Solar System Nebular Theory

Introduction to the Theory of Solar System Nebular:
The chiefly accepted theory of the evolution of solar system is known as nebular theory. The scientists Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace first developed the nebular theory in the 18th century. Please express your views of this topic Moment of Inertia Formulas by commenting on blog.


Nebular theory of solar system:


The nebular theory is the most generally accepted theory for the evolution of the solar system. Nebula is very huge a cloud of gases and dust particles.  According to this theory, the nebula begins to contract because of its own gravitational field. As the nebula begins to contract, it spins faster and flattens into the shape of a disk. The nebular theory shows that particles inside the flattened disk collide and stick together to form small-sized objects called plantesimals. Some of these planetesimals combine each other forms of planets. Other planetesimals from the disk form moons, asteroids and comets. All the planets and asteroids revolve around the sun in a particular manner. Most of the matter in the nebula is pull toward the center and forms the star. According to the theory, the pressure at the center is very high and leads to the nuclear fusion. Therefore, the source of Sun’s energy is nuclear fusion. In our solar system, the inner planets are small and made up of rocky materials and the outer planets, except Pluto, are huge sized balls made up of almost entirely of hydrogen and helium. Is this topic Definition of Longitudinal Wave hard for you? Watch out for my coming posts.


Formation of earth according to the nebular theory:


The gases in the form of a flat disc around the young sun condensed to form the small chunks of matter called planetesimals. In the beginning these planetesimals combine together to form the earth. The planetesimals which forms the earth comes from two regions.

(a)    The region occupied by the inner planets that means Mercury and Venus. The palnetesimals from this region mainly consists of the compounds of silicon, iron and magnesium.

(b)   The region occupied by the outer planets that means Jupiter, Saturn and Uranus. The palnetesimals from this region mainly consist of the compounds of hydrogen and carbon.

Therefore, the earth, which forms initially, was very cold. After a long time the earth undergoes the process of differentiation. Differentiation of earth means the earth settles in the form of layers according to the density of the material of earth. After differentiation, earth got the layered structure.