* Astrometry: the study of the position of objects in the sky and their changes of position. Defines the system of coordinates used and the kinematics of objects in our galaxy.
* Astrophysics: the study of physics of the universe, including the physical properties (luminosity, density, temperature, chemical composition) of astronomical objects.
* Cosmology: the study of the origin of the universe and its evolution. The study of cosmology is theoretical astrophysics at its largest scale.
* Galaxy formation and evolution: the study of the formation of the galaxies, and their evolution.
* Galactic astronomy: the study of the structure and components of our galaxy and of other galaxies.
* Extragalactic astronomy: the study of objects (mainly galaxies) outside our galaxy.
* Stellar astronomy: the study of the stars.
* Stellar evolution: the study of the evolution of stars from their formation to their end as a stellar remnant.
* Star formation: the study of the condition and processes that led to the formation of stars in the interior of gas clouds, and the process of formation itself.
* Planetary Sciences: the study of the planets of the Solar System.
* Astrobiology: the study of the advent and evolution of biological systems in the Universe.
Other disciplines that may be considered part of astronomy:
* Archaeoastronomy
* Astrochemistry
* Astrosociobiology
* Astrophilosophy
See the list of astronomical topics for a more exhaustive list of astronomy-related pages.
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