Origin of Solar System

A widely accepted theory about the solar system formation nebularia hypothesis, which states that the solar system formed from the gravitational collapse of a huge giant cloud called the solar nebula.

A solar system is a set of celestial bodies, which includes a star with planets and other objects in orbit around it. Our solar system consists of orbits around the sun, which is 8 planets (including our earth, personal), and many other objects such as satellites (orbit planets), asteroids and meteorites. Different Solar System bodies like the sun, Moon, Mercury, Venus, Mars, Jupiter and Saturn are visible to the naked eye, the rest of the planets are visible through telescopes. There are also several bright asteroids, comets and meteors that are visible.

Sun is the largest member of the solar system because it provides the light, heat and other energy sources are vital for life. The eight known planets that orbit the Sun in orbits slightly oval in the first four planets: Mercury, Venus, Earth and Mars are rocky planets, the following four: Jupiter, Saturn, Uranus and Neptune are gas giants. Pluto was the ninth planet before, and as very small, scientists around the world collectively degraded. So, now no longer considered a planet.



Analyzing the radioactive decay of radioactive elements in meteorites, astronomers have said that the origin of the solar system can be traced to 4.6 billion years. It was the gravitational collapse of a small part of a giant molecular cloud appears. This is known as the "nebula hypothesis", which was first developed by Emanuel Swedenborg, Immanuel Kant and Pierre-Simon Laplace in the 18th century, a theory widely accepted worldwide. However, this theory has been challenged and refined, after the dawn of the space age and the discovery of extra-solar planets, between 1950 and 1990, respectively.

Under this nebulous theory, the solar system is formed by a huge rotating cloud of gas and dust called the solar nebula. It happened that the solar nebula began to collapse under its own gravitational force. Many scientists believe that the collapse of the giant gas cloud was caused by a supernova (Exploding Star), with her, which leads to contraction of the nebula. As the cloud collapses, causing heat to vaporize dust particles and causing compression of the cloud in the center.

As the nebula collapsed a large fragment broke off with him to form the solar system. The sun came out the biggest table in the center of the nebula. The pressure in the center of the nebula became great enough to trigger nuclear reactions that power the Sun could. As small nebula, which was faster and faster, but I put in a disc.Therefore, the total mass around the sun and forms a disk around it.

Moreover, particles in the flattened disk crashed each other several times, but I melted to form shaped asteroid objects known as planetesimals. Some of these planetesimals collided and more combine to form planets we know today. Remaining planetesimals combined to form satellites, meteors, comets and asteroids.

As solar flares, solar winds were created. They Northwest were so powerful in nature, which has eliminated most of light elements like helium and hydrogen in the solar system. However, these winds are weak in the solar system, and then the outer planets were left with large amounts of hydrogen and helium. This explains the nature of the gaseous outer planets and the nature of contrast four rocky inner planets.

Scientists believe that planets do not remain constant and continuous change. They believe that in the next 5 billion years the Sun's outer layers will expand, causing the Sun is the biggest and best. Extending the sun becomes a red ball of fire that consumes all the inner planets, including Earth. Scientists also believe that after a period of 100 million years, the Sun will lose the ability to make energy and end up as a small planet.

This hypothesis "nebula" is the most accepted theory of solar system formation. However, it is appropriate that the final theory of the cause of many theoretical problems which are causing problems in reconciling observations in November.