Nature cosmology

Physical cosmology is the branch of physics and astrophysics that deals with the study of the physical origins and evolution of the universe.
It also includes ,the study of the nature of the universe on a large scale.
In its earliest form, it was what is now known as "celestial mechanics", the study of the heavens.

The CMB is one of the pillars of cosmologists’ understanding of the Universe.
By mapping subtle variations in the CMB across the sky, researchers have found compelling evidence for the ‘standard model of cosmology’.