Astronomy , astrophysics and cosmology are three closely related fields of study . I will give two definitions of each of these fields to give a better idea of the relations , connections and differences between them . read more
The lines between astronomy, astrophysics, and cosmology are blurry. The simplest definitions of each field helps explain some distinctions. Astrophysics is the scientific field that uses laws of physics to explain the objects in our universe. read more
A big input to observational cosmology is the mapping of the CMB (cosmic microwave background) and also the galaxy-counts or redshift surveys, where they count how many galaxies there are at various distances to detect large scale undulations in the concentration of matter. read more