What is Spin Gravity, and why is it important?
Scientists are familiar with the concept of Gravity, the attraction between two masses, as established by Isaac Newton at the beginning of modern science.
But there is another sort of Gravity which is much less familiar. Newtonian gravity can be called Mass Gravity, as it describes forces between masses. The less familiar form of gravity can be called Spin Gravity, as it relates to forces between bodies which are rotating relative to each other. Newtonian gravity does not consider such forces.
Generally, the effects of Mass Gravity are much more noticed in observing the world. This is partly because we notice more about things which are closer to us (where mass gravity tends to dominate), and partly because Spin Gravity is a weaker force which only tends to show up at extremes.
So, in understanding our Solar System, Mass Gravity explains why the planets occupy the positions they do, they are at positions where their orbital speeds and forces from the Sun's gravitation balance out. But Mass Gravity does not explain how these positions were arrived at, for that you need Spin Gravity.
Proposition LT210396-P1.
First, let's look at an empirical equation which describes Spin Gravity -- don't worry about its details at this stage. The different symbols are explained in BS806: Mass Gravity and Spin Gravity: Adjusting the Universe.
The Spin Gravity equation
The symbol of most interest here is "d", the distance between the two bodies concerned. Notice that "F", the force between the bodies, is equal to various factors over "d", that means that the force is inversely proportional to the separation distance.
This formula is somewhat similar to that for Mass Gravity, but there is one big difference -- for mass gravity the force is inversely proportional to the square of the separation distance.
The outcome of this difference is profound. It means that the Mass Gravity which determines the equilibrium positions of celestial bodies is most effective with closer and more massive bodies, but falls away much more quickly with distance than does spin gravity.
In most instances of spin gravity acting between two bodies, the effect is for each of the bodies to move to transfer some of its own direction and speed of rotation onto the other body.
Thus, the Sun has moved all the planets from more random orbits into ones closer to its own plane of rotation. Spin gravity from the AGN at the centre of each galaxy has shaped older galaxies into disc-like shapes, with the disc axis of rotation coinciding with that of the AGN. Spin gravity has made the particles forming Saturn's rings to orbit exactly in Saturn's equatorial plane.
When the rotation of stars within our galaxy us concerned, as in the following graphic, the relative interactions of mass and spin gravity are demonstrated nicely.
Measured shift between inner and outer stellar motions.
On the curves, the yellow dots are measurements from the visible light emitted from stars, while blue dots represent measurements from the 21-centimetre line in stellar spectra. It can be clearly seen how the early and medium yellow dots lie on a curve, while the later yellow dots and the blue dots lie on a straight line.
This is because the yellow-dot curve largely derives from mass gravity, which has its force falling away with the inverse square of distance, and so giving a curve. The straight-line curve derives from spin gravity, much weaker than mass gravity, but falling away with inverse distance, more slowly, and giving a linear outcome.
Incidentally, the "turnover" point on the plot, at about R=12 (this is about 12,000 light-years out from the centre of a galaxy with a radius of about 50,000 light years) means that some of the constants in the spin-gravity equation can be calculated from the corresponding mass-gravity equation.
Also, the dashed line below the main curve represents the expected results if the Galaxy did not contain about 90% "dark matter". Dark Matter is explained in LT251119: What is Dark Matter? .
Spin Gravity figures in Einstein's General Theory of Relativity, where it may be called Frame Dragging, and was one of Einstein's main modifications from his earlier theory, called Special Relativity.
Item: LT210306
Perth, Western Australia.
Last update 2026 Jan 1.
s