A celestial object is any natural body located outside of Earth's atmosphere. This includes a wide variety of entities such as stars, planets, moons, asteroids, and comets. These objects can be found in our solar system or in distant galaxies, and they play a crucial role in the study of astronomy. Celestial objects vary greatly in size, composition, and behavior. For example, stars are massive balls of gas that produce light and heat through nuclear fusion, while planets are smaller bodies that orbit stars. Understanding these objects helps scientists learn more about the universe and its origins.