You are probably going for the term cosmology, which is the study of the universe as it is now. This study includes all of the mass of the universe, but not in the sense of focusing on the study of individual things on the micro level. Cosmology can deals with theories of the development and possible end of the universe. The technical term for the study of the origins of the universe is cosmogony, although informally the term cosmology covers this as well.

Answer:

The universe is composed of matter and energy. Physics is the science of matter and energy and of interactions between the two, grouped in traditional fields such as acoustics, optics, mechanics, thermodynamics, and electromagnetism, as well as in modern extensions including atomic and nuclear physics, cryogenics, solid-state physics, particle physics, and plasma physics.

Astronomy, the study of celestial objects and the observable universe.

Another Perspective:

Cosmology, the study of the universe from its beginning to its projected end. While there is considerable overlap between the two, the difference lies in cosmology's interest and emphasis on causality and final disposition (fate) of the universe.