The sun gets its energy when nuclei bas together continuously. However, each atom repels each other but because of the extremely high temperature it forces them together. When two hydrogen’s are pushed together they create helium. This process is called Nuclear Fusion.
The amount of red shift on a galaxy shows us how far they are moving away from us, for example the more red shift, the further away the galaxy is. In general, the further away a galaxy is, the faster it’s moving away from us. The motions of galaxies…