(this message does not have the purpose of ridiculing you but just some questions and some points)
Does a flat earth have a core and if no , proof please.
then if you go to a beach or go to a tower and you will see a little farther but you won't see the other side of the world
and lastly would nasa go through all the trouble to make a working spaceship and the proper documents just to convince everyone the earth is a sphere and furthermore why would they try to hide it from us in the first place ?
thx btw