From: b5249-23@mathcs.sjsu.edu (Kurt Stocklmeir)
Newsgroups: sci.physics
Subject: Spin
Date: 28 Sep 92 22:17:35 GMT
Organization: San Jose State University - Math/CS Dept.

Robert Firth
 His article

Some other people have confused you.  Look at Gravitation
Misner, Thorne, Wheeler P.177.  There are also some other parts
of the book that include the area of gravity having an infinite
velocity.

Physics teachers give hours of homework problems to physics students and
because of that physics students do not ever have time to learn
anything about physics.  That explains why John Baez and others
do not know and can not figure out P.177.

The only thing that was meant on P.177 was that gravity travels
faster than the speed of light.  But in relativity, nothing
travels faster than the speed of light.  That means any gravity
moving faster than the speed of light does not fit into relativity.

For example, the direction of gravity from the sun to the Earth is
straight to the Earth.  The direction of light from the sun to the
Earth is not straight from the sun.  Therefore, gravity moves faster
than light.  The Earth orbits the sun.  The Earth does not orbit
the place where light from the sun is coming from.  If it tried, the Earth
could not orbit the sun.  The same is true for galaxies.  Stars
orbit the same place in a galaxy.  This is associated with a center of
mass.  I do not think I need to tell you how long it takes light
to travel through a galaxy.  If gravity travels at the speed of light
there would not be any stars in a galaxy.  If there were any stars,
they would all be orbiting different places.

But all this can not fit into relativity.  Relativity says that mass
changes the shape of spacetime and that causes gravity.  If the mass
moves to a new place in spacetime, then spacetime will change shape
with a new center of mass where the mass has moved.  That change
in spacetime is called a gravity wave and is suppose to move at c.
Therefore some people state that there are 2 components of gravity.
A static part that has an infinite velocity and a changing part that
moves a c.  But until the changing part travels to a particle a large
distance away, the particle will think spacetime is still the same
and will be attracted to the old center of mass.  I did not include
here that particles at different speeds will think there are different
amount of space between them.  Since gravity decreases by 1/rr, 
particles with different speeds will think there are different
amount of gravity.

Paul Davies said that imaginary forces have an infinite velocity.
If particles start orbiting each other because of gravity, and the
imaginary forces have an infinite velocity, then all parts of
gravity have an infinite velocity.

Theories state that if particles are orbiting each other, and if gravity
does not have an infinite velcoity, then angular momentum can not be
conserved.  This is because they are in a rotating system and a torque
would be created.

Gravity that is observed can not fit into relativity.  That is what
is meant on P.177.  There are also other problems.  Inertia is a
problem.  People explain inertia using the idea that gravity has
an infinite velocity.  Again Superforce Paul Davies P. 215  Attraction
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