How horrible is the space environment?

For most people who have lived on the earth all their lives, the world is ever-changing and colorful. But for astronauts who have been in space, the earth seems a little lonely in space. If we put the earth in a larger universe, this loneliness will be more obvious.

As we all know, the first country to achieve manned landing on the moon was the United States. Americans gradually realized their dream of landing on the moon in the late 1960s, and after their first successful practice, they sent many astronauts into space one after another. According to the official data of NASA, a total of 12 astronauts successfully landed on the surface of the moon in the American Apollo program. They are also the only people in the population of more than 7 billion who have been to the moon so far, so only they have witnessed the true face of the moon surface. With the development of space exploration technology, people began to see some photos about the surface of the moon.

These photos are diametrically opposed to people's impression of the moon. Before seeing the true face of the moon, most people are wondering whether the moon will be a planet with mountains, water and rich colors like the earth. As a result, real pictures broke these beautiful ideas. There are craters and craters on the surface of the moon. There are no rivers, lakes and oceans at all, and there is no life of any kind. In fact, the first astronauts who landed on the moon knew this situation, and many scientists from NASA also knew this situation, but they still insisted on exploring the moon because they thought it was still worth exploring.

According to one of the American astronauts who landed on the moon, when he stood on the surface of the moon and looked at the earth, a blue planet floated alone in the universe. The earth and the moon are almost the two closest planets in the solar system, but their natural environments are quite different. At present, the earth is the only planet with life in the solar system, where there are rich landforms, abundant atmosphere and oceans that breed life. The moon is just a barren, gray planet, and the two are only representatives of "vitality" and "lifelessness".

Human beings are intelligent creatures with thoughts. When they see different things, they will have all kinds of emotions. Facing the earth, some people think it is lonely, but the existence of the moon makes it even more lonely. Perhaps other planets in the solar system are envious of the fact that the earth has evolved a natural environment suitable for life from billions of years ago and has remained so far. But in the view of the earth itself, it may be a "heterogeneous". No other planet can breed life, nor is it suitable for life, but it can carry such a rich life form.

Human scientists have long tried to find planets in the solar system similar to the earth's environment, but the results are not ideal. Except Europa and Titan, which are considered as a glimmer of hope, other planets are judged as "forbidden places for life" to varying degrees. If the earth's position in space is extended to galaxies outside the solar system, it is just one of countless planets. Judging from decades of human experience in exploring space, it is unlikely that life exists on exoplanets, which increases the loneliness of the earth.

Some people will say that we should think about the existence of the earth in the universe from another angle and should not be so pessimistic. Man is a creature that has only lived on the earth for millions of years from its appearance to now. Naturally, he doesn't understand the smallness and loneliness of the earth in the universe.