Planetesimals,asteroid-size objects,form during the early history of the solar nebula due to ________.
A)collisions of particles of ice,metal,and rocky material rotating about the protosun
B)vortices in the rotating disc associated with the protosun
C)the formation of comets in the outer parts of the solar nebula
D)the break-up of the solar nebula as it cools and contracts

Question

Quizplus · Accepted Answer

Planetesimals form through accretion, which is the process of collisions and sticking together of smaller particles. These smaller particles include ice, metal, and rocky material, which rotate around the protosun in the solar nebula. As they collide and stick together, they form planetesimals that eventually grow into planets. Vortices and comets are not directly involved in the formation of planetesimals. The break-up of the solar nebula is not a process that leads to the formation of planetesimals.

Planetesimals,asteroid-Size Objects,form During the Early History of the Solar Nebula