Sam Wormley wrote in message ...
Rick Sobie wrote:

Lets suppose, that the moon, was a Dyson sphere, and its power unit failed,
and its orbit began to decay, then it would hit the earth.


Ref: http://scienceworld.wolfram.com/physics/Gravity.html
Ref: Hartle, "Gravity: An Introduction to Einstein's General Relativity", Addison
Wesley (2003)

"A few properties of the gravitational interaction that help explain when
gravity is important can already be seen from the gravitational force law

F_grav = G m_1 m_2 / r_12^2

o Gravity is a universal interaction in Newtonian theory between all mass, and,
since E = mc^2, in relativistic gravity between all forms of energy.


Newtonian Theory = Metaphysics. The fact that F_grav = G m_1 m_2 /
r_12^2
works well in non-relativistic speeds is purely accidental and
derivable from a mixture of empirical and metaphysical assumptions
using Euclidean geometry (Read the Principia.

Copernican and Ptolemaic systems are Kinematically equivalent. Wake
up.

o Gravity is unscreened. There are no negative gravitational charges to cancel
positive ones, and therefore it is not possible to shield (screen) the gravitational
interaction. Gravity is always attractive.


What is this "gravitational charge" thing? Harry Potter stuff?


o Gravity is a long-range interaction. The Newtonian force law ia a 1/r^2
interaction. There is no length scale that sets a range for gravitational
interactions as there is for the strong and weak interactions.

Action-at-a-distance is metaphysics. Someone must warn poor kids that
suffer in schools.

o Gravity is the weakest of the four fundamental interactions acting between
individual elementary particles at accessible energy scales. The ratio of
the gravitational attraction to the electromagnetic repulsion between two
protons separated by a distance r is

F_grav G m_p^2 / r^2 G m_p^2
-------- = -------------------- = ------------- ~ 10^-36
F_elec e^2 / (4 pi e_0 r^2) (e^2/4pi e_0)

where m_p is the mass of the proton and e is its charge.

Proton rocket?

These four facts explain a great deal about the role gravity plays in physical
phenomena. They explain, for example, why, [snip out distorted views of reality]

The above four postulation, no facts by no means, explain nothing.
They are sham. (Actually an alchemists' view of the world).