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« on: October 12, 2017, 01:12:02 PM »
One compelling argument is center of gravity. The force of attraction (gravity) between two objects depends on their mass and the distance between them. Simply said, gravity will pull toward the center of mass of the objects. To find the center of mass, you have to examine the object. Since a sphere has a consistent shape, no matter where on it you stand, you have exactly the same amount of sphere under you, i.e. same distance to the center of mass.
Now consider a flat plane, the center of mass of a flat plane is in its center (more or less), and the force of gravity will pull a person toward the middle of the plain. That means that if you stand on the edge of the plane, gravity will be pulling you toward the middle, not straight down like you usually experience.
I have never been to Australia, but I am pretty sure that when a person drops an object, it does not fall toward the center of the flat plane.