- the sun together with all the planets and other bodies that revolve around it.
- a similar system with celestial bodies revolving around a star other than the sun.
- the system containing the sun and the bodies held in its gravitational field, including the planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune), the dwarf planets (Eris, Pluto, and Ceres), the asteroids, and comets
