The ESO 137-001 jelly fish galaxy leaving tendrils behind by joining the local Galaxy Cluster, due to Mass Less Dark Matter Black Hole density and dual Gravity differences. (Q-FFF Theory interpretation of "ram pressure stripping").
Dark Matter Black Hole Density differences and external cluster Gravity forces, seem to be the origin of the instability of stars and local galaxy black holes at the back side of the Galaxy ESO 137-001 The infinite speed of Gravity forces suggestion was first done by Tom van Flandern.
Le Sage's theory of gravitation and the speed of gravity
The origin: of Gravity a net imbalance in the pressure exerted by the impact of corpuscles on the bodies, tending to drive the bodies together. This mechanical explanation for gravity never gained widespread acceptance.
see: Emergent Gravity by Dipole Repeller Rigid String Pressure the Origin of Quantum Gravity and Non Inertial Black Holes.
AND: What is Wrong with Current Physics to Explain Ball Lightning
Wikipedia:
Le Sage discussed the theory in great detail and he proposed quantitative estimates for some of the theory's parameters.
XX He called the gravitational particles ultra mundane corpuscles, because he supposed them to originate beyond our known universe. The distribution of the ultra mundane flux is isotropic and the laws of its propagation are very similar to that of light.
XX Le Sage argued that no gravitational force would arise if the matter-particle-collisions are perfectly elastic . So he proposed that the particles and the basic constituents of matter are "absolutely hard" and asserted that this implies a complicated form of interaction, completely inelastic in the direction normal to the surface of the ordinary matter, and perfectly elastic in the direction tangential to the surface. He then commented that this implies the mean speed of scattered particles is 2/3 of their incident speed. To avoid inelastic collisions between the particles, he supposed that their diameter is very small relative to their mutual distance.
XX That resistance of the flux is proportional to uv (where v is the velocity of the particles and u that of gross matter) and gravity is proportional to v2, so the ratio resistance/gravity can be made arbitrarily small by increasing v. Therefore, he suggested that the ultra mundane corpuscles might move at the speed of light, but after further consideration he adjusted this to 105 times the speed of light.
XX To maintain mass proportionality, ordinary matter consists of cage-like structures, in which their diameter is only the 107th part of their mutual distance. Also the "bars", which constitute the cages, were small (around 1020 times as long as thick) relative to the dimensions of the cages, so the particles can travel through them nearly unhindered.
XX Le Sage also attempted to use the shadowing mechanism to account for the forces of cohesion, and for forces of different strengths, by positing the existence of multiple species of ultra mundane corpuscles of different sizes, as illustrated in Figure 9.
The magic Herbig Haro Dual Black Hole system seem the basic origin of ESO 137 001.
Massless Dark Matter Black Holes with comparable gravity effects in merging clusters.in galaxy clusters. below:
The ABELL 520 Cluster Merging is a Support for the New Paradigm of Massless Dark Matter Black Hole systems, creating Hot Gas in the Center accelerated out of the three galaxies by the new paradigm of (dual) vacuum pressure Gravity on the massless black holes.