1. From Latin, literally meaning wanderer.
2. Anachronistic usage: a star that wanders, or moves, in the sky.
3. A world that orbits a star or other celestial object. Primary planets our solar system include Mercury, Venus,
Earth,
Mars, Jupiter, Saturn, Uranus, and Neptune. Secondary planets orbit primary planets.
Earth and Pluto are binary planets. Secondary planets are some times called minor planets, but minor planets also include planets that does not orbit other planets. Pluto'
s status as a major or minor planet is debated.