Outer Space Exploration Tour
Theoretically, it would be great if human beings could go to other planets to continue exploring after exploring the planets in the solar system. The ideal is beautiful after all, but the reality is cruel. Even the galaxy closest to the solar system is 4 light-years away from the earth.
Due to the limited technical conditions that humans currently have, there is no way to visit worlds outside the solar system. Based on the data and information currently obtained by scientific researchers, it is preliminarily judged that it is impossible for life to exist on the planets around the solar system.
Whether there are extraterrestrial civilizations in the universe
Even if there are other unknown civilizations in the universe, it is difficult for human beings to find them. First of all, everything in the world has a lifespan and development cycle, and so does the solar system.
Perhaps billions of years later, the solar system will gradually devour the surrounding planets, including the earth. Only after the previous generation of stars declare their extinction, will new life be born on this basis. The problem of life cycle is something that any intelligent civilization must face. Those extraterrestrial civilizations that once existed in the universe may have long been destroyed because of this difficult problem.
A question about the speed of light
The scope covered by the universe is really too large. In the face of the endless universe, any detection method adopted by human beings is meaningless. In the depths of the universe, if there are really many extraterrestrial civilizations, it must be because the two sides cannot master the technology beyond the speed of light, and are limited by the distance, there will never be any intersection, and they can only survive in their own small worlds . People don't know whether there is only human civilization in the vast universe.
