I Want To Be An Astronomer! An astronomer is a person whose area of interest is astronomy or astrophysics. Astronomy is the scientific study of stars, planets, comets, and galaxies and occurrences that begin outside the Earth's atmosphere. It is concerned with the evolution, physics, chemistry, meteorology, and motion of celestial objects, as well as the formation and development of the universe. Astronomy is one of the oldest sciences.. Learn more about becoming an Astronomer and play a fun maze in today's What I Want To Be! Click HERE to download this activity as a printable PDF.