Planets formed from left over from the formation of the sun at the center of the cloud

Disc-shaped cloud of gas and dust

Explanation:

The planets were formed from the clouds of dust particles and gases that resembles a disc. These particles were left over particles after the formation of the Sun. These gases and dust particles were attracted to one another due to the strong gravitational force, forming larger particles that orbits around the sun in a an elliptical path. This eventually led to the formation of planets.

The planets that are located close to the sun are generally comprised of rocky materials as the wind from the stars removed the gases from the surface of these planets and accumulated of heavier materials took place due to the strong gravitational force of the stars.

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