A scientist who studies astronomy is called an "astronomer." Astronomers observe celestial objects such as stars, planets, galaxies, and phenomena like black holes and supernovae. They use telescopes and other instruments to gather data and analyze the universe's structure, origins, and evolution. This field encompasses various disciplines, including observational astronomy, theoretical astronomy, astrophysics, and cosmology. Astronomers contribute to advancing our understanding of the universe, often collaborating with physicists and engineers to solve complex questions about space and time.