Astronomers call asteroids minor planets, and they call what are commonly know as planets, major planets.
The planets of our solar system (in increasing distance from the Sun) are
All of the planets in the solar system (except Earth) are named after [Roman god]?s. Moons and small planets are also named after gods.
Several [hypothetical planet]?s, like Planet X, were proposed.
In recent years several extrasolar planets were discovered. Some of them are not true planets but [free-floating planet]?s that don't orbit a star.