Here's a breakdown of what astronomy encompasses:

* Observing: Astronomers use telescopes and other instruments to gather light and other data from stars and other celestial objects.

* Analyzing: They then analyze this data to understand the physical properties of stars, such as their temperature, size, mass, composition, age, and evolution.

* Modeling: Using observations and physical laws, astronomers develop models to explain how stars form, evolve, and eventually die.

Astronomy is a vast and complex field that involves many different areas of study, including:

* Stellar physics: The study of the physical properties and processes of stars.

* Stellar evolution: The study of how stars change over time.

* Astrophysics: The study of the physical properties and processes of the universe as a whole.

* Cosmology: The study of the origin, structure, and evolution of the universe.

By studying stars, astronomers gain valuable insights into the history, structure, and evolution of the universe.