What do astronomers generally believe about the origin of Mars' moons?
A) They formed with the planet out of the protoplanetary material.
B) They formed elsewhere and were captured at a later time.
C) They were ejected from Mars during its formation.
D) They were once a single moon and a later catastrophic event broke them in two.

Question

Quizplus · Accepted Answer

Astronomers generally believe that Mars' moons, Phobos and Deimos, are captured asteroids from the asteroid belt, due to their irregular shapes and composition that resemble carbonaceous asteroids.

What Do Astronomers Generally Believe About the Origin of Mars