SOLAR SYSTEM

Detailed explanation-1: -Theia is a hypothesized ancient planet in the early Solar System that, according to the giant-impact hypothesis, collided with the early Earth around 4.5 billion years ago, with some of the resulting ejected debris gathering to form the Moon.

Detailed explanation-2: -In the solar nebula, dust and ice particles occasionally collided and merged. Through this accretion, these tiny particles formed larger bodies that eventually became planetesimals up to a few kilometers across. In the inner, hotter part of the nebula, planetesimals were composed of silicates and metals.

Detailed explanation-3: -Within the solar nebula, dust and ice particles embedded in the gas moved, occasionally colliding and merging. Through this process, called “accretion, ‘’ these microscopic particles formed larger bodies that eventually became planetesimals with sizes up to a few kilometers across.

Detailed explanation-4: -Over time the planetesimals continued to collide and join together, attracted by gravity. These larger objects, about the size and mass of our Moon, are called protoplanets.