Astronomy is the scientific study of stars, planets, galaxies, and other celestial objects. It is one of the oldest sciences, with its roots in ancient civilizations such as the Babylonians, Greeks, and Chinese. Astronomers use a variety of tools to observe and analyze the universe, including telescopes, satellites, and computers. Astronomy has helped us to understand the structure and evolution of the universe, and has provided us with insights into our own planet and its place in the cosmos.