The Moon probably formed
A) out of a collision between Earth and a Mars-sized object.
B) when Earth's gravity captured a planetesimal.
C) when the accretion disk around Earth fragmented.
D) when planetesimals collided to form a more massive object.
E) when a piece of Earth broke off and entered orbit.

Question

Quizplus · Accepted Answer

The leading theory for the Moon's formation is the Giant Impact Hypothesis, which suggests that the Moon formed from the debris of a collision between the early Earth and a Mars-sized object.

The Moon Probably Formed