The concept of pushing gravity was introduced by

Fatio and Lesage around the time of Newton. They postulated that space is permeated with ultra-small, ultra-numerous, ultra-fast gravitons, which bounce off of masses like perfectly resilient spheres; and masses accelerate toward one another because they shield each other from the background of gravitons. They mistakenly believed that two perfect spherical mirrors in a uniformly white room would look slightly darker to each other than the rest of the room. That was the main flaw in their model. A later attempt to fix the model presumed that a fraction of the gravitons are absorbed, while the rest are scattered. The problem with that is that the amount of energy absorbed would be equivalent to the mass of the particle every picosecond. No reasonable mechanism was offered to explain what becomes of that energy. Pushing gravity is discussed extensively at the late Tom VanFlandern's

*metaresearch.org*.

Today, the question of the cause of gravity is simply not asked in "respectable" circles. Minkowski space-time defines the path of light as a straght line, and since gravity affects light, space-time is warped. Most scientists now claim that gravity is caused by the warp of space-time, which is like saying that mountains are caused by the elevation lines on a topographic map. A mathematical description of an effect is not the cause of the effect.

The modern standard gravity formula is based on Newton's shell theorem. For points

**outside** an empty uniform hollow spherical shell, gravity is equal to the gravity of an equivalent point mass at the center of the sphere. As you go farther outside the sphere, the gravity decreases according to the inverse square of distance from the center. For points

**inside** the hollow shell, gravity is zero.

Since a solid sphere consists of concentric shells, the gravity inside the solid sphere at radius

*a* is equal to the gravity of a point mass at the center, having as much mass as all of the shells inside radius

*a*.

If the density of Earth were constant, the gravity inside would follow a straight line graph with zero gravity at the center and 1 g at the surface. Beyond that, it decreases as the inverse square of radius. Since the Earth is denser in the center, however, the graph is not a straight line; instead, it is steeper near the center.

Mathematical derivation of this graph.