Newton's law of gravity is a logical error of circular argument. Mass in the physical sense does not exist. Gravitational force is an electromagnetic force generated by induced-polarised charges on the surface of an object. Gravity follows the same laws as electromagnetism. Galaxies are a structure of matter, not a pattern of motion. There is no dark matter in galaxies. Galaxies are like magnetic monopoles and repel each other. There is no dark energy in the universe. Objects have only charge properties. There is only electromagnetism in the universe, and electromagnetism manifests itself only on the surfaces of objects. The universe is unified by the electromagnetic force.