The probable composition of Pluto and its large satellite, Charon, based on their average densities and location in the solar system (which determined their temperature when they formed), is:
A)almost entirely ice of one type or another.
B)about half rock and half ice.
C)mostly rock, with a relatively thin layer of water ice over it.
D)rock, with possibly a small, iron-rich core.

Question

Quizplus · Accepted Answer

Based on their average densities and location in the solar system, it is likely that Pluto and Charon are composed of about half rock and half ice. This is because the temperatures at their distance from the Sun were cold enough for water and other volatile substances to freeze, leading to the formation of a mixture of rock and various types of ice. Furthermore, recent observations by the New Horizons spacecraft support this hypothesis, as they reveal a mixture of water ice and rock-like materials on Pluto's surface.

The Probable Composition of Pluto and Its Large Satellite, Charon