GENERAL KNOWLEDGE

Detailed explanation-1: -Consolidations of these rocky planetesimals formed the four small, dense inner, or terrestrial, planets-Mercury, Venus, Earth, and Mars. Farther out, at the distance of Jupiter’s orbit and beyond, planetesimals with a different composition formed at temperatures where water and other volatiles could freeze.

Detailed explanation-2: -Planetesimals are rock-like formations. These are formed through the accretion of ice and dust particles. Even though planetesimals are made of ice and dust, eventually they combine with smaller planetesimals. Therefore, planetesimals are made of dust, ice, and small planetesimals.

Detailed explanation-3: -The nebular theory of planet formation suggests that the remaining material surround the newly ignited Sun would have accumulated into the planets. The accretion disk surrounding the Sun would have gravitationally accumulated into larger and larger bodies called planetesimals beginning some 4.5 billion years ago.