The term for someone who studies the stars and planets is an astronomer. Astronomers observe celestial objects and phenomena, seeking to understand the universe's structure, origins, and evolution. They utilize various tools, such as telescopes and satellites, to gather data and analyze astronomical events. Astronomers often specialize in branches like planetary science, astrophysics, or cosmology. Their work contributes to our knowledge of the cosmos, including the formation of stars, galaxies, and understanding concepts like black holes and the Big Bang theory.