Formation of Planets

FORMATION OF PLANETS

 

Planets are gravitationally bound objects that orbit around the sun (star). The formation of planets depends on the formation of the sun (star) and a disc of gases and dust. These occur in the following stages.

STAGE 1: FORMATION OF SUN

The nebula contains lumps of gases known as stars (Sun). These lumps of gases formed due to the powerful gravitational force. It attracts the molecules of hydrogen into the center. These hydrogen atoms fused with each other and formed helium. Therefore, the sun is formed. The gas core (Sun) has an unmeasurable density and gravitational pull that develops a huge rotating disc of gas and dust around it.

STAGE 2: FORMATION OF PLANETESIMALS

The process of cohesion occurs because the dust around the sun contains carbon and iron. These elements have binding properties. Dust particles crash into one another to form a “clump”. These clumps accumulate and condense to form round objects. The clumping of objects makes the objects larger and larger in size. Thus, Dust becomes pebbles, pebbles become rocks, rocks become blocks, and these rocks blend and stick together with gases to form planetesimals.

NOTE- These building blocks of planets are known as planetesimals.

STAGE 3: FORMATION OF PLANETS

These small planetesimals come together to form large bodies called planets. The process of condensation helps in forming inner planets rocky and outer planets majorly in gaseous form.