Edwin Hubble was the first person to realise that everything in the universe is moving away from us (red-shifted). This fact is now universally accepted by the cosmology community.
Everything in every direction is getting further away. In round Earth theory, this can only mean one thing - our little globe is the centre of the universe. I think most will agree this is ridiculous, or so unlikely that it be dismissed as a realistic explanation.
Now, in Infinite Earth Theory (IET) this all makes perfect sense. IET states that Earth is a flat plain making up the floor of the universe. The big bang was an event at the bottom of the universe, projecting all matter upwards. This energy continues today, as observed by red-shift. Only heavy elements have fallen to create the Earth, as well as lighter elements produced on Earth itself (the atmosphere).
Of course, this is only an idea of what happened at the beginning of the universe. Much more research is needed.
Ha. Ha ha ha. Ridiculous.
Pick
any point in the universe, and it will appear that everything is moving away from
that point. So the Martians can use this same principle to conclude that
they are at the centre of the universe!
This does not prove a flat Earth.