We exist in a fractal world. We see the phases of water: water vapor, liquid water and ice on Earth. We see the phases of matter in space: Pre-matter (Dark energy), electromagnetic field (Dark matter) and substance. The substance is immersed in the field environment. We "hear" the existence of the field environment whenever we bring a mobile phone to our ear.
Particles of substance are vortex condensations of an electromagnetic field. Rotating particles carry the adjacent field layer into rotation. The mass of the own field is equal to the mass of the particle. When particles are combined into fragments, their own layers are forced out. The flows of a vortex of its own electromagnetic field flow around an atom, a molecule, a stone, the Earth, the Sun, the Galaxy.
The environment of the electromagnetic field is the only source of gravity. Vortex flows near a material body create a pressure gradient of the environment (Bernoulli effect). Nature is simple and does nothing in vain. Nature achieves much with the help of the very small. Fundamental interactions initially have a single gravity mechanism based on the Bernoulli effect.
The dark matter of the Earth is the contents of the magnetosphere. Its mass is equal to the mass of the Earth. The dark matter of the Sun fills the heliosphere. Its mass is equal to the mass of the Sun. The dark matter of rotating sources rotates. But if in the galaxy there is an approximately equal number of right- and left-rotating stars, then the action of the flows is compensated.
Oliver Heaviside was the first to describe the analogy between electromagnetism and gravity (1893). He generalized Newton's theory to the case of time-dependent gravitational interactions. He introduced the gravimagnetic field created by moving masses. Oleg D. Jefimenko created a generalized theory of gravity by solving the Heaviside equations.
More in the book "Electromagnetic Gravity. Part 2" in my profile.