The formation of terrestrial-type planets around a star is MOST likely to have occurred through what process?
A) accretion, or slow accumulation of smaller particles by mutual gravitational attraction
B) the breakup of a large disk of matter that formed around the star
C) the capture of objects traversing the depths of space by the star
D) the condensation of gas from the original star nebula

Question

Quizplus · Accepted Answer

The most widely accepted theory of planet formation is the process of accretion, where small particles clump together over time to form larger and larger bodies, eventually becoming planets. This process is thought to occur in the disc of gas and dust that surrounds a young star, known as a protoplanetary disc. The material in the disc begins to stick together due to mutual gravitational attraction, forming planetesimals that continue to grow into planets through collisions and gravitational interactions.

The Formation of Terrestrial-Type Planets Around a Star Is MOST