IGNOU FST CHAPTER 11 Q1(Assignment 2017)

Q)Detailed account on the formation of the solar system
Ans)The theory of the formation of the solar system is based on the on the assumption that the Sun and all the planets were formed from a huge rotating cloud of interstellar gas and dust.For some reasons, the could started contracting. The contracting was hassled by its gravitational pull. The cloud contract. It also stated rotating faster and disc became disc shaped.More and more contracted towards the center of the disc and forming the star to be-the new Sun. The temperature of this star rose due to contraction until it started generating its own energy.Revolving around the Sun was a disc of gas and dust from which the planet condensed.In this revolving disc, the lighter elements were thrown towards the periphery and heavier elements concentrated inwards. As the Sun's energy increased, the gas shells around the inner planets were driven off and only cores of heavier elements in the cloud remained.The outer planets were less effected. Finally, the bright star's radiation removed the last of the system's free gases and a mixed array of planets remained. The smaller, solid ones were near the star and the much larger gaseous ones farther away. the earth was the third planet.