Theory of the Earth and the occurrence of the Solar System

Earth was formed billions of years ago, but the surface of the Earth has undergone many developments and changes in the process of all time. These changes are rapid or slow. The cause of these changes is the force of the earth (endogenous) and personnel from outside the Earth (exogenous).

Earth is part of the galaxy system in the universe, the Milky Way. Do you know what is called the galaxy? In the science of astronomy, galaxies defined as a system consisting of stars, gas and dust is very broad, in which members have the force of attraction (gravity). Earth that we live only a small fraction of the Milky Way, which is part of the solar system with the sun as its center.


Milky Way is not the only galaxy in this universe. The total number of galaxies that can be photographed with a diameter telescope at the Observatory 5m Hale possible until approximately one billion galaxies. These galaxies fill the universe.

1. The theory of Kant-Laplace Fog
Since pre-Christian era, the experts have a lot of thinking and doing an analysis of natural phenomena. Starting 18 th century scholars had thought about the process of the Earth.
Do you remember about the theory of fog (nebula) which advanced by Immanuel Kant (1755) and Piere de Laplace (1796)? They are famous for theory Kant-Laplace fog. In this theory proposed that the universe there is a gas which then assemble into mists (nebulae). Style of attraction between these gases form a set of huge fog and spin faster. In the process of very rapid rotation, the equatorial part of the material thrown off the fog parted and crushed (for cooling). Part of this was later thrown into the planets in the solar system.

2. Planetesimal
A century after the fog theory, appears Planetesimal advanced by Chamberlin and Moulton. This theory reveals that at first there was the origin of the sun. At one point, the origin of the sun was approached by a large star, which led to withdrawal in the sun. As a result of the withdrawal of solar energy from earlier, there explosions great. This burst of gas out of the atmosphere of the sun, then condenses and freezes as the objects solid, and called Planetesimal. Planetesimal in its development became the planets, and one of them is our planet.


Basically, the theoretical processes of the planets and the Earth, starting a gas daribenda a very hot temperature. Then, because the process time and velocity (rotation) speed, the cooling occurs that causes compression (on the outside). Earth Adapaun inner body temperature is still high.

3. Tidal Theory of Gases

This theory was put forward leh jeans and Jeffreys, namely that a large star near the sun in a short distance, thus causing the body tides on the sun, the sun was still in a state of gas. Occurrence tidal sea water that we know on Earth, ukuranya very small. The reason is the small mass of the moon and the distance of the moon to Earth (60 times the radius of Earth's orbit). However, if a star of mass almost as large as the sun approached the sun, it will form mountains like a giant wave on the body of the sun, which is caused by this star attractions. Mountain-guung high will reach incredible tongue and forming a huge incandescent, ran from the mass of the sun and stretched circumstances were angry that big star.


In this hot tongue occurs perapatan gases and eventually these columns will be split, then split into separate objects, ie planets. Big star that caused the withdrawal of the body parts of the sun earlier, went on in the universe, which will gradually lost influence on the shape-this planet. The planets will revolve around the sun and experience the cooling process. This cooling process is running low on large planets, like Jupiter and Saturn, while the small planets like our Earth, cooling running relatively quickly.


While cooling took place, the planets around the sun is still in elliptical orbits, so most likely at some point they will approach the sun in a short distance. As a result of the withdrawal force of the sun, there will be ups and downs in the bodies of the new planets were born. The sun will draw material columns of the planets, so was born the months (the satellites) that revolve around the planets. Sun held the role in shaping these months in principle the same as a big star role in shaping the planets, as has been discussed above.

4. Twin Stars Theory

This theory was put forward by an expert in astronomy RA Lyttleton. According to this theory, galaxies come from a combination of twin stars. One of the exploded star, so much material that was thrown. Since the exploding star has no gravitational force is still strong, the distribution of the fragments exploding stars around a star that did not explode. Stars that do not explode it is the sun, while the fraction of stars are planets surrounding it.




5. Big bang theory (the Big Bang Theory)
This theory is based on the assumption of the existence of a very large mass and has a very large density. The existence of the core reaction caused great amssa exploded. The mass is then expanded rapidly, away from the center of the explosion. Because of gravity, then the most powerful star will become the center of gravity.
Of the various theories put forward by experts, most scientists support the theory of big booms. According to them, the big bang is the beginning of the formation of the universe.