Masters degrees in Astronomy Theory involve the use of analytical models from the fields of Physics and Chemistry to describe astronomical objects and phenomena.
Related postgraduate specialisms include Observational Astrophysics. Entry requirements typically include an appropriate undergraduate degree such as Physics.
While other disciplines of Astronomy attempt to understand the whole of the universe (by and large), Astronomy Theory deals with the periodic motions of celestial objects. In other words, it explores aspects about the universe, without trying to predict the entirety of its contents.
Training typically involves a combination of analytical and computational techniques such as numerical simulations to model stellar and galactic formation and celestial mechanics. This includes building your understanding of processes such as nucleosynthesis, and the application of the Newtonian theory of gravitation to understand objects such as black holes.
Careers in this field are very diverse, with traditional roles including positions within national observatories and government facilities, including the civil service. Theoretical astronomers may also use their expertise in industry, including the development of medical equipment and advanced materials.