A celestial body is any natural object found in space. This includes a wide range of entities such as planets, moons, stars, asteroids, and comets. These bodies can vary greatly in size, composition, and behavior, and they are part of the universe's vast structure. Celestial bodies are often studied in the field of astronomy, which helps us understand their formation, movement, and interactions. For example, the Earth is a celestial body that orbits the Sun, while the Moon is a natural satellite that orbits the Earth.