･ The birth of the space ･･･ 10 billion years before
･ The birth of the solar system ･･･ 4,600 million years before
･ The first life birth in the earth ･･･ 3,500 million years before
･ The Homo sapiens birth ･･･ 300,000〜200,000 years before
The history of the human race is 1/10000 of the history in the earth only.
It was in the history in the earth variously from the red-hot times to the glacial age.
The mild time which was stable in it, the human race prospers only.
However the human race makes an effort for the natural environment preservation, in time, as for the earth, thinking that it becomes the environment which the person can not live in is natural.
･ The lifetime of the solar system ･･･ future, 5000000000 years
･ It thinks that it does the lifetime that the earth, too, is the same.
Before the lifetime of the solar system runs out, it is necessary to go out to the space.
However, in the more near place, the crisis of the human race extinction is stepping up in front of it.