the inside.
3. The Earth is the only planet that is flat. All other planets in our solar system are spherical. Asteroids are spherical, everything but earth is spherical.
4. The entire galaxy and universe travels up at 1g (9.8m/s-2) along with every star, sun and moon in the universe. This produces the same effect as gravity. How do asteroids hit our planet if everything is moving up?
5. Satellites and GPS does not exist. This is done through radio towers. Even though this site explains how GPS works
http://www.nasm.si.edu/gps/work.html6. The reason the government is hiding this from the people is money even though the government can print money at will.
7. Every government on the planet is keeping this secret from the masses but yet they go to war. If I was head of a government I would threaten to expose the secret if threatened with war.
The thing that really gets me though is all the other planets in the galaxy are spherical except for Earth which is flat.