Planetary bodies are celestial objects that orbit stars, including planets, moons, asteroids, and comets. They vary in size, composition, and characteristics. For example, Earth is a rocky planet with a diverse atmosphere, while Jupiter is a gas giant with a thick atmosphere and many moons. These bodies can be classified into different categories. Planets are large enough to clear their orbits of debris, while dwarf planets, like Pluto, do not meet this criterion. Moons are natural satellites that orbit planets, and asteroids are smaller rocky bodies found mainly in the asteroid belt between Mars and Jupiter.