There is no black hole and only empty in the center of the spiral galaxy
According to classical physics of light wave theory and experimental demonstration, the wave propagation law and gravitational field not directly related; at the same time according to the presence of Intermolecular interaction force, infinite density material, there is no reliable theoretical and experimental support; the Schwarzschild "black hole" theory is established on the basis of the basic theory of error, the neutron star does not exist. The author also according to the basic principles of classical physics and basic experiments; at the same time, according to the different types of physical exercise, the law of their movement is similar, using the analogy method; it is demonstrated that in the center of the spiral galaxy there is no quality of infinity of stars and black hole. Astronomical observations show that center of the spiral galaxy is actually "empty".
Spiral galaxy; Empty; Black Hole; Ash Cave；Gravity；Gravitational field；Special Relativity ( SR ); General Relativity ( GR );The Schwarzschild radius; Intermolecular interaction force;