用英语简单概括(100字以内)下述文字：地球上生命的起源 没有人确切知道地球是怎样开始形成的
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No one knows how the earth began to form, because in the long long ago the earth was formed. However, a generally accepted theory is; The universe originated in a big bang, the big bang speak material onto them in all directions. Then, atoms to form and combine into stars and other celestial bodies.Billions of years after the big bang, but the earth is just a cloud of dust. Then he will become what no one can know, know money 38-3.5 billion, the cloud of dust slowly to form a solid ball. The earth became violent, don't know whether the solid shape will continue to exist. Violent explosion it erupted in fire and rock. Eventually produce carbon, nitrogen, water vapor and a variety of other gases, which formed the earth's atmosphere. More importantly, the earth cooled down, and the earth began to appear on the surface of water.

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