Eight elaborate solar system mystery (Photo).

<P Align=center> </ P> <P align=center> solar system </ P> <P> one mystery: how Mercury was born </ P> <P> solar system in which the nine planets Mercury, Venus, Earth, .Mars and Pluto, is the rock as the main ingredient of the "Earth-type planets"; Jupiter, Saturn, Uranus and Neptune, is surrounded by large amounts of gas, "Jupiter-type planets." .</ P> <P> closest planet to the sun is Mercury, which is how the birth of it? .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 iron and other metal-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. .</ P> <P> </ p>.