Text Box: The motion of the nine planets of the solar system over time scales approaching its 4.6-billion-year age is a classic n-body problem, where n = 10 with the Sun included. The question of whether or not the solar system is ultimately stable – whether the current configuration of the planets will be maintained indefinitely under their mutual perturbations, or whether one or another planet will eventually be lost from the system or otherwise have its orbit drastically altered – is a long-standing one...
THE n-BODY PROBLEM, Encyclopedia Britannica 2000
Text Box: The long-time stability of natural satellites under perturbations

The solar-wind mass particles are sustained by the countergravitational field of the Sun (see The Sun, link below). 
The photons and neutrinos associated with the origin of these mass particles are the source of the repulsive field; which field goes also to contribute to the CMB in the long range. 
In the short range, however, the speed-c and sub-c particles alike contribute to the Sun’s countergravitational effect on planets. It is this propitious effect that has kept planet Earth safely at bay from the solar inferno and given time for the evolution of man. 
We are now oblivious to the countergravitational influence of the Sun. It is little wonder, therefore, that the long-time stability of the solar system should still be a great mystery to physicists. Questions that are related to this stability of the ages remain unanswered to date. The questions involve a fundamental unsolved problem of celestial mechanics and also of dynamics: whether or not some characteristics of unperturbed, highly idealized elliptic orbits will survive slight perturbations that last for a long time. Gravitational forces are not the only effects influencing the orbits of the members of the solar system. Atmospheric drag, radiation pressure, and others must be considered as well. These forces are negligible at any instant, but their cumulative action for several billions of years may influence planetary motion significantly.

Consider the Earth under a perturbative outward pull. This tends to take the Earth away from the Sun. 
The gravitational tug on the Earth is in opposition here to the perturbative effect. 
Thus, when the perturbative effect wanes, the tendency will be for the Earth to return to its earlier stable orbit. 
(It cannot be ruled out, though, that the Earth could remain at the higher orbit with a change in orbital speed, 
or even leave its orbit altogether and drift out of solar space. Fortunately, the pull of the Sun has been sufficient 
to let the latter not happen, at least to those planets that survive today in the solar system.) 

Consider next the Earth under a perturbative inward pull. Both the gravitational and perturbative forces are now in the 
same direction. This can easily become a run-away effect. The Earth here experiences a greater gravitational pull 
from the closer Sun. Under this unrelenting and increased inward tug, the Earth has no way of returning to its outer 
stable orbit even if the inward perturbative effect should now completely cease.
(True, the Earth could remain in the lower orbit with the required speed change and synchronism with the rest of the system; but such coincidences over the eons may be totally ruled out.) 

And this is where the (also increased) countergravitational field of the Sun comes in beautifully to give the Earth
the required gentle radial boost and staying power against an inward spiral.
Thus, the long-sought answer to the long-time stability of the solar system is, literally – blowing in the solar wind.
To corroborate this fact, in the next box is a letter to Nature.
Text Box: The surface layer of the Earth, from 50 to 100 kilometres (31 to 62 miles) thick, is assumed to be composed of a set of large and small plates, which together constitute the rigid lithosphere. The lithosphere rests on and slides over an underlying, weaker layer of partially molten rock known as the asthenosphere. The constituent lithospheric plates move across the Earth's surface, driven by forces as yet not fully agreed upon, and interact along their boundaries, diverging, converging, or slipping past each other (Figure 1 [not reproduced here]). While the interiors of the plates are presumed to remain essentially undeformed, their boundaries are the sites of many of the principal processes that shape the terrestrial surface, including earthquakes, volcanism, and orogeny (i.e., the deformation that builds mountain ranges). ...
PRINCIPLES OF PLATE TECTONICS, Encyclopædia Britannica 2000
Text Box: A Prediction & Test on Antigravity
Please see section in Superconductivity under this caption
      Go back to Part 1 of 2
A Synopsis The Cosmos The Spin
ADDENDA The Cosmological Redshift The Neutrino
Two-Slit Tests The Galaxy Nuclear Reactions
NASA Tests Gravity The Sun
KamLAND Test Anti-Gravity The Pulsar
UCLA Test Relativity Superconductivity
Q and A Mass-Energy Fusion Energy
 Eugene Sittampalam
 12 November 2007