Where the gravitational effect is at the galactic level, the mathematics is again non-linear. But in this case the interactions involve 'three-way' effects between all nuclear matter, quarks, where the fields are the photonic compounds known as gluons. Such 'three-way' interactions are governed by SNSFT. In this case, these nuclear-nuclear forces are long-range 'tripole-tripole' interactions. At this level, the galaxy is balancing all the nuclear matter within it, namely the stars, planets, and all other nuclei within it. One major difference between the nuclear and galactic mathematics is the number of interacting elements. In atomic-nuclear interactions there may be as little as three quarks that interact, whereas there is a very large number of interacting elements wihtin a star or in a galaxy. Hence atomic-nuclei demonstrate the well-known 'quantum' physics, which can also be seen within galactic structures where the number of elements involved must be small, or small perhaps in that only few star-clusters exist within the structure. If inter nuclear forces do exist, then it is probable that the gluon 'strings' that connect the nuclear matter over large distances are converted into lower order photonic matter within the intervening millieu. centres of energy here, black holes, are centres of negative energy