From: fortunati.luigi@gmail.com   
      
   Edward Prochak luned=EC 07/11/2022 alle ore 09:14:59 ha scritto:   
   >> If we let all the elevators in the world move freely (unhindered), they   
   >> would head towards the center of the Earth where they would all meet.   
   >>   
   >> If we rested a body anywhere else, it would invariably accelerate   
   >> towards the center of the Earth, and only if we rested it in the center   
   >> of the Earth would it remain stationary in its place.   
   >>   
   >> So there is no doubt that the center of the Earth is not the same as   
   >> all the other points but it is very special, because it is a center of   
   >> gravity (and the other points don't).   
   >   
   > Your question is unclear. What exactly do you mean by   
   > "not the same as all the other points"   
   >   
   > If I assume you mean "all the other points" in the universe,   
   >  then consider:   
   > "anywhere else then would include points near Mars for example.   
   > A body rested near Mars would accelerate toward the center of Mars, not   
   > Earth. Similar results would be obtained for any large body in the universe.   
   > So "all other points" is not true for the universe of points.   
   >   
   > If I assume you mean "all the other points" relative to the earth,   
   >  then consider   
   > Lagrange points that exist in the earth moon system. Ideally,   
   > if you rest a body at one of these points, then the object   
   > "would it remain stationary in its place" and is not accelerated   
   > toward the center of the earth.   
   >   
   > So I'm am merely trying to determine what you mean by saying   
   > that the center of the Earth is "very special". The phrase just isn't   
   > well defined as a physical property.   
      
   I mean that the center of the Earth is a particular (unique) point with   
   respect to all other points on the Earth (and not those of the Moon or   
   Mars).   
      
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