Question

When the solar system formed, planetesimals collided and merged to form

a. protoplanets
b. exosolar planets
c. planets
d. planetoids

Answer 1

(a)

Protoplanets are built up through the collisions of planetesimals over millions of years. The protoplanets orbit stably around the Sun for a while, but eventually they collide with each other. In about 100 million years, several terrestrial planets, like the ones found in our Solar System, are formed.

Answer 2

A. protoplanets

Step-by-step explanation:

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