Large regular moons probably formed
A) when passing asteroids were captured by the gravitational field of their planet.
B) at the same time as their planets and grew by accretion.
C) after a collision between a planet and a large asteroid fractured off a piece of the planet.
D) after the period of heavy bombardment in the early Solar System.

Question

Quizplus · Accepted Answer

Large regular moons likely formed at the same time as their planets through the process of accretion, where smaller objects come together to form larger ones. This is supported by the fact that the compositions of many moons are similar to their host planets, suggesting they formed from the same material. The other options do not account for the similarities in composition or the formation of regular, rather than irregular, moons.

Large Regular Moons Probably Formed