A planet is a celestial body typically found in orbit around a star. Planets are typically spheroid and may have other bodies in orbit of themselves such as moons, rings or artificial satellites which can include communications or defense technology or orbital facilities such as starbases and shipyards. There are two basic types of planets, small solid rocky planets which may have a thin atmosphere and gas giants which are almost entirely atmosphere. Small planet-like bodies are planetoids or dwarf planets and smaller bodies still are asteroids.