Solar System

The solar system is centered in the sun. It consists of a star and nine planets, and sixty three moors accompanying the planets. Moreover, it consists of meteoroids which are large chunks of iron and stones. There are also thousands of comets which are made up of dust, foreign gases and plasma, which is electrically charged gas.
The solar system was supposed to be a rotating disc of gas and dust. The planets and reg of the system were evolved from this rotating disc
The stars are stationary in the sky while the planets move and sometimes they are not even visible .These planets are Sun, Moon, Mercury, Venus, Mars, Saturn and Jupiter. There are three mere planets-Uranus, Neptune and Pluto. One important planet is earth.
These planets are divided into the inner planets and the outer planets. Among the inner planets, the are Mercury, Venus, Earth and Mars which are called terrestrial planets because of their rocky bodies The remaining planets are known as the outer planets. These outer planets are composed of sai elements as Hydrogen, Helium, Ammonia, Methane. The inner as well as the outer planets are in motion. When they move on their axis, it is known as rotation and when they go round the sun is large orbits, it is known as revolution.


Solar System
The Sun is one of the most important planets. It is a constant source of energy. It includes invisible ultra-violet, X-rays and gamma-rays, radio waves and plasma. It takes 250 million years to complete one revolution round the centre. This period is known as cosmic year.

The visible outer surface of the Sun is called photosphere. Above the Photosphere is the chromosphere. Beyond it is the grand and marvellous corona of the Sun which is visible during clipses. This is the hottest part of Sun, with temperature of about 2,700,000°C which is hot enough n emit X-rays. The Sun's rotation makes the solar wind travel in spirals and give it a magnetic field. The earth's own magnetic field protects it from the magnetic field of the solar winds, though sometimes they enter the atmosphere and cause aural displays.

The Moon is the only satellite of the Earth. It is the largest satellite in the Solar System. It has a diameter of 3475 kms while the diameter of the Earth is 12.700 kms. That is the reason why it has 1/6* the gravitation pull of the Earth. The Moon revolves around the Earth in an orbit. Its largest distance from the Earth is 406,000 kms and the least distance is 364,000 kms. The Moon has no atmosphere. There is no air on the Moon and consequently there is no sound because sound is a vibration transmitted through air. One more Example of an Abstract of a Technical Article is as follows.