Whether or not a planet is composed mostly of rock or gas is set by:
A) its mass
B) its temperature
C) its distance from the star when it formed
D) a combination of all three of the above

Question

Quizplus · Accepted Answer

The composition of a planet is determined by a combination of its mass, temperature, and distance from the star when it formed. Mass determines the planet's gravitational pull, which in turn determines whether the planet can hold onto gases or if they will escape into space. Temperature also plays a role, as cooler temperatures allow for the formation of solid bodies, while hotter temperatures are more conducive to gas giants. Finally, distance from the star determines whether volatile materials like water and ice can condense and become part of the forming planet. Therefore, all three factors are important in determining a planet's composition.

Whether or Not a Planet Is Composed Mostly of Rock