Million and billion years ago, who cares, to know that some things which can doing, how it is possible. But, firstly they need to know that, where live us. What is this.? But later, the scientist or experts research and found how to solar system formed. Some researchers have gives there theories such as Nebular hypothesis, Gases tidal theory, etc.
The Nebular hypothesis
The solar system formed nebular hypothesis was put forward by Kant, the German philosopher in 1755 and Laplace, the French mathematician in 1796. This hypothesis suggests that the sun and planets including the Earth have formed from a disc – shaped rotating nebula. A vast cloud of hot gas is called “nebula”.
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Originally, there was a large, hot, gaseous nebula which rotated along its axis. As the gas lost energy by radiation, it become cooler. As a result, the nebula contracted inward and its speed of rotation about its axis increased to conserve angular momentum. Due to this, the centrifugal force in the equatorial zone also increased there by causing the nebula to bulge out in equitorial zone.
The cooling and contraction of the nebula continued and. ultimately a stage came when the centrifugal force became greater than the gravitational attraction acting inward. As a result, a gaseous ring was separated out. The above process was repeated and successive rings of gaseous material were thrown off from the central mass.
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In the final stages, the rings condensed into planets. Planetoids were formed when one such ring broke into many small fragments. The central mass of the nebula continued to shrink. and finally, formed the Sun.
Gaseous Tidal Theory
The sun existed before the formation of planets. A large passing star approached very close to the sun. Due to the disruptive forces of the sun and the strong gravitational pull of the passing star, giant masses of gas were torn from the surface of the pre-existing sun. The giant masses of gas broke into a large number of small chunks which on cooling gave rise to solid particles, called “Planetesimals“. The planetesimals started flying as cold bodies into orbits around the sun in the plane of the passing star. By collision and gravitational attraction, the larger planetesimals swept up the smaller pieces and thus, Planets are formed.
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A very large star progressively approached close to the sun. Due to the gravitational pull of Star, a gaseous tide was raised on the surfaces on the sun. As a star came nearer, the tide increased size. When the star began to move away, the gaseous tide was detached from the sun. It’s shape was like a spindle being thickest in the middle. This spindle – shaped gaseous mass soon broke into ten pieces, nine of which condensed into planets and the remaining one which further, broke into small pieces, formed the group of “Planetoids”. Finally, the Solar System was formed.
The nebular hypothesis is about how to formed the solar system. In solar system, the formation of sun and planets. Planetoids is also combined in this. Solar system is the whole universe. In which, many small stars, planets and sun moon presented.