About outer space?

First of all, it is difficult for human beings to master the technical ability of sailing at sub-light speed (one tenth of the speed of light) in a short time.

Second, humans have not found a planet suitable for human habitation within 5 light years around the solar system, which means that even if humans master sub-light speed navigation in 30 years, they will not be able to reach the immigration destination in the next 50 years.

Third, it is difficult for human beings to solve the logistics supply problem of long voyage. Imagine how many life-sustaining substances will be consumed during the decades-long voyage.

Fourth, the long space flight will make people's mental breakdown.

In view of the above four points, it is unrealistic for you to reach another planet in your lifetime (100 years old).

P.S. About The Past of the Earth 1: Three-body and The Past of the Earth 2: Dark Forest may hurt your optimism about the universe, but I still recommend reading them. They are both rare books.

Add 2: Two Supplements to the Problem of Alien Civilization in Space;

1) Fermi paradox:

1950 One day, the Nobel Prize winner and physicist Fermi suddenly said, "Where are they?" This seemingly simple problem is the famous Fermi paradox. Theoretically speaking, human beings can fly to various planets in the Milky Way within 6.5438+0 million years. Then aliens should have come to earth as long as they evolved 654.38+0 million years before humans. In other words, "Fermi Paradox" shows such a logical paradox: A. Alien existence-scientific inference can prove that aliens evolved much earlier than humans, and they should have come to the earth and existed somewhere; B. aliens don't exist-so far, humans haven't found any clues about the existence of aliens.

2) the "dark forest" hypothesis:

Basic axiom

1, survival is the first need of civilization.

2. Civilization keeps growing, but the total amount of matter in the universe remains unchanged.

Doubt chain

One civilization cannot judge whether another civilization is good or evil.

One civilization cannot judge whether another civilization considers itself a good civilization or a bad civilization.

One civilization cannot judge whether another civilization will attack it.

One civilization cannot judge whether another civilization is kind or malicious to itself.

One civilization cannot judge whether another civilization thinks it is good or bad.

One civilization cannot judge whether another civilization is kind or malicious to her.

. . . . . . . . . . .

Technical explosion

The speed and acceleration of civilization progress are not necessarily the same, and a weak civilization is likely to surpass a strong civilization in a short time.

Law of dark forest

The universe is a dark forest, and every civilization is a hunter with a gun, sneaking around the forest like a ghost, gently pushing the branches in the way, trying not to make a sound, and even breathing must be careful: he must be careful, because there are hunters sneaking around like him in the forest. If he finds other life, he can only do one thing: shoot and destroy it. In this forest, others are hell and an eternal threat, and any life that exposes its existence will soon be destroyed. This is the picture of cosmic civilization, and this is the explanation of Fermi's paradox.

Plus 3: Regarding the issue of "The Past of the Earth 3", Liu said it was a "trade secret". ...