Eight solar system mystery.

One mystery: how Mercury was born. .The solar system formed by the nine planets. .Which Mercury, Venus, Earth, Mars and Pluto, are the main ingredients of rock "Earth-type planets"; Jupiter, Saturn, Uranus and Neptune, is surrounded by large amounts of gas, "Jupiter-type planets." .Mercury is the closest planet to the sun, how it is born? There are two versions: one, with Mercury closest to the sun, scientists believe that Mercury is in the original solar nebula in the high temperature region, the solidification of the metal iron and other rich .material deposited by the material substance. .Second, the original Mercury is the planet in a huge collision with each other when, by a combination of metallic iron of each other. .The second mystery: Why is Venus hot? .The size of Venus and Earth are closest to the internal structure of planets may also be similar. .However, according to radar detection of ships and, Venus is a burning of the world, like purgatory, the surface shrouded in a thick carbon dioxide atmosphere. .Surface temperature up to 450 degrees Celsius, is 30 times Earth's surface temperature. .As Venus near the sun, when solar energy increased, the Venus of gas released into the water to the atmosphere. .At this time, had dissolved in the sea but also accumulation of carbon dioxide in the atmosphere, causing a strong greenhouse effect, causing surface temperatures soared. .Mystery of three: the moon and farther away from Earth? .Moon from Earth is currently about 60 times Earth's radius. .However, due to tidal forces between Earth and Moon effect, the Moon at an annual rate of about 3 cm away from the Earth slowly. .On the other hand, the Earth's rotation gradually slows down the speed that the past is now closer to Earth than the moon, and Earth's rotation rate faster than it is now. .Scientists have found evidence in the "two Tony" fossil. .Two shell growth rate will change with the tides, while tree-ring growth of the same side of the formation of stripes, stripe width and number vary according to the size of the wet. .According to the number and width of these provisions, Section? </ P>.