Planetary features refer to the distinct physical characteristics found on the surfaces of planets and moons. These can include mountains, valleys, craters, and plains, which are shaped by various geological processes such as volcanic activity, erosion, and impact from celestial objects. Each planet in our solar system has unique features that tell us about its history and composition. For example, the surface of Mars is marked by the largest volcano, Olympus Mons, and a vast canyon system called Valles Marineris. In contrast, Earth has diverse features like oceans, deserts, and mountain ranges, while Jupiter's moon Europa is known for its icy surface and potential subsurface ocean, suggesting the possibility of life.