Cosmology is the study of the origin, evolution, and structure of the universe in order to understand it.Researchers study how galaxies move, form, break apart, merge, and change over time. Beyond our galaxy lie countless others, and these are the focus of the discipline of extragalactic astronomy.Astronomers study the motion and evolution of the Milky Way in order to learn how galaxies are formed. It's a very complex system of stars, nebulae, and dust. Galactic astronomy focuses on the objects and processes at work in the Milky Way Galaxy.Astronomers observe these objects across all wavelengths and apply the information to create physical models of the stars. Stellar astronomy is the study of stars, including their creation, evolution, and deaths.They use both ground-based and space-based instruments to make nonstop studies of our star. The scientists who are interested in learning how it changes, and to understand how these changes affect the Earth, are called solar physicists.

Solar astronomy is the study of the Sun.One area is called planetary astronomy, and researchers in this subfield focus their studies on planets, both within and outside our solar system, as well as objects like asteroids and comets.

What is astronomy