Which one of the following is not one of the four major features of the solar system?
A. Large bodies in the solar system have orderly motions.
B. Planets fall into two major categories (terrestrial and jovian).
C. Several exceptions to the general trends stand out.
D. Swarms of asteroids and comets populate the solar system.
E. The solar system contains eight planets plus dwarf planets (such as Ceres, Pluto, and Eris).
Answer: E) The solar system contains eight planets plus dwarf planets (such as Ceres, Pluto, and Eris).
Explanation: The precise number of planets is not thought to be of any particular significance, and the division between "planets" and "dwarf planets" is a recent classification scheme that does not affect the basic ideas in the four major features. That is, for the purposes of the four major features, the dwarf planets are considered to be equivalent to large asteroids or comets.
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