History of the Solar System

Definition of the Solar System

Solar System is a collection of celestial bodies composed of a star called the Sun and all the objects bound by gravity. The objects include eight planets known to orbit elliptical, five dwarf planets / dwarf, 173 natural satellites have been identified [b], and the millions of heavenly bodies (meteors, asteroids, comets) others.

Solar System is divided into the Sun, the inner four planets, the asteroid belt, four outer planets, and in the outer portion is the Kuiper belt and scattered disc. Oort cloud is estimated to lie in the farthest regions within about a thousand times beyond the outermost part.

Based on the distance from the Sun, the eight planets of the Solar System is Mercury (57.9 million km), Venus (108 million km), Earth (150 million km), Mars (228 million km), Jupiter (779 million km), Saturn (1430 million km), Uranus (2880 million km), and Neptune (4,500 million km). Since mid-2008, there are five celestial objects classified as dwarf planets. Orbit dwarf planets except Ceres, was farther than Neptune. It is the fifth dwarf planet Ceres (415 million km. In the asteroid belt; formerly classified as the fifth planet), Pluto (5906 million km.; Formerly classified as the ninth planet), Haumea (6450 million km), Makemake (6850 million km), and Eris (10 100 million km). Six of the eight planets and three of the five dwarf planets surrounded by natural satellites. Each planet outer planet is surrounded by a ring consisting of dust and other particles.

History of the Solar System

Five planets closest to the Sun than Earth (Mercury, Venus, Mars, Jupiter and Saturn) has been known since ancient times because they all can be seen with the naked eye. Many people in this world have their own names for each planet.

Developments in science and technology observations on five of the last century brought humans to understand the celestial bodies free from the veil of mythology. Galileo Galilei (1564-1642) with the telescope refraktornya able to make the human eye "sharper" in observing the celestial bodies can not be observed with the naked eye.

Since Galileo's telescope can observe more sharply, he could see many changes in the appearance of Venus, as Venus Venus crescent or full moon as a result of changes in the position of Venus to the Sun. Reasoning Venus around the Sun further strengthens the heliocentric theory, namely that the Sun is the center of the universe, not the Earth, which was previously initiated by the Nicolaus Copernicus (1473-1543). Heliocentric arrangement is the Sun surrounded by Mercury to Saturn. Galileo telescopes continue to be refined by other scientists such as Christian Huygens (1629-1695) who discovered Titan, Saturn's satellites, which were nearly 2 times the distance of Earth-Jupiter orbit.

The development of the telescope is also offset by the development of the motion computation of celestial objects and relationships with one another through Johannes Kepler (1571-1630) Kepler's Law. And the peak, Sir Isaac Newton (1642-1727) with the law of gravity. With two theoretical calculations that allow search and calculation of celestial objects further

In 1781, William Herschel (1738-1822) discovered Uranus. Careful calculation of the orbit of the planet Uranus concluded that there were disturbing. Neptune was discovered in August 1846. The discovery of Neptune was not enough to explain the interference orbit of Uranus. Later discovered Pluto in 1930. When Pluto was discovered, he was known as the only celestial object that was after Neptune. Then in 1978, Charon, Pluto satellites discovered, previously mistaken for the real planet because it does not differ much with Pluto.

The astronomers then found about 1,000 other small object that is located beyond the Neptune (called trans-Neptunian objects), which is also around the sun. There may be about 100,000 similar objects known as the Kuiper Belt Attraction (Kuiper Belt is part of the object-trans-Neptunian objects). Dozens of celestial bodies including the Kuiper Belt attractions Quaoar (1250 km in June 2002), Huya (750 km in March 2000), Sedna (1,800 km in March 2004), Orcus, Vesta, Pallas, Hygiea, Varuna, and 2003 EL61 (1,500 km in May 2004).

The discovery of 2003 EL61 is horrendous because of the Kuiper Belt is known attractions also have a satellite in January 2005, although smaller than Pluto. And the climax is the discovery of UB 313 (2700 miles in October 2003), named by the discoverer Xena. In addition to larger than Pluto, the object also has a satellite.