Asrophysics is the science that applies principles of physics to many fields of asrtonomy. It tries to determine the physical nature, origin, and development of the solar system, stars, gataxies, and the universe. The research is the study of cosmics rays.
Cosmology is the study of the structure, dynamics, and development of the universe.
Neutron Star-black dwarf contracts becomes more dense and loses PE g 7. As the galaxy comes closer to earth, the wavelenght gets shorter. As they get farther apart from earth, the wavelength becomes longer.