Question

27 which of these steps in the process of accretion occurs first? grains of dust collide with each other to form small bodies. planets end up as planetary systems with natural moons and satellites that orbit them due to gravity small bodies in space collide with other small bodies to form larger bodies. planets form through many collisions of larger bodies and clumping together.

Explanation:

The accretion process starts with the collision of dust grains to form small bodies. Then small bodies collide to form larger ones, and later planets form and may get moons. So the first step is dust grains colliding to make small bodies.

Answer:

The option "Grains of dust collide with each other to form small bodies." (the fourth option from the left, as per the visible selection)