The Earth and other planets in the solar system are believed to be had formed out of the solar nebula. Solar nebula was the disk shaped mass left over after the formation of Sun and still considered as the place of origin of new stars. It happened about 4.54 billion years ago. According to the science, the man evolved from the gorillas and chimpanzee. The first human like creature found in East African forests was called the hominid. Its scientific name is Homo habilis.