On 5 Nov 2005 09:02:33 -0800, "mazafaka" wrote:

tell me, if we hace a glass sphere with a diameter
of earth, empty inside, then the gravity at this
glass spehere will be the same as it is on earth,

According to Newton, NO!

According to General Relativity, I don't think so.

According to a fool like me who thinks matter expands,
yes, for a small particle, the surface gravity would be the same.

But the sphere would be many times less massive than
the Earth, so according to the expanding matter of the
Electrodynamic Divergence of Matter model, then any
object having substantial mass touching the sphere would
resist being accelerated away from the center of mass of
the glass sphere, and push it backwards until the center
of mass of the two objects would be the center of expansion,
and the surface gravity on the surface of the glass sphere
would vary, being greater on the side away from the other
object, and less on the side touching the other object,
possibly even being zero there, or even negative.

am i cool?

In Spain? Maybe cool, maybe comfortable, but
not hot or cold, except maybe on a mountain top.

Joe Fischer