Explanation of the star formation and protoplanetary disks?

Sajan sarthak

According to the nebular hypothesis all bodies in the solar system formed from an enormous cloud composed mostly of hydrogen and helium, with only a small percentage of heavier elements. As this huge accumulation of gas and dust revolved around its center, the Sun began to form as magnetic fields and turbulence worked with the force of gravity to concentrate particles. As the nebular matter that formed the Sun contracted, small amounts of it were left behind in eddies, which are similar to small whirlpools in a stream. The material in these eddies was the beginning of the protoplanets (proto original, * planetes* wanderer) and their orbiting satellites, which later consolidated into the present planets and their moons. During this early formation of the protoplanets and their satellites, the Sun condensed into such a hot, concentrated mass that forces within its interior began releasing energy through a process known as a fusion (fusus melted) reaction. >A fusion reaction occurs when temperatures reach tens of millions of degrees and hydrogen atoms combine to form helium atoms, releasing large amounts of energy. Not only does the Sun emit light, but it also emits ionized (electrically charged) particles that make up the solar wind. During the early stages of creation of the solar system, this solar wind blew away the nebular gas that remained from the formation of the planets and their satellites. wind blews all the vapour, Meanwhile, the protoplanets closest to the Sun (including Earth) were heated so intensely by solar radiation that their initial atmospheres (mostly hydrogen and helium) boiled away. In addition, the combination of ionized solar particles and internal warming of these protoplanets caused them to drastically shrink in size.As the protoplanets continued to contract, heat was produced deep within their cores from the spontaneous disintegration of atoms, called radioactivity (radio* ray, acti* to cause). The order and arrangement of the planets and other bodies in our solar system is due to the way the solar system formed. Nearest the Sun, only rocky material could withstand the heat when the solar system was young. For this reason, the first four planets-Mercury, Venus, Earth and Mars-are terrestrial planets. They're small with solid, rocky surfaces. Meanwhile, materials we are used to seeing as ice, liquid or gas settled in the outer regions of the young solar system. Gravity pulled these materials together, and that is where we find gas giants Jupiter and Saturn and ice giants Uranus and Neptune-(JOVIAN PLANETS)